Evolution of Mechanical Property and Microstructure of Fibre-Reinforced Ultra High Strength Mortar with Desert Sand

Previous research showed that the concrete’s strength is obviously decreased when river sand was substituted by desert in abundance. In this paper, a new type of fibre-reinforced ultra high-strength mortar studied. mix design mortar, low W/B used to save water. Also, fly ash and silica fume were adopted partly replace cement, completely take place sand. At same time, steel fibre improve toughness. The pore structure changes different high studied MIP. SEM XRD study microstructure hydration product changes. results are as follows: mortar’s mechanical properties improved content rise. When substitute completely, compressive increased 36.91%, which reached 149.08 MPa. With sand’s addition, porosity decreases its optimized. Desert played an active part promoting increasing products, densifying improving properties..The paper solves problem high-content cannot meet demand, provides actual application theoretical basis.