纳米C-S-H/PCE对蒸养UHPC力学性能增强机理研究

摘要/Abstract

摘要： 目前超高性能混凝土(UHPC)制品的力学性能有待进一步提升,采用纳米C-S-H/PCE对UHPC进行增强在理论上是一种可行的技术途径。本文研究了蒸养条件下掺入以聚羧酸(PCE)为分散剂的纳米水化硅酸钙(C-S-H/PCE)对UHPC力学性能的影响,通过测试水化热、水化产物、微观形貌和孔结构等对其机理进行了分析。结果表明,掺入3.0%(质量分数)纳米C-S-H/PCE可以显著提高蒸养UHPC的抗压强度和抗折强度。掺入纳米C-S-H/PCE可以促进UHPC的早期水化,生成更多的水化硅酸钙(C-S-H)凝胶,使水化放热温峰增高,并缩短达到水化温峰的时间。掺入纳米C-S-H/PCE可有效改善蒸养UHPC的孔结构,在掺量为3.0%(质量分数)时总孔隙率最小,有害孔比例最低。该研究可为纳米C-S-H/PCE在蒸养UHPC中的应用提供参考。

关键词: 纳米C-S-H/PCE, 超高性能混凝土, 孔结构, 水化放热, 蒸汽养护

Abstract: At present, the mechanical properties of ultra-high performance concrete (UHPC) products need to be further improved, and the use of nano-C-S-H/PCE to enhance UHPC is a feasible technical way in theory. The effect of nano-C-S-H/PCE on the mechanical properties of UHPC under steam-cured condition was studied. The influence mechanism was analyzed by measuring hydration heat, hydration products, microstructure and pore structure. The results show that the incorporation of 3.0% (mass fraction) nano-C-S-H/PCE significantly increases compressive and flexural strengths of steam-cured UHPC. The addition of nano-C-S-H/PCE can promote the hydration in early age of UHPC and form more C-S-H gel, and increase the exothermic temperature peak of hydration and shorten time to reach the hydration temperature peak. Also, the pore structure of steam-cured UHPC can be improved effectively by adding nano-C-S-H/PCE, and the total porosity and harmful pore proportion are the lowest at 3.0% (mass fraction) nano-C-S-H/PCE. This study can provide a theoretical reference for the application of nano-C-S-H/PCE in steam-cured UHPC.

Key words: nano-C-S-H/PCE, UHPC, pore structure, hydration heat, steam-curing

中图分类号:

TU528

伍勇华, 易昂, 何娟, 匡玉峰, 原毅冰. 纳米C-S-H/PCE对蒸养UHPC力学性能增强机理研究[J]. 硅酸盐通报, 2024, 43(8): 2797-2805.

WU Yonghua, YI Ang, HE Juan, KUANG Yufeng, YUAN Yibing. Enhancement Mechanism of Mechanical Properties of Steam-Cured UHPC by Nano-C-S-H/PCE[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2797-2805.

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