邹定华,张艺升,肖路通,等.烷基硅烷改性辅助胶凝材料对超高性能混凝土工作性能和力学性能的影响[J].河南理工大学学报（自然科学版）,2026,45(6):185-192.

Zou D H, Zhang Y S, Xiao L T,et al.Effect of short-chain alkyl silane-modified supplementary cementitious materials on the workability and mechanical properties of ultra-high-performance concrete[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(6):185-192.

烷基硅烷改性辅助胶凝材料对超高性能混凝土工作性能和力学性能的影响

邹定华1, 张艺升1,2, 肖路通1, 娄广辉3, 张海波1, 祝瑜1

1.河南理工大学 材料科学与工程学院， 河南 焦作  454003；2.河南省科学院，河南 郑州  450046；3.河南建筑材料研究设计院有限责任公司，河南 郑州  450002

摘要: 目的 为了解决超高性能混凝土（ultra-high performance concrete， UHPC）因低水胶比和硅灰亲水性导致的工作性能差的问题，探讨使用短链烷基硅烷修饰辅助胶凝材料（supplementary cementitious materials， SCMs）以提高UHPC工作性能的可行性。  方法 以丙基三乙氧基硅烷（propyltriethoxysilane， PTOS）和正辛基三乙氧基硅烷（triethoxyoctylsilane， OTES）对硅灰和粉煤灰进行表面改性，测试掺未改性和改性辅助胶凝材料UHPC的坍落扩展度及扩展至400 mm所需时间。通过测试水化热、非蒸发水含量以及抗压和抗折强度，分析改性后的辅助胶凝材料的火山灰反应及其对UHPC各项性能的影响。  结果 结果表明，掺入改性SCMs后，UHPC的工作性能显著提高，且PTOS修饰的SCMs改善效果更好。硅烷的疏水性在1，3 d龄期时抑制了SCMs的火山灰反应，这种抑制作用延迟并降低了改性UHPC的水化热峰，使掺入硅烷改性硅灰的UHPC早期强度和水化产物量均有所下降。但硅烷改性粉煤灰对UHPC早期水化放热和水化产物生成的影响较小。PTOS加速了3 d后水化产物的生成，提高了改性UHPC在3 d后的强度。28 d龄期时，掺入PTOS改性SCMs的UHPC强度与对照组的相当，而掺有OTES改性SCMs的UHPC水化产物数量及强度低于对照组。  结论 烷基硅烷改性SCMs显著提升了新拌UHPC的工作性能，混凝土的扩展度显著增大，早期强度略有影响。

关键词:超高性能混凝土;辅助胶凝材料;烷基硅烷;表面改性

doi:10.16186/j.cnki.1673-9787.2024070028

基金项目:国家自然科学基金资助项目（52279132）；河南省科技攻关项目（232102320194）

收稿日期:2024/07/08

修回日期:2024/10/10

出版日期:2026/10/09

Effect of short-chain alkyl silane-modified supplementary cementitious materials on the workability and mechanical properties of ultra-high-performance concrete

Zou Dinghua1, Zhang Yisheng1,2, Xiao Lutong1, Lou Guanghui3, Zhang Haibo1, Zhu Yu1

1.School of Materials Science and Engineering， Henan Polytechnic University， Jiaozuo  454003， Henan ，China；2.Henan Academy of Sciences，Zhengzhou  450046， Henan ，China；3.Henan Building Materials Research and Design Institute Co.， Ltd.，Zhengzhou  450002， Henan ，China

Abstract: Objectives The poor workability of ultra-high-performance concrete （UHPC） resulting from its low water-to-binder ratio and the hydrophilicity of silica fume was the focus of this study. The feasibility of improving the workability of UHPC by using short-chain alkyl silane-modified supplementary cementitious materials （SCMs） was investigated. Methods Silica fume and fly ash were surface-modified using propyltriethoxysilane （PTOS） and octyltriethoxysilane （OTES）， respectively. The slump flow and T400， defined as the time required for fresh UHPC to spread to 400 mm， were measured for UHPC mixtures containing unmodified and modified SCMs. The pozzolanic reaction of modified SCMs and their effects on the properties of UHPC were analyzed by measuring hydration heat， non-evaporable water content， compressive strength， and flexural strength.  Results The results showed that the incorporation of modified SCMs significantly improved the workability of UHPC， and PTOS-modified SCMs showed a greater improvement in workability than OTES-modified SCMs. The hydrophobicity of silanes inhibited the pozzolanic reaction of SCMs at the ages of 1 and 3 days. This inhibition delayed and reduced the main hydration heat evolution peak of modified UHPC. Consequently， the hydration products and early-age strength of UHPC incorporating silane-modified silica fume decreased. However， silane-modified fly ash had a relatively minor effect on the early-age hydration heat evolution and hydration product formation of UHPC. PTOS promoted the formation of hydration products after 3 days and improved the strength of modified UHPC after 3 days. At 28 days， the strength of UHPC containing PTOS-modified SCMs was comparable to that of the control group， whereas UHPC containing OTES-modified SCMs exhibited lower amounts of hydration products and lower strength than the control group.  Conclusions Short-chain alkyl silane-modified SCMs significantly improved the workability of fresh UHPC， increased the slump flow， and had only a slight influence on early-age strength.

Key words: ultra-high-performance concrete ;supplementary cementitious materials; alkyl silane; surface modification