Xiang Ming Kong;Hui Liu;Zhenbao Lu;Dongmin Wang;
<正>This paper systematically investigates the influence of three types of silane(TEOS, tetraethoxysilane;APTES,3-aminopropyltriethoxysilane;AEAPTMS, N-2-aminoethyl-3-aminopropyltrimethoxysilane) on the workability,strength development and hydration of cement pastes and mortars.Techniques including X-ray diffraction(XRD),thermo gravimetric analysis(TGA) were employed to characterize the the cement hydration process at varied ages.Results show that:I) three silanes induce a dispersive effect on cement pastes indicated by improved flow table spreads,among which AEAPTMS leads to highest flowability of cement pastes;2) AEAPTMS and APTES reduce the hydration degree determined by measurement of non-evaporable water amount and portlandite amount in the hydration products before 90d;3) three silanes exhibit negative influence on the development of compressive and flexural strength of mortar hydrated for 3 days,while AEAPTMS and APTES increase the strength of mortar after 28 and 90 days curing.In addition,results show that methanol and ethanol,which are hydrolysis products of silanes,have no significant effects on the flowability,strength development and hydration kinetics of cement pastes. Originality 1.Three silanes improve the flowability of cement pastes 2.AEAPTMS and APTES leads to increases in 28d,90d strength for cement pastes, while TEOS have negative effect on strength development of mortars 3.Three silanes affect retard cement hydration by reducing the hydration degree 4.Methanol and ethanol had no significance effects on flowability,strength development.
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