New insight into the effects of silane-modified silica fume on the performance of cement pastes

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Yanrong Zhang , Xuesong Zhang , Zichen Lu , Kai Wu , Xiaopei Cai
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Abstract

Hydrophobic-modified silica fume (HSF) with superior dispersion was synthesized by coating silane onto SF surface. Its influence on cement hydration, microstructure and properties of cement pastes was investigated. Results indicated that the silane on SF surface visibly depressed pozzolanic reaction at early ages. HSF retarded cement hydration by adsorbing on cement surface and more importantly, by interacting with Ca2+ in aqueous phase. For the first time, the accumulation of calcium around HSF was observed, leading to the growth of needle-like C–S–H perpendicular to HSF surface and eventually evolved into loose honeycomb-like gels. These loose gels promoted pozzolanic reaction and cement hydration at late ages. TEM and XRD results revealed that silane incorporated itself into C–S–H and altered structural order. Furthermore, adding HSF increased capillary pore size but refined the inter-hydrate pores at late ages. HSF visibly decreased the compressive strength compared with SF; however, the difference diminished at late ages.
硅烷改性硅灰对水泥浆性能影响的新见解
在硅粉表面涂覆硅烷,合成了分散性较好的疏水改性硅粉(HSF)。研究了其对水泥水化、水泥浆体微观结构和性能的影响。结果表明,SF表面的硅烷明显抑制了早期的火山灰反应。HSF通过吸附在水泥表面,更重要的是通过与水相中Ca2+的相互作用来延缓水泥水化。首次观察到钙在HSF周围的积累,导致垂直于HSF表面的针状C-S-H生长,最终演变成松散的蜂窝状凝胶。这些松散的凝胶在后期促进了火山灰反应和水泥水化。TEM和XRD结果表明,硅烷与C-S-H结合,并改变了结构顺序。此外,添加HSF增加了毛管孔径,但在后期细化了水合物间孔隙。与顺丰相比,HSF明显降低了抗压强度;然而,随着年龄的增长,这种差异逐渐减弱。
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来源期刊
Cement and Concrete Research
Cement and Concrete Research 工程技术-材料科学:综合
CiteScore
20.90
自引率
12.30%
发文量
318
审稿时长
53 days
期刊介绍: Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.
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