免蒸养石灰岩机制砂UHPC的改性制备及性能研究

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中图分类号：TQ178 文献标志码：A文章编号：1001-5922（2026）03-0692-04

Study on modified preparation and properties of steam-curing-free limestone manufactured sand UHPC

ZHANG Jian' ，YANG Chengjun²，WU Xiaoyuan1 ，LI Xisong1 ， HUANG Bingyu，WEI Chen，WANG Wen

（1.Guangxi Zhuang AutonomousRegion Construction Engineering QualityTesting CenterCo.，Ltd.，Nanning 5300，Cina 2.Guangxi IndustryPromotionandSmalland Medium-sized Enterprises Service Center，Guangxi Nanning 530o，China）

Abstract：To improve the environmental protection and mechanical properties of ultra-high performance concrete （UHPC），limestone manufactured sand，cement and other materials wereused as the mainraw materials tooptimize a steam-curing-fre limestone manufactured sand UHPC，and steel fibers were added to modifyits properties.The results show that compared with manufactured sand and natural riversand，limestone manufactured sand reduces the fluidityof concrete materials and improves the mechanical properties of UHPC.The UHPC achieves the optimal mechanical properties when limestone manufactured sand is added with a steel fiber content of 0.3% .Among them，the compressive strength and flexural strength reach 149.31 MPa and 19.43 MPa respectively，and the material has good water resistance with a water absorption rate of only 2.76% ：

Key words ：concrete; limestone; mechanism sand ; mechanical properties ; water absorption

超高性能混凝土（UHPC）具有较好的力学性能，且耐久性也比较优异，成为现代工程领域的重要研究对象[1-2]。（剩余5733字）