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本文就三类常用减水剂在单矿物C_3S、C_2S、C_3A、C_4AF上和在矿渣、煤矸石和水泥上的表观吸附量及其对ξ电位的影响进行讨论。 三种减水剂在C_3A上的表观吸附量都远远超过在C_3S上的表观吸附量。石膏的存在则使其在C_3A上的表观吸附量大减。 减水剂在煤矸石上的表现吸附量仅次于在C_3A上的表观吸附量,而在矿渣上则极小。 C_3A和C_4AF在蒸馏水中的ξ电位为正值,在减水剂溶液中的ξ电位则随溶液浓度的增加而迅速降低。在达到等电点时的浓度下,C_3A对减水剂的表观吸附量远远超过C_4AF。 显然,水泥中的C_3A对减水剂效果的影响最大。
In this paper, the apparent adsorption capacities of three common water-reducing agents on mono-minerals C 3 S, C 2 S, C 3 A, C 4AAF and on slag, coal gangue, and cement are discussed. The apparent adsorption capacity of the three superplasticizers on C_3A far exceeds the apparent adsorption on C_3S. The presence of gypsum greatly reduced the apparent adsorption on C_3A. The performance of the water-reducing agent on coal gangue is second only to the apparent adsorption on C_3A, but is minimal on slag. The zeta potential of C_3A and C_4AF in distilled water is positive, and the zeta potential in the water reducer solution decreases rapidly with increasing concentration of the solution. At the isoelectric point concentration, the apparent adsorption of C_3A to water reducer far exceeds that of C_4AF. Obviously, C_3A in cement has the greatest effect on the effect of water reducer.