25-08-2017, 09:32 PM
Abstracts: This project presents the effects of using Flyash (class F) and ultra-fine GGBFS (Alccofine) materials on Strength of High strength concrete with M60 grade of IS cube specimen. We are partially replacing Portland cement in Mix-1, by 26% Fly ash and 4 % Alccofine by weight of binder. Fly ash replacement varies from 26 % to 18 % and Alccofine replacement varies from 4 % to 12%. We are using PCE based super plasticizer for achieving workability of concrete. Dosage of super plasticizer is same for all mix proportions. Five types of concretes containing Fly ash and Alccofine with different proportions in addition to ordinary Portland cement concrete were investigated and tested for Compressive strength for ages of 7, 28 and 56 days. Three cubes of 150 mm size were tested on Compressive strength and the average was reported. Three beams of 150 x 150 x 700 mm size were tested on 28 days flexural strength and the average was reported. Three cylinder having Diameter 150 mm and height 300 mm tested for 28 and 56 days. The result shows that all the concretes achieve Compressive strength higher than 41 MPa that required for high strength concrete as per ACI 363. They also achieve target mean strength as per IS specification at 28 days. We also come to know that strength gain at 28 to 56 days was higher.