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一、前言由于亚硝酸钠短缺而昂贵,一时难于满足施工需要,为此我公司于80年冬采用尿素作为砼附掺剂,应用于三栋住宅柚圈梁中,以减轻亚硝酸钠供求紧张。经一年实际观察和试验,尚未发现砼在其强度、裂纹、钢筋锈蚀等方面有大的庇漏,基本满足施工与设计要求。今年又应用于住宅的圈梁及部分非重要钢筋砼结构中,并准备观察后决定取舍。砼掺用尿素后的物理力学性能和抗冻增强机
I. INTRODUCTION Due to the shortage of sodium nitrite and its high cost, it is difficult to meet the construction requirements at one time. For this reason, our company adopted urea as an anthraquinone admixture in winter of the year 80 and applied it to three residential buildings in grapefruit ring beams to reduce tension and supply of sodium nitrite. . After one year of actual observation and testing, it has not been found that there is a large leak in its strength, cracks, steel corrosion, etc., which basically meets the requirements for construction and design. This year, it was applied to residential beams and some non-important reinforced concrete structures, and it was prepared to observe and decide to choose. Physico-mechanical properties and anti-freeze enhancement machine after adding urea