AT缓凝高效减水剂(以下简称AT剂)具有对水泥适应性好、缓凝性合适、减水率大、早强和增强效果显著、塑化效果好等特点,适用于夏季施工、泵送砼、商品砼、道路砼、预制砼、滑模施工、大模板施工等场合。该剂在苏州雅都大酒店、苏州狮山大桥、上海金桥大厦、上海国际贸易大厦等工程中的六万立方米砼中应用,取得了加快施工进度、提高工程质量、加速模板及场地周转、节省水泥等多种效益。一、性能研究 AT剂为深褐色粉未状产品,其聚次甲基多环芳烃磺酸钠含量≥50％,硫酸钠含量 AT retarding superplasticizer (hereinafter referred to as AT agent) has the characteristics of good adaptability to cement, suitable retardation, large water reduction, early strength and reinforcing effect, good plasticizing effect, etc. It is suitable for summer construction and pumps. Send gongs, commodity gongs, road gongs, prefabricated gongs, slipform construction, large formwork construction and other occasions. The agent was applied to 60,000 cubic meters of concrete in Suzhou Yadu Hotel, Suzhou Shishan Bridge, Shanghai Jinqiao Building, Shanghai International Trade Building and other projects, and achieved accelerated construction progress, improved project quality, accelerated template and site turnover, Save cement and other benefits. First, the performance study AT agent is a dark brown powder product, its poly methyl polycyclic aromatic sodium content of ≥ 50%, sodium sulfate content