Research on Mechanical and Thermal Properties of Eps-Molybdenum Tailings Concrete Hollow Block Masonry

Abstract

EPS-molybdenum tailing concrete hollow block is an innovative building material derived from the integrated use of EPS and molybdenum tailings. This study established the optimal mix ratio for the new type of hollow block was determined using a 3-factor, 3-level orthogonal design. The optimal ratio was determined to be 40% molybdenum tailings and 1% EPS. Based on the optimal mix ratio, three strength levels of EPS-molybdenum tailings concrete hollow block were prepared: MU3.5, MU5, and MU7.5. Physical and mechanical properties tests were performed on the specimen. The experimental results showed that the damage pattern of the new type of hollow block was similar to that of ordinary concrete hollow blocks. In comparison to coral aggregate concrete hollow blocks and ordinary concrete hollow blocks, the EPS-molybdenum tailings concrete hollow blocks exhibited the lowest water content and water absorption. Meanwhile, the compressive and flexural strengths of all the specimens reached the design strength level of 4.28 MPa, 5.83 MPa, 8.1 MPa; 1.02 MPa, 1.63 MPa, and 2.27 MPa. Simultaneously, three different strengths of masonry mortar were prepared, following which the mechanical and thermal properties of the newly prepared hollow block masonry were investigated. The equations for compressive and shear strength of the new hollow block masonry were provided in compliance with national standards, along with the expression for the compressive stress-strain relationship, yielding favorable results.

Keywords: Molybdenum tailings, EPS, Hollow block, Masonry, mechanical properties, Thermal Properties