纤维水泥制品_2023_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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纤维水泥制品

钢-PVA混杂纤维UHPC的弯曲性能试验研究

韩乐冰1，2，齐晓琳3，袁化强4，李永浩4，徐兴伟1，2，李文1，2，牛腾1，2

2023年第8期

摘要

引用本文

摘要：通过四点弯曲试验研究了钢纤维和PVA纤维混掺比例对超高性能混凝土（UHPC）弯曲性能的影响，利用数字图像相关（DIC）技术分析了UHPC的裂缝发展规律。结果表明：在混杂纤维总掺量（2.0%）不变的情况下，随着PVA纤维掺量的增加，UHPC的抗弯强度下降，峰值挠度基本先增大后减小，裂缝数量先增大后减小，裂缝分布均匀性先提升后降低；总体上，混杂纤维UHPC的弯曲性能比单掺钢纤维UHPC的弯曲性能好，钢纤维和PVA纤维混掺时的最佳掺量分别为1.6%和0.4%，此时，UHPC的抗弯强度降幅仅为1.99%，但峰值挠度、裂缝数量显著提高，裂缝分布均匀性明显提升。 Abstract: The influence of the mixing ratio of steel fiber and PVA fiber on the bending performance of Ultra-High Performance Concrete(UHPC) was studied through the four point bending test, and the crack development pattern of UHPC was analyzed by using Digital Image Correlation(DIC) method. The results show that, when the total content of hybrid fibers(2.0%) remains unchanged, with the increase of PVA fiber content, the bending strength of UHPC decreases, the peak deflection basically increases and then decreases, the number of cracks first increases and then decreases, and the uniformity of crack distribution first improves and then decreases. Overall, the bending performance of hybrid fiber reinforced UHPC is better than that of UHPC with steel fiber, and the optimal mixing ratio of steel fiber and PVA fiber is 1.6% and 0.4%. At this time, the bending strength of UHPC decreases by only 1.99%, but the peak deflection and number of cracks significantly increase, and the uniformity of crack distribution significantly improves.

韩乐冰,齐晓琳,袁化强,等.钢-PVA混杂纤维UHPC的弯曲性能试验研究[J].混凝土与水泥制品,2023(8):54-59. HAN L B,QI X L,YUAN H Q,et al.Experimental study on bending performance of steel-PVA hybrid fiber reinforced UHPC[J].China Concrete and Cement Products,2023(8):54-59.

核电工程PX泵房蜗壳区纤维增强混凝土的性能研究

许建华1，2，杜国伟3，刘向坤3

2023年第8期

摘要

引用本文

摘要：根据“华龙一号”核电工程PX泵房蜗壳区钢筋混凝土结构设计要求，设计了掺多功能外加剂的高性能纤维增强混凝土，研究了混凝土的工作性、力学性能、抗氯离子渗透性能和收缩性能。结果表明：掺或不掺多功能外加剂的混凝土工作性、力学性能、抗氯离子渗透性能和收缩性能均满足工程要求；多功能外加剂的掺入对混凝土的坍落度、抗压强度和氯离子扩散系数影响不大，但能显著提高混凝土的先水中14 d后空气中14 d的限制膨胀率，提高混凝土的补偿收缩能力；工程应用结果表明，掺多功能外加剂的混凝土在连续生产期间的28 d抗压强度符合相关标准中的控制要求，标准差仅为2.72 MPa，说明混凝土的质量稳定、可控。 Abstract: According to the design requirements of reinforced concrete structure in PX pump house volute area of "HPR1000" nuclear power project, the high performance fiber reinforced concrete mixed with multifunctional additives was designed, and the workability, mechanical properties, chloride ion penetration resistance and shrinkage performance of concrete were studied. The results show that the workability, mechanical properties, chloride ion penetration resistance, and shrinkage performance of concrete with or without multifunctional additives meet the engineering requirements. The addition of multifunctional additives has little effect on the slump, compressive strength, and chloride ion diffusion coefficient of concrete, but it can significantly increase the limited expansion rate of concrete in water for 14 days and in air for 14 days, and improve the compensating shrinkage ability of concrete. The engineering application results show that the 28 d compressive strength of concrete mixed with multifunctional additives during continuous production meets the control requirements of relevant standards, with a standard deviation of only 2.72 MPa, indicating that the quality of concrete is stable and controllable.

许建华,杜国伟,刘向坤.核电工程PX泵房蜗壳区纤维增强混凝土的性能研究[J].混凝土与水泥制品,2023(8):60-63,75. XU J H,DU G W,LIU X K.Study on performance of fiber reinforced concrete of PX pump house volute area in nuclear power engineering[J].China Concrete and Cement Products,2023(8):60-63,75.

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