| dc.description.abstract | Based on the ratio of 0.22 water-binder ratio, the influence of different silica sand particle size distribution on the porosity of concrete, and No. 3 silica sand is used as the basis for making concrete, adjust the addition of superplasticizer and steel fiber to determine the workability,and use the vibrating table to vibrate for 60 seconds to make the concrete. In addition, in order to improve the quality of concrete container, use 90℃ hot water curing for 1 day to improve the internal microstructure of reactive powder concrete. Reduce the water-binder ratio (W/B=0.22, 0.20 and 0.18) and use hot water curing to improve the internal compactness of the concrete and improve its quality and service performance.
The test results show that the three kinds of concrete proportions are hot water curing at 90℃.In terms of hardening properties, due to increased hydration, 0.18 water binder ratio shows that reducing the water binder ratio can increase the strength; in terms of durability, use low water binder ratio and high-temperature curing accelerates the reaction of pozzolanic reaction. There is no significant difference in the properties of the three concrete mixtures. In terms of the surface resistivity test,0.22 water binder ratio is lower than other ratios due to the higher porosity,large porosity will cause electric current to be transmitted in the concrete more easier.
This study is compared with the mixture M, and it is found that reactive powder concrete has better performance in the compressive strength and porosity test, which shows that reactive powder concrete is also suitable for the development of high integrity container. | en_US |