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【问】冬季施工混凝土外加剂,一般都有氯化物,但是《钢筋混凝土施工及验收规范》(GBJ10-65)第276条提到11种情况不得在钢筋混凝土中掺氯化物,这应当怎样理解?掺入阻锈剂的外加剂可否在预应力混凝土以及使用冷拉钢筋和冷拔低炭钢丝的钢筋混凝土结构中使用?请给予解答。(陕西省马学忠)【答】目前常温施工时常用的早强剂一般是采用0.5%食盐加0.03%三乙醇胺,在冬季施工时则再掺入1%
【Q】 Winter concrete additives are generally chlorides, but Article 276 of the “Code for the Construction and Acceptance of Reinforced Concrete” (GBJ10-65) mentions that 11 kinds of situations must not be mixed with chloride in reinforced concrete. How should this be understood? Is it possible to use additives containing rust inhibitors in prestressed concrete and in reinforced concrete structures using cold drawn steel and cold drawn low carbon steel wire? (Ma Xuezhong, Shaanxi Province) [Answer] The commonly used early strength agent for normal temperature construction is generally 0.5% table salt and 0.03% triethanolamine. In winter construction, it is blended with 1%.