The Effect of Accelerators and Mix Constituents on the High Early Strength Concrete Properties

V M Sounthararajan,A Sivakumar

doi:10.5402/2012/103534

V M Sounthararajan, A Sivakumar

Open Access

https://doi.org/10.5402/2012/103534

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Abstract

The present research study focused on the high early strength concrete properties that can be produced with large replacement of cement by fly ash. Also, the effects of adding fibres on the compressive strength gain and early age strength gain properties are determined. Tests were conducted on different high strength concrete specimens, where fly ash was substituted for cement up to 50%. Different types of concrete specimens were casted and tested for different fine-to-coarse aggregate ratio, metallic fibre content, cement-to-total-aggregate ratio, and accelerator dosage. The test results indicated that high early strength concrete (50.7 MPa at 7 days) was obtained for higher F/C ratio of 0.8, C/TA ratio of 0.24, and higher dosage level of steel fibre at 1.5%.

Highlights

High-early-strength-based cementitious materials are of vital importance for the present expanding civil infrastructure.the deterioration of civil infrastructure all over the world has led to the realization that cementitious materials must be improved in terms of their engineering property and durability
The same trend was observed for the controlled concrete mix, which resulted in marginal increase in the compressive strength for water-to-cement ratio (W/C)
It is well noted that higher fine-to-coarse-aggregate ratio (F/C) ratio used in concrete resulted in higher strength

Summary

Introduction

High-early-strength-based cementitious materials are of vital importance for the present expanding civil infrastructure. Steel-fiber-reinforced concrete is made for cement-based composite material reinforced with randomly distributed steel fibers diameter It contains pozzolans and admixtures commonly used in pavement construction in civil works [8]. In this similar area of research, it can be observed from earlier studies that the durability properties of concrete is not affected in the case of high early age strength gain in concrete [9]. Fibers conforming to ASTM A820-01 were used, end hooked steel fibers were used at dosage levels of 0.5 and 1.5% by volume fraction of concrete, the diameter of steel fibres was 0.5 mm, length was 30 mm and its aspect ratio (l/d) of 60, ultimate tensile strength was 900 MPa, and elastic modulus was 210 GPa. An accelerator was used to obtain a high early strength concrete at dosage level of 1% by weight of cement. 0.4, and fine-to-coarse-aggregate ratio (F/C) 0.6 and 0.8

Materials and Experimental Methods

Experimental Test Results and Discussions

Conclusions

54.9 MPa and a similar trend was noted for lower