Abstract
The modulus of elasticity of concrete is often calculated as a function of the compressive strength, and as a deterministic value. However, variations in the aggregates properties may result in module values different than those estimated, which may lead to excessive deformation and eventual instability of the structure. In this work, the influence of the coarse aggregate batch variation on the variability of the modulus of elasticity of the concrete was investigated. Three different aggregate sources (one of granite origin and two of gneiss origin), three water/cement ratios (w/c) and five different batches of each aggregate were investigated. The compressive strength and static modulus of elasticity of the concretes were determined at 28 days. The analysis of variance (ANOVA) showed that the variable "batch" had a significant influence on the modulus of elasticity of the concrete, indicating that this property is a probabilistic variable indeed. The normality of the distribution of its values was attested, and values of characteristic modulus of elasticity were proposed, which were from 6 to 10% lower than the mean values. In addition, the use of gneissic aggregates led to modulus of elasticity values 30% higher than those of the concretes with granitic aggregates and equivalent compressive strengths, while the reduction of the w/c ratio from 0.71 to 0.46 increased the modulus of elasticity in about 5%.
Highlights
The construction of tall buildings in reinforced concrete has become a common practice in South America, eventually exceeding 250 meters in height [1]
The authors found that the modulus of elasticity is more sensitive to high temperature exposure than other mechanical strength, and replacing cement with up to 15% waste fly ash improved the residual modulus of elasticity of concrete
3.1 Compressive strength of concrete the major goal of this work is to check the variability of the module of elasticity of concrete with different batches of aggregate, it is convenient to verify if the compressive strength of the concrete was affected
Summary
The construction of tall buildings in reinforced concrete has become a common practice in South America, eventually exceeding 250 meters in height [1]. In addition to the obstacles encountered in the execution of these buildings, a challenge for structural projects is the rigidity required by these structures, since they are often slender buildings This demand leads to the need for concretes with high elasticity modules. The authors found that the modulus of elasticity of the pastes that make up the self-compacting concretes tends to be higher, due to the presence of mineral additions which promote greater compactness of the cementitious matrix. The authors found that the modulus of elasticity is more sensitive to high temperature exposure than other mechanical strength (e.g. compressive and flexural strength), and replacing cement with up to 15% waste fly ash improved the residual modulus of elasticity of concrete. ALSAMAN et al [4] evaluated the elasticity modulus of ultra-high performance concrete, made
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