Abstract
In this study, a comprehensive experimental investigation and modeling were carried out to examine the impact of two different grain size distributions of glass powder (GP) ((55 µm GP-B)) in various percentages up to 30% on the mechanical characteristics of concrete at different testing ages (7, 28,56, and 91 days). The experimental data observed were utilized to develop different models for characterizing the compressive, splitting, and flexural strength behavior of concrete modified with GP. Results indicated that, up to 25% of cement replacement with GP, the difference in particle size of GP does not have a substantial impact on the mechanical performance of concrete if it is less than 135 μm. Irrespective of GP particle size and the curing days, the increasing percentage of GP replacement up to 10% for compressive strength and up to 15% for splitting and flexural tensile strength tends to marginally reduce compressive, splitting, and flexural tensile strength at 28 days by 4%, 8%, and 6%, respectively. The developed models were found to be well predicted by curing ages, water to binder ratio (w/b), and GP content. Based on the model parameters, the percentage of GP to partially replace cement is much more effective than the particle size of GP, w/b, and curing time in changing the mechanical properties of normal strength concrete. The analytical results were in good agreement with the experimental investigation.
Highlights
Concrete is currently considered to be the most frequently used building material
The results generally indicate that the variation in the particle sizes of the glass powder (GP) does not contribute to a significant difference in the values of the concrete tensile strength
From experimental and analytical results, it was observed that the difference in particle size distributions of GP does not have a significant effect on the strength development values of concrete replaced cement with GP up to 25%; to propose a formula for the prediction of compressive strength without taking into account the particle size effect of GP, Equation (7a) is proposed
Summary
Concrete is currently considered to be the most frequently used building material. It is considered as the world's second most frequently used material after water [1]. Jiang et al [27] used GP having different particle sizes (75 μm and 150 μm) and substitutions (up to 80% by weight of cement) to experimentally study the pozzolanic behavior of GP at various testing ages (7, 28, and 91 days). They observed that there is a linear reduction in both compressive and splitting tensile strength with the increased replacement percentage. The paper aims (i) to characterize the effect of the particle size distributions (PSD) and various percentage amounts of waste GP used to partially replace cement by weight on the mechanical characteristics of concrete at different curing times. The paper aims (i) to characterize the effect of the particle size distributions (PSD) and various percentage amounts of waste GP used to partially replace cement by weight on the mechanical characteristics of concrete at different curing times. (ii) To quantify the effect of various independent variables governing the mechanical behavior of concrete modified with glass powder (GP-concrete)
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