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本文采用了导热量热法、TGA、DSC、DTA、SEM-EDXA、氦比重法以及压汞测孔法研究了掺硅灰之后,水泥石微结构的变化。发现了其孔结构的特征并阐明了造成这种特征的原因。利用所提出的孔结构模型可以解释掺硅灰水泥石、砂浆和混凝土的许多力学性能以及耐久性得以提高的原因。
Abstract：Conductive calorimetry, TGA, DSC, DTA, SEM-EDXA, helium comparasion pycnomerry and mercury intrusion porosimetry were used to study the micro-structural changes of hardened cement pastes when cement was blended with silica fume.In the cement pastes containing silica fume, at first, the hydration is accelerated by nucleation effect. Ca(OH)2 forms very quickly and reactswith silica fume producing less crystalline, more amorphous and denser C-S-H of Iow C/S ratio which forms an impermeable structure with less or no Ca(OH)2. This makes the interface between unhydrated cement grains and C-S-H so dense and homogeneous that capillary pores or large pores are not connected through the coarse path between the unhydrated cement grains and Ca(OH)2 or Ca(OH)2 itselfs as it occurs in the neat cement paste, so the pore systems become much less continuous causing a large amount of "trapped" pores to be forraed which are difficult to be conneted with external pores.Using the proposed pore structure model, the improvement of mechanical properties and durability in hardened cement paste, mortar and concrete blended with silica fume can be explained.
[1] R.F.Feldman. Prec. of the 5th Intern. Symp. on the Chem. of Cement, 1968, Tokyo, PartⅢ, 55, (1968) .
[2] M. Regourd, in P-C. Aitcin Ed., 《Condensed Silica Fume》, University of Sherbroke, Canada, 20 (1983) .
[3] H.F.W.Taylor,水泥化学讲座,北京(1980) 。
[4] R.F.Feldman, Proc. of the 1st. Intern. Congr. on the Use of Fly Ash, Silica Fume, Slag and Other Mineral By-Product in Concrete, Montebello, Canada, 415(1983) .
[5] R.F.Feldman, J.Amer.Ceram.Soc., 67, 30(1984) .
[6] R.F.M.Bakker, "About the Cause of the Resistance of Blastfurnace Cement Concrete to the Alkali-Silica Reaction", Conference on Alkali-Aggregate Reaction in Concrete, Cape Town, Sourth Africa(1981) .
[7] R.F.Feldman and Huang Chengyi, Prec. of the RILEM Seminar on the Durabiliiy of Concrete Structures under Normal Outdoor Exposure, Hanovr, FRG, 133～140(1984) .
[8] Huang Chengyi and R.F.Feldman, Cement and Concrete Res., 15, 585(1985)
[9] R.F.Feldman and Huang Chengyi, "Properties of Portland Cement-Silica Fume Paste, Ⅰ.Porosity and Surface Properties" (To be published in Cement and Concrete Res.).
[10] R.F.Feldman and Huang Chengyi, "Properties of Portland Cement-Silica Fume Pastes, Ⅱ. Mechanical Properties" (To be published in Cement and Concrete Res.).
[11] Huang Chengyi and R.F.Feldman, Cement and Concrete Res., 15, 289(1985) .
[12] Huang Chengyi and R.F.Feldman, "Dependence of Frost Resistance on the Pore Structure of Mortars Containing Silica Fume" (To be published in ACI Journal).
[13] R.F.Feldman and Huang Chongyi, "Resistance of Mortars Containing Silica Fume to Attack by adSolution Containing Chlorides" (To be publishde in Cewent and Concrete Res.).
基本信息:
引用信息:
[1]黄成毅,R.F.Feldman.掺硅灰水泥石孔结构的特征[J].硅酸盐学报,1985(03):301-310.
1985-06-30
1985-06-30