Abstract
AbstractThis study investigated the impact of aggregate type on the volume changes including drying shrinkage, autogenous shrinkage, and swelling for mortars made with different w/b ratios. The main properties including compressive and flexural strengths were also studied. For this purpose, three groups of mixes were prepared: two of them were prepared with 0.2 and 0.3 w/b ratios which were classified as high-strength mortars, and for comparison, a one group of normal-strength mortars was prepared with a 0.5 w/c ratio. Each group consisted of three mixes made with natural sand (NS), limestone aggregate (LA), or recycled concrete aggregate (RCA). Within each group, the LA mixes generally showed the lowest drying shrinkage and autogenous shrinkage regardless of the w/b ratio, while the greatest ones were observed for RCA mortars. The results also indicated that the group of mixes of the 0.2 w/b ratio gave the highest autogenous shrinkage.
Highlights
The findings showed that the compressive strengths of both Series B and C mixes were affected by the type of fine aggregate
When the mixes of Series B were considered, which were made with silica fume (SF) and 0.2 w/b ratio, the greatest compressive strength was recorded for mortar mixes made with limestone aggregate (LA)
Analyzing the experimental findings of the present study led to the following concluding remarks: 1. The mixes in Series A which were produced with different fine aggregates and the w/c ratio of 0.5 showed comparable compressive strengths regardless of the testing age
Summary
The differences in strength between mortar and aggregate as well as the aggregate properties have an importance influence on the mechanism of crack growth (Neville, 1995). The research work by Ozturan and Cecen (1997) revealed that the concrete with ordinary strength gave comparable compressive strengths irrespective of aggregate type, while concrete of high strength gave different strengths such that the basalt aggregate gave the best strength and the gravel showed the lowest performance. The effects of three types of fine aggregates, namely natural sand (NS), limestone aggregate (LA), and waste concrete aggregates on the volume changes and strength behavior of 30–70 MPa mortars were investigated. The investigated volume changes were drying shrinkage, autogenous shrinkage, and expansion
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