Characteristic Strength And Durability Of Cement Addition With Admixture Materials

Abstract

There has been widespread use of supplementary cementitious materials as mineral admixture in concrete to enhance and modify its strength and durability characteristics. In the present work, an attempt has been made to assess the strength and durability properties of concrete made with rice husk ash, fly ash and nano-silica. The experimental investigation includes the determination of optimum dosage of superplasticizer, rice husk ash and nano-silica, compression strength test, non-destructive tests and test for obtaining chloride profile in concrete. On the basis of trial tests, concrete specimens are prepared from different mixes at w/b ratios 0.4, 0.45 and 0.50. Compressive strength test has been conducted at the ages of 28 days, 90 days and 120 days of curing for all the concrete mixes where as the non-destructive tests have been conducted at the age of 120 days. All the concrete mixes have been subjected to chloride solutions (external chloride exposure) with alternate wetting and drying cycles. Further the relationships between compressive strength and the non-destructive parameters namely rebound number and ultrasonic pulse velocity for different concrete mixes have also been obtained. Finally on the basis of observations from the results, relevant conclusions have been drawn. Keywords: Concrete; Rice husk ash; Nano silica; Fly ash; Compressive strength; Rebound hammer; USPV; Chloride ingress.