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在水泥混合料中加入外加剂 K_2CO_3和磺化三聚氰胺-甲醛共聚物,可以改善混合料的泌水性和流动性,并能提高水泥制品的早期强度和长期强度。每100份(重量份)水泥中外加剂的用量为:K_2CO_3 7.5—25份,磺化三聚氰胺-甲醛共聚物O.5—10份,最好还另外加入水溶性聚合物0.05—5份。例如,在由100份水泥和300份砂子混合成的水灰比为0.5的砂浆中,加入2份磺化三聚氰胺-甲醛共聚物和10份K_2CO_3,混合均匀后模塑成型并硬化成试块。这种砂浆具有非常优良的流动性,硬化后的试块(直径100毫米,长度
Adding the admixture K_2CO_3 and sulfonated melamine-formaldehyde copolymer to the cement mixture can improve the mixture’s water-leaching and fluidity, and can improve the early strength and long-term strength of cement products. The amount of admixture used per 100 parts (by weight) of cement is: 7.5-25 parts of K2CO3, 0.5-10 parts of sulfonated melamine-formaldehyde copolymer, and preferably 0.05-5 parts of water-soluble polymer. For example, in a mortar prepared by mixing 100 parts of cement and 300 parts of sand with a water-cement ratio of 0.5, 2 parts of a sulfonated melamine-formaldehyde copolymer and 10 parts of K 2 CO 3 are added, uniformly mixed, molded and hardened into test pieces. This mortar has very good fluidity, after the hardened test block (diameter 100 mm, length