基于低碳硅铝酸盐胶凝体系的UHPC性能研究
Performance study of UHPC based on low-carbon silicoaluminate cementitious system
关键词：
低碳硅铝酸盐胶凝体系；超高性能混凝土（UHPC）；水化；工作性；力学性能；收缩变形；低碳
Key words：
Low-carbon silicoaluminate cementitious system; Ultra-high performance concrete (UHPC); Hydration; Workability; Mechanical property; Shrinkage deformation; Low-carbon
刊期：
2026年第3期
DOI：
10.19761/j.1000-4637.25100467
文章编号：
基金项目：
江苏省自然科学基金资助项目（BK20221198）；2025年中建四局科技研发计划项目（CSCEC4B-2025-KTA-17）。
作者：
姜自华1，徐 文2，*，周泽聪2，陈燕强3，翟光耀3
单位：
1.苏州轨道交通科技创新研究院有限公司，江苏 苏州 215008；2.重大基础设施工程材料全国重点实验室，江苏苏博特新材料股份有限公司，江苏 南京 211103；3.中建四局第六建设有限公司， 安徽 合肥 230000
摘要
摘 要：对比研究了普通硅酸盐胶凝体系（基准组）和低碳硅铝酸盐胶凝体系（低碳组）的水化热特征及2种胶凝体系对超高性能混凝土（Ultra-high performance concrete，UHPC）工作性、力学性能和收缩性能的影响。结果表明：相比于普通硅酸盐胶凝体系，低碳硅铝酸盐胶凝体系的早期水化放热速率较低，水化放热速率峰值出现时间延迟，而水化放热总量基本相当；2组胶凝体系UHPC的扩展度、含气量和表观密度相近，但低碳组的凝结时间更长；低碳组UHPC的3 d抗压强度、动弹性模量均低于基准组，但后期抗压强度反超基准组，动弹性模量与基准组基本持平；低碳组UHPC在6 d龄期前的内部相对湿度高于基准组，对应的自收缩值低于基准组，6 d龄期后的内部相对湿度降低速率明显高于基准组，自收缩值高于基准组；低碳组UHPC的质量变化率小于基准组，干燥收缩变形也低于基准组。
Abstract： A comparative study was conducted on the hydration heat characteristics of an ordinary Portland cementitious system (reference group) and a low-carbon silicoaluminate cementitious system (low-carbon group), as well as the effects of both cementitious systems on the workability, mechanical properties, and shrinkage behavior of ultra-high performance concrete (UHPC). The results show that, compared with the ordinary Portland cementitious system, the low-carbon silicoaluminate cementitious system exhibits a lower early hydration heat release rate and a delayed hydration heat peak, while the total hydration heat release remains essentially equivalent. The slump-flow, air content, and apparent density of UHPC prepared with the two cementitious systems are approximately similar, but the low-carbon group exhibits a longer setting time. The 3 d compressive strength and dynamic elastic modulus of the low-carbon group UHPC are lower than those of the reference group, while its long-term compressive strength exceeds that of the reference group and its dynamic elastic modulus remains essentially comparable to that of the reference group. The internal relative humidity of the low-carbon UHPC group before 6 d is higher than that of the reference group, with correspondingly lower autogenous shrinkage values. After 6 d, the rate of decrease in internal relative humidity of the low-carbon group is significantly higher than that of the reference group, and the autogenous shrinkage values are higher than those of the reference group. The mass change rate of the low-carbon UHPC group is lower than that of the reference group, resulting in correspondingly lower drying shrinkage deformation.
结论
（1）相比于普通硅酸盐胶凝体系，低碳铝硅酸盐胶凝体系的早期水化放热速率较低，水化放热速率峰值出现时间延迟，但水化放热总量与之相当。
（2）2组胶凝体系UHPC的扩展度均为750 mm，含气量均约为3%，表观密度为2 450~2 490 kg/m3，但低碳组UHPC的凝结时间长于基准组UHPC。
（3）低碳掺合料部分取代水泥后，UHPC的力学性能发展呈现一定的滞后性，低碳组UHPC在3 d时的抗压强度和动弹性模量均低于基准组，但后期偏高岭土对水化的促进作用使得力学性能随龄期逐渐增长，28 d、56 d抗压强度较基准组分别提高了7%、12%，14 d动弹性模量与基准组相当。
（4）UHPC自收缩变形发展规律与其内部相对湿度变化规律具有一定的相关性：6 d前，低碳组UHPC内部相对湿度高于基准组，其自收缩值低于基准组；6 d后，低碳组UHPC内部相对湿度降低速率明显高于基准组，其自收缩值高于基准组。
（5）UHPC干燥收缩变形发展规律与其质量变化率的发展规律具有一定的相关性：低碳组UHPC在干燥条件下的质量变化率小于基准组，对应的干燥收缩变形也随之低于基准组。
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引用本文
姜自华,徐文,周泽聪,等.基于低碳硅铝酸盐胶凝体系的UHPC性能研究[J].混凝土与水泥制品,2026,53(3):82-86. JIANG Z H,XU W,ZHOU Z C,et al.Performance study of UHPC based on low-carbon silicoaluminate cementitious system[J].China Concrete and Cement Products,2026,53(3):82-86 (in Chinese).
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