EFFECT OF LIMESTONE CRUSHER DUST CONTENT ON SOME PROPERTIES OF STEEL FIBER REINFORCED CONCRETE

Abstract

Limestone crusher dust is used as filler material for cement or concrete depending on the chemical composition. This dust is composed of particles which pass 75 mm BS sieve.

The influence of limestone crusher dust content in aggregate on the properties of steel fiber reinforced concrete (SFRC) is not known very well yet.

In order to analyze the change in the properties of SFRC, some laboratory tests have been undertaken. During these studies, crusher dust partially replaced the aggregates at percentages of 0, 10, 15, 20 by weight and three different types of hooked-end steel fibers having aspect ratios of 65, 80, and 100 and three different volume percentages of steel fibers as 0.5, 1.0, and 1.5% were used.

Tests of VeBe consistometer, air content, wet density, linear shrinkage, compressive strength, Ultrasonic pulse velocity and Schmidth hammer have been conducted.

The addition of crusher dust to fresh SFRC increased the VeBe time and wet density; however, it reduced the air content. Improvement in compressive strength and reduction in linear shrinkage with the addition of fibers is also noted.

Replacement of dust with fine aggregate reduced the workability and air content but increased the wet density. Optimum dust content was found to be 10% for the compressive strength. Linear shrinkage remained almost the same up to 15% dust replacement but beyond that limit it tended to increase.