Study on mechanical properties of coal gangue mechanical sand C20 concrete
In order to explore the influence of coal gangue mechanical sand on the mechanical properties of low strength grade C20 concrete,the concrete test block was carried out to control the amount of coal gangue mechanical sand mixing and water-cement ratio,and the compression and flexural strength tests were carried out.The results show that under the same water-cement ratio,with the increase of sand mixing in the coal gangue mechanism,the compressive strength of the concrete is first enhanced and then decreased.Under the same substitution rate,the compressive and flexural strength of concrete decreases with the increase of the water-cement ratio.Compared with the sand substitution rate of the coal gangue mechanism,the impact of water ash ratio on the flexural strength of concrete is greater.When the substitution rate does not exceed 30%,it is beneficial to the compressive and flexural strength of concrete,and the compressive and flexural strength of the concrete is increased the most when the water-cement ratio is 0.55 and the substitution rate is 25%.
万方数据
维普
