粗骨料UHPC的制备及性能研究
Preparation and performance study of UHPC with coarse aggregates
关键词：
超高性能混凝土（UHPC）；配合比；干燥收缩；抗压强度；模型
Key words：
Ultra-high performance concrete(UHPC); Mix proportion; Drying shrinkage; Compressive strength; Model
刊期：
2025年第7期
DOI：
10.19761/j.1000-4637.2025.07.054.07
文章编号：
基金项目：
作者：
唐六九1，刘 彪2，*，王 强2，龚梓能1
单位：
1.西北电力设计院有限公司，陕西 西安 710075；2.西安建筑科技大学 土木工程学院，陕西 西安 710055
摘要
摘 要：研究了粗骨料掺量（0、10%、18%、26%、34%）对超高性能混凝土（UHPC）干燥收缩和抗压性能的影响，并建立了粗骨料UHPC的干燥收缩模型；另外，在固定粗骨料掺量条件下，研究了水胶比、砂胶比、石英粉掺量、钢纤维（SF）体积掺量和混杂比例对UHPC抗压性能的影响。结果表明：掺入适量粗骨料能有效抑制UHPC的干燥收缩，建立的粗骨料UHPC干燥收缩模型具有较高精度；掺入适量粗骨料、SF，或者适当增大水胶比、砂胶比或石英粉掺量均能提升UHPC试件的抗压强度和轴心抗压强度，但平直型和端钩型SF混杂对UHPC试件抗压强度和轴心抗压强度的影响较小；UHPC试件的抗压强度高于轴心抗压强度；粗骨料UHPC轴心抗压强度与抗压强度的换算系数为0.852。
Abstract: The effects of coarse aggregates content(0, 10%, 18%, 26%, 34%) on the drying shrinkage and compressive property of ultra-high performance concrete(UHPC) were investigated, and a drying shrinkage model of UHPC with coarse aggregates was established. Furthermore, under the condition of fixing the coarse aggregates content, the effects of water-binder ratio, sand-binder ratio, quartz powder content, content and hybrid ratio of steel fibers(SF) on the compressive property of UHPC were investigated. The results show that, adding appropriate content of coarse aggregates can effectively inhibit the drying shrinkage of UHPC, and the established drying shrinkage model of UHPC with coarse aggregates has high accuracy. Adding appropriate content of coarse aggregates and SF, or appropriately increasing the water-binder ratio, sand-binder ratio, or the content of quartz powder can improve the compressive strength and axial compressive strength of UHPC specimens, but the effect of mixing straight SF and end-hooked SF on the compressive strength and axial compressive strength of UHPC specimens is smaller. Compressive strength of UHPC specimens is higher than axial compressive strength. The conversion coefficient between axial compressive strength and compressive strength of UHPC specimens with coarse aggregates is 0.852.
结论
（1）掺入适量粗骨料能有效抑制UHPC试件的干燥收缩，粗骨料UHPC试件的7 d干燥收缩值约为90 d干燥收缩值的84%；建立的粗骨料UHPC干燥收缩模型具有较高的精度。
（2）掺入适量平直型SF的UHPC立方体试件受压时呈韧性破坏形式，出现多缝开裂的特征；UHPC棱柱体试件的抗压破坏形态主要为斜向剪切与楔型破坏。
（3）掺入适量的粗骨料、SF，或者适当增大水胶比、砂胶比或石英粉掺量均能提升UHPC试件的抗压强度和轴心抗压强度，但平直型和端钩型SF混杂对UHPC试件抗压强度和轴心抗压强度的影响较小；不论采用何种配合比，UHPC试件的抗压强度均高于轴心抗压强度；粗骨料UHPC试件的轴心抗压强度与抗压强度的换算系数为0.852。
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引用本文
唐六九,刘彪,王强,等.粗骨料UHPC的制备及性能研究[J].混凝土与水泥制品,2025(7):54-60.
TANG L J,LIU B,WANG Q,et al.Preparation and performance study of UHPC with coarse aggregates
[J].China Concrete and Cement Products,2025(7):54-60.
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