FORM OF TENDER

PROPOSED DEVELOPMENT OF RESIDENTIAL HOUSE ON PLOT LR. NO. NAI ROB

BLOCK 94/ 1B6, NYARI ESTATE, NAIROBI, FOR M/ SARUNABEN JAYENDRA

AND KARIA.

To Ms. Arunaben Jayendra and Jayendra B Karia,

I/We, the undersigned, am/are willing to contract for and complete the whole of the works

in full and per the drawings prepared by Dimensions Architects and Interior

Designers and Bills of Quantities prepared by Qbill Solutions Limited, Quantity Surveyors &

Building Economists, and to the Architect’s entire satisfaction for the sum stated within the

time stated below

AMOUNT OF TENDER KSHS

..LETM…2M.Miom..3ie.Jadecsel.ome.ASm.J2

…aG9.2e….

Hnarel.Dms…

TIME OF COMPLETI ON:

/We, the undersigned, undertake to complete the Contract works within…S..Weeks

from the Date of Possession

/We, the undersigned, undertake to commence the works within 14 days upon acceptance

of tender

LOMPATED AND ASCERTAINED DAMAGES

As Page 1/9 of the Bill of Quantities will be Kshs. 100,000/= per week or part thereof

wORK TO BE EXECUTED BY APPROVED SUB-CONTRACTORS

1/We, propose to employ the under mentioned Sutb-Contr ectora for the execution of works.

NAME OF SUB-CONTRACTOR

WORK TO BE EXECUTED

GtMERAL DsCRIPONS OE MARIAs A RRM

e fotow ovty to ofl Sercor i

MOLoNS AND ALRARO

uENERALAY

wve Contrector ts reaured fo visit the enlg bing d

crd no ecom arirg rom inck of knoege th spec wa te e

es ver irn frs section care cpa iote oid te Concr s i

oxact oure cind extenat of th arks

he Herns of putling dowws orf cteroticns cre to iictiate o o k

ieedling ord sirutfing and lemysorcry sworta in eren hert

pricihg for moing oood af worts detted in ofl trades d for cig at ots

The Contractor musf goe oll thm recesory nofices ad t ece de

nof coffapse lorge sectioris of wos Roo elc. ad ma paido o recesy shg p

Ihe dernolions

During demolition works fhe Contractor sholl keep he det cuslonly ated o m

rising ond his shof be incuded in }is prices

All rnaterials crisirng from ffhe demotfiors. undess specicoly stated olharwise

of fhe Contractor ond any credif ollowed for the value of such ootertc

provided

Al mafeiats, inctucding rubbish, shol be removed from the Site as soon as possae

The Contractor is to erect dtust proof screens lo fhe approval of he Architect wiere deered

and fo remove them on comple fion of the work, ofl to he Architecs sotistocon

INTERPRETATION OF TERMS

“Demollsh shall be deemed to mean cufting away breoking up. demolis hing puling do t g

removing. efc., as the confext requires ond shall include in ol coses lermporarily struttug pnd p

and making good remaining work as neces5ory, ond clearing awoy ond removing tom Salo ot dotsle

“Remove” shall mean taking down, hoacking up, breaking down, semoving elc and cleang ovay hon

and all other expenses ihereby ernfailed

“Make good’ shall be deemed fo mean ail making good iffing facing up, plastoring pgng reparng

and painfing to malch and joinling lo remaining existing work

To match” shall mean to be equal fo relevant existing work in design, workmonship and ol olher ropects

Re-fix’ shall apply to existing materials arising from the Works and shall mean toke from store ad fin pe

posilion, including making good, repairing and adjusting as neces5ary

UNDERPINNING

FOUNDATIONS

The following sequence of construction will be followed for any underpinining work io loundations

a) Excavate under foundation footing to a length of l000 mm by 500 mm wide by 500 ndeep

2000 mm cenfres,

b) Fill the excavated cavily wilh concrete mix I3.6
c) Allow the concrete to sef for two days.

