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|Title:||Factors influencing the mechanical properties of lightweight aggregate concrete|
|Keywords:||Lightweight aggregate concrete;Mechanical properties;Mixture proportions;Influence factors;Compressive strength|
|Abstract:||This paper presents an experimental study evaluating the mechanical properties, particularly the compressive strength, tensile strength, bulk density and elastic modulus, of lightweight concrete with three types of aggregates, i.e., expanded clay, sintered fly ash and expanded shale. The effects of aggregate types, volumetric fly ash content and water-cement ratio on the mechanical properties of lightweight aggregate concrete (LWAC) are discussed in this paper. The fly ash content ranged from 18% to 22% by cement volume, and the water-cement ratios are set to 0.3, 0.33 and 0.36 for each type of LWA. By utilizing the critical influencing parameters, including the water-cement ratio, cement strength, fly ash-cement content ratio, cylinder compressive strength and volume content of LWA, a generalized model for predicting the 28-day LWAC compressive strength was also proposed and compared with four other existing models. The test results showed that a higher strength of LWA and a decreased water-cement ratio resulted in improved mechanical performance, especially in terms of LWAC compressive strength. LWAC crack patterns are quite different from those of normal-weight concrete (NWC). However, for the high-strength lightweight aggregate concrete (HSLAC) proposed in this paper, the crack patterns based on the strength of LWAs is similar to that of mortar matrix, which indicates that each concrete phase is functioning adequately. The proposed 28-day compressive strength predicting model for LWAC is verified, resulting in good agreement with test results, and can be accurately used in design of building or bridge structures.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.23(5) [October 2016]|
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