Abstract:In order to verify the coarse aggregate specified in the national standard of construction meets the requirements of hydraulic concrete performance, comparative tests of concrete performance with the maximum particle size of coarse aggregate of 31.5 mm and 40.0 mm were carried out respectively. The cement consumption and unit water consumption of concrete with the same strength grade prepared with hydraulic standard coarse aggregate are reduced to a certain extent, which is basically the same as the compressive strength, tensile strength, ultimate tensile value and elastic modulus test value of concrete prepared with national standard coarse aggregate. Referring to (SL 775—2018), the durability of completed concrete members is evaluated. The durability evaluation result of the selected members under carbonation environment is B (basically satisfied), and the durability evaluation result under osmotic pressure is A (satisfied). The research results show that when the coarse aggregate particle size specified in the national standard is applied in concrete, it can meet the requirements of hydraulic concrete performance specified in the water conservancy industry specification. The application of this research result in the specific water conservancy project construction can effectively solve the practical problem of insufficient sources of coarse aggregate in water conservancy construction projects. This study only compares the effects of aggregates with different maximum particle sizes on the mechanical properties and durability of concrete, but systematic research on the thermal properties and long-term properties of concrete has not carried out.