Preambles: Demolitions & Alterations

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G) Repeat the above operation for the next panels unfil the whole foundalion is underpinned
e) Ereak off the projecfing foundation and leave Fiush with mass concrete surfoce

sUPPORT TO EXISTING SLAB

a) Prop up the first floor slab next to the wall to be demolished untl newwaling or column is bu

to cary universal beam.

b) Erect in posifion universal beam to support existing slab as designed.

c Remove props seven days affer erection of tihe beam.

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EXCAVATIONS

EXAMINE THE SITE

he Contractor is assumed to have exumined the Sile carefully und oscerlainnd for Himselt fs nauro T1

the kind of materiols to be excavated.

EXCAVATIONS

Excavations shall be lo the widths and depths Indicated on the Drawings or for such lesser or greater depth

Ohe ATehirect may deem necessary and so Instruct the Contractor n order lo obtain sclaeoy

Toundations.

Any diterence in the quarntity of work actually executed under such instructlons and hat provdod mo

s or Uanfifies shall be measured and valued by the Surveyor as a Varlcalion under he rolevant

Conditions of Contract.

however, the Contractor excavates to any greater depths or widihs than are shown on Ihe Drawings Or

directed. then the Contractor shall, at his own expense, salisfactorily fill in such extra depih and wi v

concrele similar to that described for foundalions.

BOTOMS OF EXCAVATIONS TO RECEIVE FOUNDATIONS

he Contractor shall report to the Architect when secure boltoms to the excavalions have been obtainad.

Any concrere or other work executed before the excavations have been inspected and approved sho, IT

SO directed. be removed and new work substituted after the excavalions have been Opproved, al ar ng

Contractors expense.

ine surtace of the bottoms to excavations to receive foundations shall be levelled or graded to tais as

required.

SIDES OF EXCAVATIONS

Sides of excavations shall be maintained vertical by means approved by the Architect, and the Contraclor

shall also allow for keeping the same free from fallen materials in his rates for excavalions.

ROCK

Excavafion in rock shall exclude all material that can be removed by hand and does not necessarily

require the use of compressors or other mechanical equipment allhough the Contractor mnay use such

equipment to loosen the material for ease of its removal. All topsoil, black colfon and other clay soils,

murram, stone and other fil and all sirnilar materials will NOT be classified as rock.

Rock has been measured hereafter as extra over excavation for excavating in soft or hard rock.

Soft rock shall be deemed to mean any material which cannot reasonably be removed without the use of

mechanical plant such as rippers, compressors, fraxcavators, but which does not require drilling, wedging

or blosting.

Local tuffs, magadi highly-consolidated loaterite, weathered lavas, boulders or outcrops of harder rock not

exceeding one cubic melre in volume, Narobi building stone and similar material shall be classified as soft

rock.

Hard rock sholl be clossified as material which is massive and geologically homogeneous and which

requres the use of driling, wedging or blasling for ifs removal such as blacktrap or similar materil

he Engineers decision shall be final wilh regard to Ihe clasificalion of excavated materials.

he Contractor shal afso allow for keeping excavations free rom, water and mud by baling. pumping or

oltfhenwise, in his rotes for excavations

Fsebes: Exeevations

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STARTING LEVEL

Unless otherwise described the starting level of all excavaions contractor’s measured prices should include for camyina

after complefion of reduced level excavation. However, the Contractor’s prices t he levelr.

Out the excavation work in any alternative sequence tnat he may require,

BLASTING

No blasting will be permitted without the prior approval of Local Authorities and the Architect.

CART AWAY

All surplus excavated materials where so directed and all rubbish are to be removed from the Site and the

Contractor is to find his own dump and shall pay al charges.

d the

BORROW PITS

No borow pits will be allowed fo be opened on the Site.

FILLING OBTAINED FROM THE EXCAVATIONS

Filing obtained from surplus excavated materials will only be incorporated if suitable materiol oricn

to be free from all weeds, roots, vegetable soil or other unstable materials and is to be filled in ayers each d is

of not more than 250 mm finished thickness. Each layer to be wel weted and consolidated as describ

ribed

hereafter.

HARDCORE FILLING

Hardcore for filing under floors, etc., shall be good hard stone ballast or quamy waste to the approval of

the Architect broken to pass nof greater than a l50 mm ingor to be /5% of the finished thickness of the

layers being compacted, whichever is the lesser. Hardcore shall be tree from all weeds, roots, vegetable

soil, clay, black cotton soil or other unstable materials.

