Abstract
In this work, the relationships between the mechanical properties (i.e., compressive strength and flexural strength) and loading speed of polypropylene fiber (PPF)-incorporated cement mortar at different ages (before 28 days) were studied. A total of 162 cubic samples for compressive strength tests and 162 cuboid samples for flexural strength tests were casted and tested. Analytical relationships between the sample properties (i.e., sample age, PPF content, and loading speed) and compressive and flexural strength were proposed based on the experimental data, respectively. Of the predicted compressive and flexural strength results, 70.4% and 75.9% showed less than 15% relative error compared with the experimental results, respectively.
Highlights
Cement-based materials are the most widely used construction materials around the world
The cubic cement mortar samples used for the compressive strength tests were cast with the dimensions of 70.7 × 70.7 × 70.7 mm, while the cuboid samples for the flexural strength tests were cast with the dimensions of 40 × 40 × 160 mm
Threecontent fiber volume fractions of cement mortar were designed to study influence the fiber on mechanical of cement mortar were designed to study the influence of the fiber content on mechanical properties, and for each mixture, three different loading speeds were used to study the properties, for each mixture, three different loading speeds were were used used for to study the influence of and loading speed on mechanical tests; three duplicates the cominfluence of loading speed on mechanical tests; three duplicates were used for the compressive and flexural strength tests of each mixture at the designated age
Summary
Cement-based materials are the most widely used construction materials around the world. PPF has been used in light-weight concrete to improve the compressive strength and the crack-resistance performance [15]. The first study of the loading speed influence on the mechanical properties of cement-based materials was performed by Abrams in 1917 [31]. Kaplan [34] studied the influence of loading rate on the compressive strength of concrete and found that the moisture content is one of the important variables affecting the relationship between strength and loading speed. Quantitative relationships between the loading speed and mechanical properties of PPF-incorporated cement mortar are still lacking, despite a lot of qualitative relationships having been obtained in the existing literature. Analytical relationships between the sample properties (i.e., sample age, PPF content, and loading speed) and compressive and flexural strength are proposed, respectively, based on the experimental data
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