CHECKLIST FOR READY MIX CONCRETE SUPPLY OF CONCRETE (RMC)

Transcription

1 Sl.Pg. 450 CHECKLIST FOR READY MIX CONCRETE SUPPLY OF CONCRETE (RMC) Name of Work : C.A. : Name of Contractor/Client : 1. Name of RMC manufacturer with plant address & telephone nos. 2. Name of Plant In Charge with qualification & Experience 3. Date of commissioning of RMC plant 4. RMC Plant details a) Capacity of plant Design Actual Output b) Whether plant fully automatic/semi automatic c) Conveyor belt for loading aggregate d) Aggregate bin with various compartments for different aggregate e) Mixer type f) of Transit Mixers with capacity g) of pumps h) of placer boom i) i) Separate silos with capacity for Cement ii) Fly ash j) Water storage arrangement

2 k) Plasticizer arrangement Sl.Pg. 451 l) Arrangement for alternate power supply m) Arrangement for maintenance of P & M. n) Storage capacity for raw materials o) Arrangement for curing tank & frequency of changing water p) Calibration frequency of plant with traceability q) Whether you observe the accuracy/sensitivity of measuring equipments within the limits of IS 4926:2003 r) Details of Calibration frequency of various testing equipments with traceability & its record 5. Quantity of RMC manufactured daily M20 M25 M30 M35 6. Source of materials Cement-whether bulk supply Coarse aggregate Fine aggregate Sand Crushed Sand Water

3 Sl.Pg. 452 Chemical Admixture Mineral Admixture (Fly ash) 7. Details of quality control testing & records of various constituents materials A) Cement (IS 8112, IS 12269) Whether MTC (weekwise) available Fineness Soundness IST & FST Consistency Compressive strength of cement mortar cubes-no. of cubes Chemical tests Physical & chemical testing at external lab. & its frequency B) Coarse Aggregate (IS 383 : 1970) Gradation Specific gravity Flakiness & elongation Index Impact value/crushing value/ Abrasion value Soundness Alkali Aggregate reactivity test

4 C) Fine aggregates (IS 383 : 1970) Sl.Pg. 453 Specific gravity Determination of clay, fine silts, & fines dust Free moisture content Soundness Water absorption Organic impurities D) Admixture (IS 9103 : 1999) Whether MTC is available for every batch & brand Dry Material content ph value Relative Density Compatibility Ash content Chloride ion content Performance test for slump retention & compressive strength test at 24hr. on control mix. Periodical testing at external lab. For crosscheck E) Fly ash (IS 3812 : 2003)

5 Sl.Pg. 454 Whether MTC available Physical properties 1. Specific surface 2. Residue on 45 micron IS sieve 3. Lime reactivity 4. Comp. Strength 5. Soundness Chemical properties chemical Analysis Periodical testing at external lab. For crosscheck F) Water (IS 456 : 2000, IS 3025 : 1964) ph value Sulphates Chlorides Organic matter Suspended matter Periodical testing at external lab. For crosscheck G) Concrete (RMC) a) Mix Design & Trial Mixes Method of design (whether as per IS or any other) b. Whether it is as per requirement of client or your own b) Daily check on preparation of starting slips for each of grades based on

6 Sl.Pg. 455 adjustments of moisture content or water absorption (at 7,11,15,19 hr.) as per schedule c) Analysis of fresh concrete Mix as per IS d) Temperature of the fresh Concrete Mix e) Slump at the Plant f) Check for Density for each grade g) Cube Comprehensive Strength & Acceptability Records of tests h) Permeability apparatus i) NDT equipments & co-relation with cube compressive strength j) Cement content test k) Chemical analysis of concrete samples l) Statistical analysis of test results & modification to the mix proportion based on standard deviation of plant m) Special Precautions taken a. During Rainy season b. During Hot season 8. Technical staff available at plant with qualification & experience 9. Technical Staff to accompany transit mixer with qualification & experience 10. Time of availability of RMC supply 11. Delivery tickets as per Annex G (Cl.9.4) of IS (Alongwith every load/transit mixer)

7 Sl.Pg Test frequency for all whether as per IS Any incidents of failure in quality supplied 14. Any incidents of failure in timely supply 15. Details of works where RMC used Major Clients 16. Any other information 17. Third Party Inspection Name of agency, Frequency & Report. 18. Monitoring of Ready mixed Concrete as per IS 4926:2003 a) If more than one admixture is used, confirmation of their compatibility b) IST & FST of concrete when admixture is used at adopted dosage (As per IS 8142) c) Time of transportation (Shall not exceed 2 hours for normal case.) d) Frequency of Compressive strength (One sample (3 specimens) for every 50 Cum or 50 batches whichever is greater).

8 Sl.Pg. 457 e) Any additional compliance criteria shall be declared to the producer by the purchaser prior to supply & shall be mutually agreed upon. f) The action to be taken in case of noncompliance shall be declared & mutually agreed upon. Also enclosed herewith Annex I i.e. Material Testing requirements as per IS 4926 : Signature of RMC Supplier M/s. Name Checked by