Experimental Studies on Concrete with Bentonite as Mineral Admixture

The present investigation deals with effect of bentonite clay on concrete. The concrete was produced by partial replacement of OPC with mineral admixture bentonite clay in percentages of 0%, 5%, 10%, 15% and 20%. The M20 grade of concrete was designed. The compressive strength, split tensile strength and flexural strength were found for the specimens. The present investigation is to study the effect of bentonite clay on concrete. The results indicate that the concrete with 5% Bentonite Clay replacement shows better performance when compared to other samples. The compressive strength, split tensile strength and flexural strength at 5% bentonite clay replacement and it was less for the remaining samples. KeywordsBentonite clay, flexural strength, compressive strength, split tensile strength etc. I. EXPERIMENTAL INVESTIGATION OF MATERIALS In this project 53 Grade KCP Cement is used. The following tests are conducted on Cement, experimental results are tabulated below. A. Test Results of Cement: Table – 1 Test Result of Cement S.No. Test Conducted Test Result 1 Fineness 3% 2 Consistency 28.5% 3 Initial Setting Time 55 min 4 Final Setting Time 5 hr 5 Specific gravity of cement 2.936 6 Compressive Strength 53 MPa According to the code IS 456-2000 provisions satisfying the permissible limits B. Test Results of Fine Aggregate: The fineness modulus of fine aggregates experimental results are tabulated given below, these results are satisfied the IS code provisions. Table – 2: Test Results of Fine Aggregate IS sieve size (mm) Weight retained (gm) Cumulative weight retained (gm) Cumulative % weight retained Cumulative % passing 4.75 2.98 2.98 0.298 99.70 2.36 4.77 7.75 0.775 99.225 1.18 22.10 29.81 2.981 97.019 0.6 83.69 113.54 11.354 88.646 0.3 817.00 930.54 93.054 6.946 0.15 56.56 987.10 98.71 1.290 Pan 17.40 999.50 99.95 0 Fineness modulus of Fine aggregate=307/100=3.07. With the help of above results the zone confirmation as per IS 383-1970 zone-III, this confirmation depends on the percentage passing of the materials. From the fineness modulus value also usefully for the nature of concrete property nothing but the higher fineness value results more amount of water is required for the mobility of the concrete. Experimental Studies on Concrete with Bentonite as Mineral Admixture (GRDJE/ Volume 1 / Issue 2 / 002) All rights reserved by www.grdjournals.com 8 C. Sieve Analysis of Coarse Aggregates: Table – 3: Sieve Analysis of Coarse Aggregates IS sieve size (mm) Weight retained (gm) Cumulative weight retained (gm) Cumulative % weight retained Cumulative % passing 80 0 0 0 100 40 0 0 0 100 2