The IUP Journal of Structural Engineering
An Experimental Study on the Strength Properties of Standard Concrete by Partial Replacement of Cement with Calcium Bentonite and Alccofine

Article Details
Pub. Date : Oct, 2020
Product Name : The IUP Journal of Structural Engineering
Product Type : Article
Product Code : IJSE41020
Author Name : M Vijaya Sekhar Reddy, P Divakar
Availability : YES
Subject/Domain : Science and Technology
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No. of Pages : 9

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Abstract

Large amount of carbon dioxide is released in the environment during cement production, resulting in global warming. There is a need to alter the cement by some natural resources having pozzolonic properties. Calcium bentonite powder is a naturally available material having pozzolonic properties able to replace cement partially. The contribution of mineral admixture alccofine to concrete reduces thermal, shrinkage cracks and increases strength as compared to conventional concrete. Alccofine boosts the compressive strength of concrete. The paper proposes that cement be replaced with calcium bentonite (5%, 7.5%, 10% and 12.5%) and alccofine (5%, 7.5%, 10% and 12.5%), respectively. Varaplast SP-123 (superplasticizer) is used for good workability with the concrete, and it is taken by the weight of cementitious material. Cubes and cylinders were cast in accordance with M30 design mix, and compressive strength and split tensile strength were evaluated for 7 days and 28 days curing period; workability tests (slump cone) were conducted and compared with conventional concrete, and based on the test results, various strengths were identified.


Description

The construction industry has taken considerable strides forward over the last two to three decades with regard to trials in the use of one or another cementitious materials generally identified as pozzolans for compounding various cement-based products. This has resulted not only in improving the compressive strength value attained but also in qualities like ability to set and harden under water. Among them, coal fly ash, blast furnace slag, rice husk ash, silica fume or metakaolin are the most common ones. Others like gypsum, gypsum fines, Portland cement, cement kiln dust, lime dust, stone dust and calcined clay are also in use.


Keywords

Calcium bentonite, Alccofine, Compressive strength, Conventional concrete, Superplasticizer

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