超高性能混凝土的制备

发布时间：2018-03-08 03:20

本文选题：超高性能混凝土　切入点：水胶比　出处：《硅酸盐通报》2015年12期 　论文类型：期刊论文

【摘要】：采用超低水胶比和高强度水泥常温养护制备超高性能混凝土,以水胶比、钢纤维的体积掺量为变化参数分析了其对超高性能混凝土抗压强度、抗折强度及拉伸性能的影响。研究结果表明:在最大密实度的情况下,混凝土的抗压强度随水胶比的增大而降低。本文钢纤维体积掺量2%,水胶比在0.12~0.22范围内,28 d抗压强度随水胶比的增大先升高后降低,水胶比为0.18时,UHPC的抗压强度最大,达152.8 MPa;钢纤维体积掺量在1.7%~2.9%时,随掺量的增加,抗压强度、抗折强度均呈增大的趋势,在2.9%~3.5%时,抗压强度和抗折强度有下降的趋势,体积掺量为2.9%时,28 d抗压强度和抗折强度达到最大值,分别为153.5 MPa和37.1 MPa。综合经济性、施工性能、力学性能来看,2%为钢纤维最佳体积掺量。在最佳掺量下,拉伸应力达到峰值8.94 MPa时,拉伸应变达0.012%。
[Abstract]:Ultra-low water-binder ratio and high-strength cement curing at room temperature were used to prepare ultra-high performance concrete. The compressive strength of ultra-high performance concrete was analyzed with the ratio of water to binder and the volume content of steel fiber as variable parameters. Effects of flexural strength and tensile properties. The results show that under the condition of maximum compactness, The compressive strength of concrete decreases with the increase of water-binder ratio. In this paper, the volume content of steel fiber is 2, and the compressive strength of UHPC increases first and then decreases with the increase of water-binder ratio in the range of 0.12 ~ 0.22. The compressive strength of UHPC is the largest when the water-binder ratio is 0.18. When the volume content of steel fiber is 1.72.9, the compressive strength and flexural strength of steel fiber increase with the increase of the content of steel fiber, and the compressive strength and flexural strength of steel fiber increase with the increase of the volume content of steel fiber, and the compressive strength and flexural strength of steel fiber increase with the increase of the volume content of steel fiber, and the compressive strength and flexural strength of steel fiber increase with the increase of the volume content of steel fiber. The maximum values of compressive strength and flexural strength for 28 d are 153.5 MPa and 37.1 MPA respectively when the volume addition is 2.9. The optimum volume addition of steel fiber is 2% in terms of economic performance, construction performance and mechanical properties. When the tensile stress reaches the peak of 8.94 MPa, the tensile strain reaches 0.012.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：国家自然科学基金面上项目(51172292)
【分类号】：TU528

【相似文献】