Mechanical properties and pore characteristics of aeolian sand concrete

In order to solve the problem of uneven distribution of natural river sand and resource shortage in northwestern of China,aeolian sand concrete was prepared by using the aeolian sand of Kubuqi Desert to replace part of natural river sand as fine aggregate. The experimental study on aeolian sand concrete was carried out through the cube compressive strength,splitting tensile strength and nuclear magnetic resonance porosity. The research results show that with the increase of the aeolian sand content,the early cubic compressive strength value and the splittling tensile strength value of the aeolian sand concrete both first increase and then decrease. The aeolian sand content with 20%,30% and40% concrete can meet the design strength requirements. With the increase of the curing age,the cubic compressive strength and splitting tensile strength of each group of aeolian sand concrete specimens increase differently,and the strength value of concrete with 30% aeolian sand has the largest increase. The T2 spectrum of aeolian sand concrete has three characteristic peaks. With the increase of curing age,the large pores in the concrete develop towards small pores. As the amount of aeolian sand increases,the porosity first decreases and then increases. The gel pores and pores show a tendency to increase first and then decrease. This research can provide a theoretical basis for the application and promotion of aeolian sand concrete in water conservancy projects in arid and semi-arid areas in China.