It shall be well graded with smaller stones and fine matenals to give a dense compact mass after

consolidation. Sufficient fine material shall be added to each layer fo give gradation of material as

necessary to obtain a solid compact mass after rolling. Hardcore filling is to be laid in layers each of a

consolidated thickness not exceeding 250 mm. Each layer shall be compacted by at least 8 passes of a l0

fonne smooth- wheeled roller or a 2 tonne vibrating roller until all movement ceases.

Sufficient water is to be added to obtain maximum compaction to the Architecf’s approval. To each layer

a 25 mm thick layer of sand complying with the specitication for fine aggregate for concrete shall be

spread over Ihe surface and forced into the hardcore by the use of a vibrafing roller weighing not less

than 2 fonnes; this operation should be carried out when the materials are dry and repeated whilst the

sand is well watered. Should all the sand be absorbed the Architect may require a further layer to be

opplied and the process repeated.

The top surface of the hardcore shall be levelled or graded fo fals as required, and shall then be blinded

with a layer of similar material broken to 25 mm gauge and finished with a 10 fon smooth-wheeled roller.

The surface so oblained shall be to the Architecl’s approval.

MATERIALS FOUND IN EXCAVATIONS

Ho sand, aggregate, murram or ofher material found in the excoavations is to be used in the Works without

fhe writfen pemission of the Architect.

RATES FOR EXCAVATIONS

The rates for excavafion, including excgvation in rock, MUST INCLUDE for Irimming. levelling and prepaing

botloms and al faces lo receive concrefe, elc. and for any extra excavation required for planking and

strutfing

Prices shatl inctude for excavofing in any material encountered unless specifically otherwise described

handling.

Preambles: Excavations

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cONCRETE WORK

ARCHITECT/ENGINEER

For Ihe purposes of the concrete stnucture Ihe Structural Engineor, hereaffer teferred fo as the Engineer

shall be deemed invested with the dulies and be the representalive of the Archifect.

CODE OF PRACTICE

All workmnanship, materials, fests and perfomances in connection wilh the reinforced concrete work are to

be in conformity wifh the latest editionof the Brifish Standard Code of Practice (B.S. 8110 for The Structural

Use of Concrefe'”) where not inconsistent with these Preambles.

cONTRACTOR’S PLANT, EQUIPMENT AND CONSTRUCTION PROCEDURES

Not less than 30 days prior to the instalalion of the Contractors plant and equipment for processing.

handling, transporting, storing and proportioning ingredients. and for mixing, transporling and placing

concrete, the Contractor shall submit drawings for approval by the Engineer, showing proposed general

plant arrangemenis, fogether with a general descriplion of the equipment he proposes to use

After completion of insfallation, the operation of the plant and equipment shall be subjecl fo the approval

of the Engineer.

Where these Preambles, the Bills of Quantilies or the Drawings require specific procedures to be followed

SUch requirements are not fo be construed as prohibiting use by the Contractor of alfernafive procedures if

t can be demonstrated to the satisfaction of the Engineer that equal resulfs will be obtained by the use of

SUch altematives.

Approval of plant and equipment or their operation, or of any constructionprocedure, shall not operate foo

waive or modify any provision or requirements contained in these Preambles governing the quality of the

maferials or of the finished work.

Where sUspended floor slabs are to be constructed without expansion joints, concreting is to be in panels of

size and posifions fo the approval of the Engineer. To pemit seting shrinkages fo ocCur, some panels will be

left unconcreted until 7 days or more after main areas have been concreted. The Contractor must include

for this method of construction in his pricing.

SUPERVISION

The Contractor whose duty it will be fo supervise all stages in the preparation and placing of the concrete

shall employ a compefent person approved by the Engineer. All cubes shall be made and Site tests caried

out under his direct supervision, in consulfation with the Engineer.

TOLERANCES

On all sefting out dimensions of 5 mefres and over a maximum non- acCumulative folerance of pluS or

minus 5 millimetres will be allowed. On dll seffing out dimensions under 5 me tres a maximum

non-accumulative tolerance of plus or minus 3 milimefres will be allowed. On the cross- sectional

limensions of structural members, unless otherwise required by the Drawings. a maximum tolerance of plus

or minus 3 millimetres will be permitted.

