PROBLEM TO BE SOLVED: To reduce the amount of gaseous ammonia generated from concrete at the stage of the production of a raw material by controlling the total amount of iron slag being mixed as a raw material and an additive for cement to be not more than a specified ratio and using, as gypsum to be added to the cement, titanium gypsum or desulfurization gypsum. SOLUTION: The total amount of iron slag being mixed as a raw material and an additive for cement is controlled to be not more than 70%. Paste samples are obtained by kneading cement and pure water in the ratio of 1:0.2 to 1:0.4 and are kept in a closed vessel at least three days. When the concentration of gaseous ammonia in the closed vessel is not more than 2 ppm, the cement is defined as the low gaseous ammonia generating cement. The low gaseous ammonia generating concrete is obtained by providing a composition composed of the cement generating a small amount of gaseous ammonia of 200 kg/m3 per unit weight, a fine aggregate from which an amount of =50 m/g of ammonium ion is eluted in an alkaline solution, and an AE water reducer or the like from which an amount of =100 m/g of ammonium ion is eluted in an alkaline solution and having the ratio of water to cement of 40 to 60%.
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机译：解决的问题：通过控制作为原料混合的铁渣和水泥添加剂的总量，使在原料生产阶段从混凝土中产生的气态氨的量不超过按规定比例使用钛石膏或脱硫石膏作为水泥中的石膏。解决方案：将铁渣作为原料和水泥添加剂混合的总量控制在不超过70％。糊状样品是通过将水泥和纯水以1：0.2至1：0.4的比例捏合而获得的，并在密闭容器中保存至少三天。当密闭容器中的气态氨的浓度不超过2ppm时，将水泥定义为低气态产生氨的水泥。通过提供由水泥组成的组合物来获得低气态产生氨的水泥，该组合物由每单位重量产生少量200 kg / m3的气态氨的水泥组成，细骨料的氨离子含量小于或等于50 m / g在碱溶液中洗脱，以及AE减水剂等，在碱溶液中从其中洗脱≤100 m / g的铵离子，水与水泥的比例为40％到60％。
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