Checklist for Ready Mix Concrete Certification

1 Checklistfor Ready MixConcreteCertificationClauseNo.(IS 4926:2003)Clause/CriteriaCompliedNotComp liedNotApplicableRemarks(R) Cementsused for Concrete shall conform to therequirements of relevant Indian Standardsand requirements of IS and grade of cements used since last audit shall be Admixtures MineralAdmixturesshall Conform to IS of mineraladmixturesused shall be reported since last Aggregates used for Concrete shall be in accordancewith the requirements of IS of coarse and fine aggregateused shall be reported since last otherwise agreed testing frequencies for aggregates shall be asgiven in Annex AdmixturesChemical admixtures shall be as perIS chemicaladmixturesused shall be reported since last materials are used which are not

2 Covered by the provisions ofthe relevant Indian Standard, thereshould be satisfactory data on theirsuitability and assurance of quality and details of performance of such materials should bemaintained. Account should be taken of possible interactions andcompatibility between materials used. Also, prior permission of thepurchaser shall beobtained before use of such Water used shall be in accordance with therequirementsofIS source of water to be agreed, theminimumtesting frequencies for water shall be asgivenbelow:a)Mains Water Water samples are taken from all sources of supplyand tested for pH, chloride ion content, sulfate content and any otherparameters in accordance with IS 456.

3 The initial test rate shall beweekly until six results are obtained. Three monthly samples shall thenbe taken and compared against the average of the original deviation shall require further )Non mains Water Asample shall be takenannually forroutine records however if theChlorideion content is above percent then the interval of testingshall be reduced to 3 The use of re-cycled water is encouraged as long as Concrete ofsatisfactory performance can be produced and stepsare taken tomonitor the buildup of chlorides in any recirculated water and that anysubsequent adjustments to the mix design are made to ensure that anyoverall limit on chloride contents is satisfied.

4 The addition of anyrecycled water shall be monitoredand controlled to meet percentage of recycled water used and compliance tochloride content to be The total amount of water added to the mix shall be recorded inthe production record. The water content of Concrete shall be regulatedClauseNo.(IS 4926:2003)Clause/CriteriaCompliedNotComp liedNotApplicableRemarks(R)by controlling its workability or by measuring and adjusting the moisturecontents of its constituent materials. The producer s production staffand truck-mixer drivers shall be made aware of the appropriateresponses to variations in Concrete consistence of a particular mixcaused by normal variations in aggregate moisture content or and traceability of each raw material shall.

5 1) Ifnecessary, the water may be treated suitably toensure itscompliance with the requirements of IS and and Storage and CementSeparate storage for different types and grades of cement shall may be used to store cements of different types providedthese are emptied before loading or silos shall be weatherproof and permit free flow and efficientdischarge of the silo or compartment of a silo shall be completely separate andfitted with a filter or alternative method of dust filter or dust control system shall be of sufficient size to allowdelivery of cement to be maintained at a specified pressure, and shallbe properly maintained to prevent undue emission of cement dust andprevent interference with weighing accuracy bybuildupof be stored and stacked in bags and shall be kept free fromthe possibility of any dampness or moisture coming in contact with themand where cement can be stored and retrieved without undue damageto the boards shall be displayed indicating different types of cements andbest before use cement is to be used in the order it is delivered (See also IS 4082).

6 In case, the cement remains in storage for more than 3 months, thecement shall be retested before use and shall be rejected ifit fails toconform to any of the requirements given in the relevant pulverized fuel ash and other mineral admixturesSuitable separate arrangement for storage of pulverized fuel ash, silicafume, metakeolin, ricehusk ash, ground granulated blast furnace slagsuch as for cement, shall be provided, in the plants utilizing shall be dedicated silos for pulverized fuel ash and for groundgranulated blast furnace the silos shall be labeled and the records of storage of differenttypes/grades of cement or different types ofmineraladmixtures, shallbe (coarse and fine)ClauseNo.

7 (IS 4926:2003)Clause/CriteriaCompliedNotComp liedNotApplicableRemarks(R)Stockpiles shall be free draining and arranged toavoid contaminationand to prevent intermingling with adjacent bin shouldhave hard floor to avoid contamination with the soil/water. The travelarea for the vehicles for handling of aggregates should also be having ahard base to avoid contamination during procedures for loading and unloading aggregates shall besuch as to reduce segregation to a shall be made for separate storage for each nominal size andtype of aggregate and the method ofloading of storage bins shall besuch as to prevent intermingling of different sizes and aggregate shall be stacked in a place where loss due to the effectof wind is minimum (See also IS 4082 and IS 456).

8 The aggregatesmay be kept covered to avoid loss or coarse aggregates, water may be sprinkled to avoid mixing and lossdue to effect of : 1) Incase the conveyance system is used it shall be designed insuch a way that the material being conveyed is adequately protectedagainst adequate supply shall be provided and when stored on the plantsuch storagefacilities shall be designed to minimize the risks ofcontaminationThe water tank may be cleaned regularly to avoid the deposition of anysediments, algae formationor foreign admixturesTanks or drums containingliquid admixtures shall be clearly Iabelled foridentification purposeand shelf lifeshall be clearly indicated.

9 They shallbestored in such a way to avoid damage, contamination or the effectsof prolonged exposure to sunlight (if applicable). should be stored in a manner that preventsdegradation of the product and consumed within the time periodindicated by the admixture supplier. Any vessel containing anadmixture in the plant or taken to site by the producer shall beclearly marked as to its When offering or delivering a mix to a purchaser it should beindicated if such a mix contains an admixture or combination ofadmixtures or not. The admixtures may be identified genericallyand should be declared on the The amount of admixture added to a mix shall be recorded in theproduction record.

10 In special circumstances, if necessary,additional dose of admixture may be added at project site toregain the workability of Concrete with the mutual agreementbetween the producer and the shall be provided for liquid admixtures, which are not Plants and Batching EquipmentClauseNo.(IS 4926:2003)Clause/CriteriaCompliedNotComp liedNotApplicableRemarks(R)Hoppers for weighing cement, mineral admixtures, aggregates andwater and chemical admixture (if measured by mass) shall consist ofsuitable containers freely suspended from a scale or other suitable loadmeasuring device and equipped with a suitable discharging method of control of the loading mechanism shall be such that, asthe quantity required in the weighing hopper is approached, the materialmay be added at a controllable rate and shut off precisely within theweighing tolerances specified inAnnex weighing hoppers for cement,mineral admixtures aggregate shallbe capable of receiving their rated load, without the weighed materialcoming into contact with the loading the rated capacity of a batching plant mixing cycle is less m3.