The top surface of concrete floor slabs and beams shall be within 6 millimetres of ihe nomal level and line

shown on the Dravwings. Columns shall be truly plumb and non-accumulative tolerance of 3 millimetres in

each storey and not more than l5 millimetres oul of plumb in their full height will be permilted. The

Confractor shall be responsible for the cost of all corrective measures required by the Engineer to rectily

work fhat is not constructed wilthin the folerances set out above

MATERIALS GENERALLY

All materials which have been damaged, confaminafed or have deteriorated or do not comply in any way

wilh the requirements of these Preambles shall be rejected and shall be removed immediately from the Site

at fhe Contractors expense. No materials shall be stored or stacked on floors without the Engineer’s prior

approva

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Preambles: Concrete work

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Ratus for excavaliana centd

ate, of exiabu ofter excoValing o sn fandamR y R9Ra rvah

nlanking and stuiing ekcua wa ing y E fa s fl ey f B ide fie

ining sirdes and levaling a mng hoffa frandpig fap ei E9i fe e fe

embnkmanis and balters as feqiad

n his prices for ine ifem ‘Alow for kespig he whita of fin s n bas hem gl #s e f

shall allaw ndmake pravhion for keapng he wale al is Waks higg dy e R a1 wd

helow ihe lowesl laval

of any part of hem sa tong as mnay he requred nil comidaradnByey Ho AreGast sr iire say

clay ancd night hy paliol or hmdpumpi or olher Bchned CB s Eile na rrdds

SUmps, ihversions or any ouher merwi nBCany lar ihafuon Waler a Fn n eriF i

not he alowed to Run down the rondhanmels uil shal e GRnveyeil o ia reA GTE wy

itch or iver ihrough iroughs, hufes or pe

RATES FOR DISPOSA

Rates for cisposal of excavated maierial oe lo incha r ia soeotn af pl 9 es erel fr caf

cfouble handing and re eKGValio Irom poll heqps nG acAlly fifey is Arf f

DIOTHENE SHEETNG

Dlolhene sheeting shal he fi00 gouge or o00 gugo hoWM Gnd e GRanef i en ePva

manulaclurer Jolnts in sheeling shl he reile foldad wil h0 n fotnd opef in ifaroe

with 50 mm wide black ploslie dheslve lape from on Oved manulocer he shenng il t i8

stretched buf shol be laid loose wilih sufielanl wiinllas lapemll inkauG up l h

CUTING DoWN TREES

The Corntractor mUst consul he Arehiteetiatore eulg hO iEy eB Gr lennilerad

on the Sile

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The sources of supply for all materials Used for concrete work shall be opproved by the Engineer before

these materias are defvered on the Sife. All materiais shall comply with the requirements of fhe latest

approprigte Brifish Standard unless olherwise agreed with the Engineer, whose approval shall be obtained

in writirn

Thes suppliers of materials shall give the Engineer access to their prernises when directed for the purpose of

obfaining samples of the materiais for testing.

SAMPLES

Sarnples of materiats sholl be submtted as soon as possible after the Contract is let. No deliveries in bulk

shall be made until the Engineer approves the samples. All condemned materials shall be removed from

the Site wifhin 24 hours.

Every facility shall be provided to enable the Engineer to obtain samples and cary out tests on fhe

materials and construcfion. If these tests show that any of the materials or construcfion do not comply with

the requirements of this Specificafion, fhe Contractor will be responsible for the costs of the tests and the

replacement of defective maferials and/or construcfion.

Samples of all materials proposed to be used, shall be submitfed to the Engineer and shall be fested, where

required. by the Materials Branch of the Ministry of Works or other approved fesfing place, and receive his

opproval prior to being delivered in bulk upon the Works.

The Contractors attentlon is drawn to the faci that the testing of samples of aggregate, sand and cement

by the Materials Branch, M.O.W., takes time and it is of fhe utmost importance that the samples should be

submitted for tesfing as soon as possible afler ihe letfing of the Contract. The Ministry will not accept any

responsibility whatsoever for delay in fhe commencement of fthe Contract due fo delay on the part of the

Contractor in submitting samples.

