Abstract
In this study, the compressive strengths of concrete were investigated based on water content and aggregate volume fractions, comprising dune sand (DS), crushed sand (CS), and coarse aggregate (CA), for different ages. Experimental data were used to analyze the effects of the volume fraction changes of aggregates on the compressive strength. The compressive strength of concrete increases until the volumetric DS to fine aggregate (FA) ratio (DS/FA ratio) reaches 20%, after which it decreases. The relationship between changes in compressive strength and aggregate volume fractions was analyzed considering the effect factor of each aggregate on the compressive strength and at 2 conditions: (1) 0 < DS < CS < CA and (2) 0 < CA < CS < DS. For condition (1), when the effect factor of CA = 1, those of DS and CS were within 0.04–0.83 and 0.72–0.92, respectively, for all mixtures. For condition (2), when the effect factor of DS = 1, those of CS and CA were within 0.68–0.80 and 0.02–0.79, respectively.
Highlights
Daewoo Institute of Construction Technology, DAEWOO E&C, Seoul 04548, Korea; Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea
For a constant dune sand (DS) replacement ratio, the AD content required to attain the required slump increased as the water content decreased
The effect of each aggregate on the compressive strength of concrete was quantitatively analyzed based on the measured data
Summary
To optimize the basic properties of concrete, including workability and strength, significant attention needs to be paid to the proportions of aggregates used in the concrete mix. Unlike CS, DS is composed of relatively small particles with spherical shapes [1] Due to these properties, if only CS is used for concrete production, the workability of the resulting concrete is considerably low, which makes it quite difficult to perform pumping and compaction when the concrete is used in construction. If only CS is used for concrete production, the workability of the resulting concrete is considerably low, which makes it quite difficult to perform pumping and compaction when the concrete is used in construction Mixing these two types of FAs could effectively improve the workability of concrete because each FA could compensate for the drawbacks of the other. Al-Harthy et al [3] reported that when DS and CS were used together as FAs, the Academic Editor: Giuseppe Lacidogna
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