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- 混凝土与制品
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利用玄武岩粉末制备超高性能混凝土及其性能研究
作者：高岳毅1，何海波1，张文华2
（1.江苏省安全生产科学研究院，江苏 南京 210042；2.南京林业大学 土木工程学院，江苏 南京 210037）
摘要：为降低超高性能混凝土（UHPC）的成本，实现绿色可持续发展，采用玄武岩粉末制备UHPC，研究了水胶比及玄武岩粉末掺量（等质量取代河砂）对UHPC力学性能的影响。通过结合压汞试验、XRD、SEM探讨了养护温度对玄武岩粉末UHPC微结构的影响。结果表明：随着水胶比的增大，UHPC的抗折与抗折强度明显降低；随着玄武岩粉末掺量的增加，UHPC的抗折与抗压强度先提高后降低。当玄武岩粉末掺量达到55%时，UHPC的抗折与抗压强度较参照组分别提高了43.99%、15.85%。提高养护温度可有效降低混凝土内部的孔隙，提高混凝土内部的密实度，优化混凝土的微观结构。
关键词：玄武岩粉末；超高性能混凝土；水胶比；养护温度；微观结构
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2022）11-0056-04
Preparation of ultra-high performance concrete with basalt powder and its performance research
GAO Yueyi1，HE Haibo1，ZHANG Wenhua2
（1.Jiangsu Academy of Safety Science and Technology，Nanjing 210042，China；
2.School of Civil Engineering，Nanjing Forestry University，Nanjing 210037，China）
Abstract：In order to reduce the cost of ultra-high performance concrete（UHPC） and realize green and sustainable development，basalt powder was used to prepare UHPC. The effect of water-binder ratio and basalt powder dosage（replacing river sand with the same mass） on the mechanical properties of UHPC were studied. Meanwhile，the effect of curing temperature on UHPC microstructure of basalt powder was discussed by mercury injection test，X-ray diffraction（XRD） and environmental scanning electron microscope（SEM）. It was found that the flexural strength and compressive strength of UHPC decreases significantly with the increase of water-binder ratio. The flexural strength and compressive strength of UHPC increased first and then decreased with the increase of basalt powder content. When the content of basalt powder reaches 55%，the flexural and compressive strength of UHPC was 43.99% and 15.85% higher than that of the reference group respectively. In addition，the increase of curing temperature can effectively reduce the pores in the concrete，and then increased the compactness of UHPC internal structure，and further optimize the microstructure of concrete.
Key words：basalt powder，UHPC，water-binder ratio，curing temperature，microstructure