CEMENT

Cement, unless otherwise specified, shall be Ordinary Portland Cement CEM 42.5 of a brand approved by

the Engineer and shall comply with the requirements of B.S. 12 with the exceptions that it may confain

reactive volcanic osh (of not more than 10% of the total weight) and fhe quanfity of insoluble residue

permitted in B.S. 12 may be exceeded. Amanufacturers Certificate of Test in accordance with B.S. 12 shall

be supplied for each consignment delivered fo the Site.

Should the Confractor require using cement of the rapid hardening variety, he should obtain the approval

of the Engineer ond dlso obfain any insfructions regarding modificafions to these Preambles caused

thereby. Any addifiondl cost that may be coUsed by the use of rapid hardening cement shall be at the

Confractors expense.

Cement may be delivered to fhe Sife either in bags or in bulk

f deliveredin bogs. each bog shall be properiy sealed and marked with the manufocturers name and on

fhe Site is fo be stored in weather-proof shed of adequate dimensions with a raised floor. Each

consignrment shall be kept separate and marked so that if may be USed in the sequence in which it is

received. Any bag found to contain cement that has set or partly set, should be completely discarded

and not used in the Works. Bags shal not be stored more than 1.500 mm in height.

af defvered in bulk the cemnent shall be stored in a weather-proof silo either provided by the cement

supplier or by fhe Coniractor, but in eifher case the silo shall be fo the approval of the Engineer.

AGGREGATES

The aggregates sholl conform to the requiremenis of B.S. 882 and the sources and types of all aggregate-

ore to be approved in all respects by the Engineer before work commences.

Presmbles: Concrete work

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Aggregtes cont’d

ding of aggregates shall be one within ine imaiS Ser our n B.s. 882 and as later specified and the

ading, once approved, shall be adhered fo throughout the Works and not varied without the anorou

val of

he Engineer. Fine aggregate shall be clean. coarse, stlnceous sand of good,. sharp, hard quality and shall

ha free from lumps of stone, earth, loam, dust. sat, organiC mafter and any other deleterious substances, It

shall be graded within the limits of Zone I or 2 of Table 2 of B.S. 882.

Coarse aggregate shall be good, hard, clean approved blacktrap or similar stone, free from dust.

decomposed stone, clay, earthy matter, foreign substances or friable fhin elongated or laminated pieces.

It shall be graded within the limits of Table I of B.S. 882 for its respective nominal size.

If in the opinion of the Engineer the cggregate meeis with the above requirements but is dirty or

adulterated in any manner it shall be screened and/or washed wilth clean water if he so directs at the

Contractor’s expense.

Aggregates shail be delivered to the Site in their prescribed sizes or grading and shal be stockpiled on

paved areas or boarded platforms in separate units to avoid intermixing. On no account shall aggregates

be stockpiled on fhe ground.

WATER

The water used for mixing concrete shall be from an approved source, clean, fresh and free from hamful

matter and comply with the requirements of B.S.31 48.

READY-MIXED CONCRETE

Ready-mixed concrete may only be used wilh the prior pemission of the Engineer, subject to special

addifional conditions laid down by the Engineer.

cONCRETE MIXES

Concrele mixes have been described either by the volume tric preoportions or by the 28-day cube strength.

cONCRETE STRENGTHS

Concrefe mixes shall have the following minimum strengths as given by Works Cube Tests:-

Minimum Crushing Strength at 28 Days

N/mm2

Class 30

32.5

Class 25

Closs 20

The average strengih obfained from cube tests shall be 10% higher than the minimum strengths shown

above.

Works Cube Tests will nof be required for Grade E blinding concre te which shall comprise 1:4:8 by volume

Valumetric mixes shall comprise the following:

Coarse Aggregate/CM

Fine Aggregate/CM

Cement/Kg

Mixes

0.07

0.03

1:1:2

0.10

0.05

1:1.5:3

O.14

0.07

1:2:4

0.20

:3:6

0.26

0.13

4:8

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MEASURED PROPORTIONS OF CONCRETE

Cement

uGntity of cement shall be measured by welgnt. wnere delivered in bags, each batch of concrete it

fo use one or more whole bags of cement.

