超高性能混凝土配合比优化设计研究

Optimized Design of Ultra-High Performance Concrete Ratio

针对UHPC的配合比优化开展试验研究,试验结果表明,UHPC的扩展度与水胶比呈正相关,力学性能与水胶比呈负相关,合理的水胶比为1.6~1.7, UHPC的扩展度与砂胶比呈负相关,力学性能随砂胶比增大先上升后下降,最佳砂胶比为1.1, UHPC的扩展度与钢纤维掺量呈负相关,力学性能与钢纤维掺量呈正相关,其中,钢纤维掺量大于1.5%之后,抗压强度的变化不明显,而抗折强度显著与钢纤维掺量呈正相关,钢纤维的合理掺量在1.5%~2%。

For the optimization of the proportion of UHPC to carry out experimental research,the test results show that the degree of expansion of UHPC is positively correlated with the ratio of water glue.The mechanical properties and water-cement ratio is negatively correlated,and the reasonable water-cement is 1.6~1.7.UHPC expansion degree is negatively correlated with sand-cement ratio.The mechanical properties of sand-cement ratio with the increase of the first rise after the decline,the optimal ratio of sand is 1.1The extension degree of UHPC is negatively correlated with the steel fiber dosage,and the mechanical properties are positively correlated with the steel fiber dosage,in which,after the steel fiber dosage is more than 1.5%,the change of compressive strength is not obvious.However,the flexural strength is significantly positively correlated with the steel fiber dosage,and the reasonable dosage of steel fiber should be in the range of 1.5%~2%.