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SCC Mix Design.pptx
- 1. Mix Design for Self Compacting Concrete
- 2. Data for Mix Proportioning a) Grade designation; b) Type of cement, and grade of cement (if applicable); c) Maximum nominal size of aggregate; d) Minimum cement/cementitious materials content and maximum water-cement/ cementitious materials ratio to be adopted; or Exposure conditions as per Table 3 and Table 5 of IS 456; e) Characteristics of SCC 1. Filling Ability - Slump Flow Class 2. Passing ability by L box test 3. Viscosity by V- Funnel flow time 4. Stability by Sieve segregation resistance f) Transportation time; g) Degree of site control (good/fair) or value of established standard deviation, if any; h) Type of coarse aggregate (angular/sub angular/gravel with some crushed particles/rounded gravel/manufactured coarse aggregate); j) Type of fine aggregate (natural sand/ crushed stone or gravel sand/manufactured sand/ mixed sand); k) Maximum cement content; l) Whether a chemical admixture shall or shall not be used and the type of chemical admixture and extent of use; m)Whether a mineral admixture shall or shall not be used and the type of mineral admixture and extent of use; n) Any other specific requirement like early age strength requirements.
- 3. Mix Design Example Carry out the mix proportion for SCC of M30 grade with the following stipulations. Data/ Stipulations: a) Grade designation : M 30 b) Type of cement : OPC 43 grade conforming to IS 269 c) Nominal Maximum nominal size of aggregate : 20 mm d) Exposure conditions as per Table 3 & 5 of IS 456 : Severe (for reinforced concrete) e) Characteristics of SCC 1. Slump Flow Class: SF3 (slump flow 760 mm – 850 mm) 2. Passing ability by L box test : Ratio of h2/h1 = 0.9 3. V- Funnel flow time (Viscosity) : Class V1 (flow time ≤ 8s) 4. Sieve segregation resistance : SR2(<15percent) f) Degree of site control : Good g) Type of aggregate : Crushed angular aggregate h) Chemical admixture type : 1. Superplasticizer: Normal (PCE type) i) Mineral admixture : Fly ash conforming to IS 3812 (Part 1)
- 4. Material Test Data: a) Cement used : OPC 43 Grade conforming to IS 269 b) Specific gravity of cement : 3.15 and Specific Gravity of Fly ash : 2.2 c) Specific gravity: 1) Coarse aggregate (at SSD condition) : 2.74 2) Fine aggregate (at SSD condition) : 2.65 3) Chemical admixture : 1.08 d) Water absorption 1) Coarse aggregate : 0.5 % 2) Fine aggregate : 1.0 % e) Moisture content 1) Coarse aggregate : Nil 2) Fine aggregate : Nil f) Sieve Analysis (materials less than 0.125 mm is 8 percent, based on sieve analysis of Fine Aggregate)