Environmental and economical friendly ultra-high performance-concrete incorporating appropriate quarry-stone powders
Environmental and economical friendly ultra-high performance-concrete incorporating appropriate quarry-stone powders
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含有适当采石粉的环保且经济的超高性能混凝土
DOI：
10.1016/j.jclepro.2020.121112
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发表时间：
2020
影响因子：
11.1
通讯作者：
He Yongjia
中科院分区：
文献类型：
--
作者：
Yang Rui;Yu Rui;Shui Zhonghe;Gao Xu;Han Jinlong;Lin Gang;Qian Diao;Liu Zhijie;He Yongjia
采石场石粉是固体废弃物之一，具有明显的环境风险。为了解决这一问题，本研究采用两种采石场石粉（玄武岩和石灰石粉）替代22.2%-44.4%的水泥，生产环保型超高性能混凝土（UHPC）。材料配合比设计是基于修正的Andreasen和Andersen（MAA）模型进行的。研究了石粉对超高性能混凝土的流动性、抗压强度、早期水化动力学和耐久性的影响。结果表明，掺入石粉能显著改善UHPC的流动性，减缓水泥的早期水化速率，降低UHPC的早期自收缩。此外，石粉的掺入会降低UHPC的7天强度，而其56天强度与参考混合料相当。CO2排放量计算表明，应用采石场石灰石粉可显著降低UHPC的环境负担，这意味着所生产的UHPC在不久的将来可被视为具有先进性能的绿色建筑材料。
Quarry stone powder is one of the solid waste, which can create obvious environmental risks. To solve this problems, 22.2%–44.4% of cement is replaced by two types of quarry stone powder (basalt and limestone powders) in producing an environmentally-friendly ultra-high performance concrete (UHPC) in this study. The material mix design is followed on the basis of the modified Andreasen and Andersen (MAA) model. Then, the impact of the quarry stone powders on fresh and hardened properties of UHPC are investigated, including flowability, compressive strength, early hydration kinetics, and durability. The results indicate that the incorporation of quarry stone powder can significantly improve the flowability, slow down the early hydration rate of cement and decrease autogenous shrinkage of UHPC during early age. Besides, the addition of quarry stone powder could decrease the strength of UHPC at 7 days, while its strength is comparable with the reference mix at 56 days. The carbon dioxide (CO2) emissions calculation shows that application of quarry limestone powder can significantly reduce the environmental burden of UHPC, which means the produced UHPC can be treated as a green building material with advanced properties in the near future.