Enhancing waterproof performance of alkali-activated slag by optimising pore structure and introducing hydrophobic groups using tetraethoxysilane
Source abstract
Abstract
In this study, tetraethoxysilane (TEOS) was added into alkali-activated slag (AAS) to enhance water resistance. The products of TEOS hydrolysis and condensation were analysed and characterised. Meanwhile, the influences of TEOS on compressive strength, fluidity, setting time, pore structure, water absorption process, hydration products and water contact angle of AAS were studied. The experimental results demonstrated that the presence of unhydrolysed TEOS slightly enhanced the fluidity and prolonged the setting time of AAS. Additionally, while the incorporation of TEOS slightly reduced the formation of hydration products after 28 days, the nucleation and filling effects of the nano-silicon dioxide particles accelerated the long-term hydration process of AAS. As a result, the compressive strength of the material improved by a maximum of 6.56% after 90 days. By optimising the pore structure and introducing hydrophobic groups into the AAS, the waterproof performance of TEOS-modified AAS has been significantly enhanced. As a result, the water contact angle increased from 20.05° to 64.05°, and capillary water absorption was reduced by 1.79–13.52% with the addition of TEOS.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Microbial Applications in Construction Materials · Building materials and conservation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Anhui University of Science and Technology School of Civil Engineering and Architecture, , Huainan,
Anhui University of Science and Technology School of Civil Engineering and Architecture, , Huainan, ; Anhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology, Huainan, China; The Key Laboratory of Advanced Civil Engineering Materials of Anhui Province, Anhui Jianzhu University, Hefei, China; Anhui Hongchang New Materials Co. Ltd, Huaibei, China
Anhui Jianzhu University The Key Laboratory of Advanced Civil Engineering Materials of Anhui Province, , Hefei,
Anhui University of Science and Technology School of Civil Engineering and Architecture, , Huainan, ; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, China
Funding
Open Foundation of Anhui Key Laboratory of Mining Construction Engineering · National Natural Science Foundation of China · Open Foundation of the Key Laboratory of Advanced Civil Engineering Materials of Anhui Province · Anhui Province Science and Technology Plan Project of Housing Urban-rural Construction · Outstanding Youth Project of Natural Science Research in Universities of Anhui Province
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Show source-provided references
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