Aggregates

Concrete aggregates shall be measured by weigni in d weigh-batching machine. Weigh batchinga

machines shall be of an approved type and shall be properiy maintained and checked for accuracy at

regular intervals.

CONCRETE CLASS 30,25 &20

The weights of fine and coarse aggregate fo be used in concrete classes 30 fo 20 shall be limited in

accordance with the fable below. Ihe Engineer shall first approve the proportions of fine lo coarse

aggregate and cement fhat the Confractor proposes fo Use for each of the mixes specified. The

Contractor will then be required fo prepare Preliminary Test Cubes and have these cubes tested as

described for Work Cube Tests. The fest results should be submitted to the Engineer in suficient time for

further tests to be camied ouf should they prove unsatisfactory. Cube strengths in the preliminary tests must

show crUshing strengths af least 25% higher than the strengths specified for Works Cube Tests. If the

Contractor is unable to produce specified cube strengths, he will be required af his own cost to increase

the cement content of the mix until satisfactory results are produced.

The Engineer may require at any fime during the Contract the proportions of fine to coarse aggregate fo

be alfered in order fo produce a mix of greater strength or improved workability and providing that the

tofal proportions of aggregate fo cement remain unchanged, no claim for additional cost will bee

Considered.

MINIMUM CEMENT cONTENT

Minimum Cement Content

by welght fo combined

total welghf of aggregate

Concrete Grade

Class 30

1 to 4.5

Class

I to 5.5

Class 20

1 to 7

WATERPROOF CONCRETE

Where waterproof concrete is specified, sealopruf Infegral Water- proofing Compound” and “Sealoplaz

Concrete Plasticiser’ as manufactured by Sealocrete Group Sales Ltd. Atlantic Works, Hyihe Road, London

NWIO 5RD, England, or ofher equal and approved supplier are to be added to the mixing water strictly in

accordance with the manufacturers instructions and at the rate of 0.50 lires and 0.25 litres respectively to

each 50 Kg. bag of cement to which the aggregates have aready been added and mixed. Not more

than 25 fitres of water per 50 Kg. bag of cement are to be used unless olherwise approved by the Engineer.

WATERPR0OFING APPLICATIONS

Where waterproofing producis are specified, the products shall be supplied and applied by an approved

Supplier who shall provide the necessary gUarantees and the producis shall be applied in strict

accordance with the manufacturers insfructions

EXPANSION JOINTING

Expansion joint filler shall be Flexcell as manufactured by Expandite Ltd.. or “Resilex’ as manufactured by

Evomasics LId., or other equal and approved

JOINT SEALER

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Preambles: Concrete work

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Seclers shall be eilher hot or cold appled Hol applied secln thes

shall be applied by gun and where more han 12 mm deede y w

within 2 mm from the outer face. A join seglens cae to be cot e perso

dms

WATERBAR

Water bar shall be PVC water bar as monfoctedby Exporte tt

provided ir

pante d o shr o0et

manufacturer’s instruc tions and where the woter br het wet e fea

by the supplier of 1he waler bo or ol other approved design stot tbe p et s es

from the reinforcement

Where waterproof concrete is used he

Contractor shall adhere sticy to Pe poon and toe

construchon joints as detailed on he Drowings. Any deviaion froms pocedre o n

odditional construction jolints wll requre the pror approwo of the Ergineer and any aidons er

so required will be at the Contractors expense

Formwork shall be designed with sufficient imber fomers and blocking pieces to supor he we be

and to ensure that if is not displayed during concreling

in the case of horizonfdl joints in vertical wolling ond simlar membes he fommeork hol be so cotcted

as to permit fhe starter or upstand of concrele sumOunding the lower hof ef the wotertar o e poued in

fhe same operafion as the slab or ofher concrete from which springr Faomot to w o r

members where he waterbar ib posilioned at the base af the t sholl hove sutcient operings no e h

