Impact of Micro Silica on the properties of High Volume Fly Ash Concrete (HVFA)

International Conference on Civil Engineering and Infrastructural Issues in Emerging Economies 2017

土木建筑工程;经济学

Sripragadeesh, R.^1 ; Ramakrishnan, K.^2 ; Pugazhmani, G.^3 ; Ramasundaram, S.^2 ; Muthu, D.^2 ; Venkatasubramanian, C.^2

Civil Engineering Department, TKR Engineering College, Hyderabad

500097, India^1

School of Civil Engineering, SASTRA University, Thanjavur

613401, India^2

Civil Engineering Department, Roever Engineering College, Perambalur, India^3

关键词: Engineering constructions;    Ground granulated blast furnace slag;    High volume fly ash;    High volume fly ash concrete;    Mechanical and durability properties;    Ordinary Portland cement;    Strength characteristics;    Supplementary cementitious material;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012009/pdf
DOI  :  10.1088/1755-1315/80/1/012009

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In the current situation, to overcome the difficulties of feasible construction, concrete made with various mixtures of Ordinary Portland Cement (OPC) and diverse mineral admixtures, is the wise choice for engineering construction. Mineral admixtures viz. Ground Granulated Blast Furnace Slag (GGBS), Meta kaolin (MK), Fly Ash (FA) and Silica Fume (SF) etc. are used as Supplementary Cementitious Materials (SCM) in binary and ternary blend cement system to enhance the mechanical and durability properties. Investigation on the effect of different replacement levels of OPC in M25 grade with FA + SF in ternary cement blend on the strength characteristics and beam behavior was studied. The OPC was partially replaced (by weight) with different combinations of SF (5%, 10%, 15%, 20% and 25%) and FA as 50% (High Volume Fly Ash - HVFA). The amount of FA addition is kept constant at 50% for all combinations. The compressive strength and tensile strength tests on cube and cylinder specimens, at 7 and 28 days were carried out. Based on the compressive strength results, optimum mix proportion was found out and flexural behaviour was studied for the optimum mix. It was found that all the mixes (FA + SF) showed improvement in compressive strength over that of the control mix and the mix with 50% FA + 10% SF has 20% increase over the control mix. The tensile strength was also increased over the control mix. Flexural behaviour also showed a significant improvement in the mix with FA and SF over the control mix.