Compressive, bending and direct tensile strength characteristics of ultra-highperformance concrete using crushed sand aggregate

Abstract

Using ultra-high-performance concrete (UHPC) with superior features such as strength, durability, high flow and toughness, while low chloride ion permeability and spontaneous shrinkage helps improve resistance load and ensures the sustainability of construction works against adverse environmental impacts. The continued research and application of this type of concrete with features suitable for concrete structures that are constantly being added and perfected is meaningful in creating a premise for widespread application of this type of concrete in construction reality. This article studies the mechanical properties of ultra-high-performance concrete when using crushed sand aggregate. The authors conducted experiments on concrete mixes that were designed and adjusted on the M3Q fine-grained mix, applying them to local material conditions in Vietnam. The mechanical properties of UHPC using CS are determined as: compressive strength, elastic modulus, Poisson's ratio, tensile strength and bending strength. Based on the experimental results, it is possible to produce UHPC with CS aggregate to achieve a compressive strength of
about 130MPa, direct tensile strength of over 7MPa and flexural strength of over 15MPa.

Keywords: UHPC; crushed sand; quartz sand; the steel rope; moist heat curing; flow; compressive strength; tensile strength; bending strength; elastic modulus; poisson coefficient.