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Initiation of Single-part Epoxy in cementitious system

Journal of Wuhan University of Technology(Materials Science) 2016年第5期31卷 713-716页

作者：朱吉鹏 LI Zongjin ZHANG Yamei Department of Civil Engineering Nanjing University of Science&TechnologyNanjing 210094China Department of Civil Engineering The Hong Kong University of Science&TechnologyHong KongChina School of Materials Science and Engineering Southeast UniversityNanjing 210096China

In order to make clear the interaction mechanism of single component epoxy in cementitious environment, the interaction between epoxy resin and active silanol, epoxy resin and alkali was investigated From solid-state 13C NMR and FT-IR tests, it is confirmed that silanol group can initiate epoxy resin. Test results have also revealed that alkali as the dominant product of cement hydration can open the epoxide ring making epoxy harden.

关键词： cementitious system epoxy hardener-free

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Effect of mineral additives and permeability reducing admixtures having different action mechanisms on mechanical and durability performance of cementitious systems

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1277-1291页

作者： Ali NEMATZADEH Burcu AYTEKIN Ali MARDANL-AGHABAGLOU Department of Civil Engineering Bursa Uludag UniversityNilufer-Bursa 16059Turkey

In this paper,the effect of usage of the permeability reducing admixture(PRA)having different action mechanisms on hardened state properties of cementitious systems containing mineral additives is *** this aim,three commercial PRAs were used during *** effective parameters in the first and third PRAs were air-entraining and high-rate air-entraining,*** second one contained the insoluble calcium carbonate residue and had a small amount of the air-entraining *** mixes with binary and ternary cementitious systems were prepared by partially replacing cement with fly ash and *** hardened state properties of mortar mixtures such as compressive strength,ultrasonic pulse velocity,water absorption,drying shrinkage and freeze-thaw resistance were *** ternary cement-based mixture having both fly ash and metakaolin was selected as the most successful mineral-additive bearing mix in regard to hardened state *** this sense,PRA-B,with both insoluble residues and a small amount of air-entraining properties,showed the best performance among the mixtures containing *** combined use of mineral additive and PRA had a more positive effect on the properties of the mixes.

关键词： cementitious system mineral additive permeability reducing admixture mechanical properties durability performance

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ELECTRICAL CONDUCTIVE BEHAVIOUR OF cementitious COMPOSITES WITH LOW CONTENT OF HYBRID STEEL-CARBON FIBRE systemS

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Journal of Wuhan University of Technology(Materials Science) 1998年第1期13卷 18-23页

作者：水中和 Wuhan University of Technology China Factualty of Civil Eng. Delft University of Technology Delft Netherlands Coll. of Mat. Science and Technology Wuhan Univ. of Tech. Wuhan 430070 China

Electrical impedance measurements were performed on fine-grained concrete with low volume content of conductive steel and carbon fibres, either as a mono or as a hybrid system. The influences were investigated of the applied frequencies, of fibre combinations and of the age of the composites on the impedance. The results show that when the applied frequency is increased from 0.98 Hz to 1000 Hz, the impedance of the fibre composites significantly decreases. At the same time, impedance difference between plain concrete and fibre-reinforced concrete is enhanced. Dramatic drop of impedance takes place over the low frequency range, i.e. 0.98 to approximately 31 Hz. Impedance also depends on the volume content of hybrid fibres. The cementitious composite with the highest content of hybrid fibres (1.0% steel fibres and 0.2% carbon fibres by volume) has the lowest impedance at all measuring frequencies. 0.6% fibres by volume seem to be a turning point, from which the variation of impedance slows down with the fibre content increases. On the other hand, the impedance increment of the fibre-reinforced composites slows down with the age after 28 days, comparing to plain concrete. (Author abstract) 8 Refs.

关键词： electrical conductive behavior concrete steel-carbon fibre cementitious system

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