300 mm square at approximately 200 mm above the level of the waterbor to pem checkrg ho he

waterbar is comectly posifioned and not disploced during concrelfing

No concreting will be pemnied fo porfions where upstand starters fomm an integro parf uni he fomw

to the starter has been fixed and approved

TESTING EQUIPMENT

The Contractor shall provide the following equipment for camying out control tests on the Sie

(a) Straight edges 3 metres and I metre long for tesling fhe accuracy of the firished ciorcrete

(b) A glass graduated cylinder for use in the silt test for organic impurifles in the sont

(d) Four 150 mm steel cube moulds with base plates and tamping rods to B.S 1881

WORKS CUBE TESTS

Works cubes are to be made at intervals as required by the Engineer in accordance with CP. 114.ond the

Contractor shall provide a continuouS record of the concrele work The cubes shaf be mode in aporoed

150 mm moulds in strict accordance wilth the Code of Practice.

Three cubes shall be made on each occasion.

Each cube shall be marked with a distinguishing number (numbers) to nun conseculivrely and the dte. and

a record shall be kept on Site giving the following particular

a) Cube No.

(b] Date made.

(d) 7-day Test:

Date

Strengih

(a) 28-day Test

Date

Strength

Preambles: Concrete work

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Works cubes test (cont’d)

Cubes shall be forwarded, camiage paid, tO an approved Tesling Authority, in tirme

days and the remaining one at the discrefion of the Engineer. No cube shall be dispatched witfnin 3 drzys

ime to be tested wo at

of casting.

Copies of all Works Cube Tests shall be forwarded fo the Engineer and one shall be retained on the Site

ctrenaths required above are not aitained, and maintained throughout the camying out of the

Contract, the Contractor will be requred to increase the proportion of cement and/or substitute better

agaregates so as fo give Concrere wnich does comply with the requirements of the Contract. The

Contractor may be required to remove and replace at his own cost any concrete that faits to attain the

required strength as ascertained by Works Cube Tests.

MIXING AND PLACING OF CONCRETE

The concrete shall be mixed only in approvedpower-driven mixers of a type and capacity suitable for the

work, and in any event not smaller than 0.40/0.28 cU.m. capacity.

The mixer shall be equipped with an accurafe water-measuring device. All materials shall be thoroughly

mixed dry before the water is added and the mixing of each baich shall continue for a period of not less

than two minutes after the water has been added and until there is a uniform distribution of fhe materiols

and the mass is unifom in colour.

The entire contents of the mixed drum shall be discharged before recharging. The volume of mixed

materials shall not exceed the rated capacity of the mixer. Whenever the mixer is started. 10% extra

cement shall be added fo the first batch and no extra payment will be made on this account.

AS a check on concrete Consistency slump tests may be carried out and shall be in accordance with B.S

The Contractor shall provide the necessary apparafus and camy ouf such fesfs as are required. Ihe

slump of the concrefe made with the specified water content, using dry materials, shall be detemined and

the water fo be added under wet conditions shall be so reduced as to give approximately the same slump.

The concrete shall be mixed as near fo the place where it is required as is practicable, and only as much as

is required for a specified section of the work shall be mixed af one fime, such sections being commenced

and finished in one operaion without delay. All concrete must be efficiently handled and used in fhe Works

within twenty (20) minutes of mixing. If shall be discharged from the mixer direct either into receptacles or

barows and shall be distributed by approved means that do not cause separation or othervise impair the

quality of the concrete. Approved

mechanical means of handling wil be encouraged, but the use of

chutes for placing concrete is subject fo prior approval of the Engineer.

Concrete shall be placed from a heighi not exceeding I,500 mm direcily into ifs permanent position and

shall not be worked along the shutfers to that posilion. Uniless ofherwise approved, concrete shal be

placed in a single operation to the ful thickness of slabs, beams, and similar members, and shall be placed

in horizontal layers not exceeding 1,500 mm deep in walls and similar members.

Concrefe in columns may be placed to a height of 4 metres with careful placing and vibration and

satisfactory resulis. Where fhe height of the column exceeds 4 metres suitable openings musf be left in the

shutters so that this maximum lift is not exceeded.

Concrete shall be placed confinuously until complefion of the part of the work between construction joints

FORM OF TENDER

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