聚羧酸减水剂分子最基本的结构单元为聚乙氧基(-OCH_2CH_2-)、羧基(-COO-),通过引入其它活性基因可以优化其的性能。在保持主要分子结构不变的情况下,选择适当的改性剂A、B、C,通过接枝共聚,引入不同功能的官能团,可以明显改善减水剂与水泥的适应性。实验结果表明:引入10%的改性剂A可以明显提高减水率,抑制流动性损失;引入5%的改性剂B,可以明显抑制高C_3S水泥水化,增加流动保持性;引入2%改性剂C可以明显提高减水剂的引气、保水性能 The most basic structural units of polycarboxylic acid water reducer molecules are poly-ethoxy (-OCH 2 CH 2 -), carboxyl (-COO-), which can be optimized by the introduction of other active genes. Under the circumstance of keeping the main molecular structure unchanged, selecting suitable modifiers A, B, and C, and introducing functional groups with different functions through graft copolymerization can significantly improve the adaptability of water-reducing agent and cement. The experimental results show that the introduction of 10% Modifier A can significantly increase the water reduction rate and suppress the loss of fluidity. The introduction of 5% Modifier B can significantly inhibit the hydration of high C 3S cement and increase the fluidity retention. Modifier C can significantly improve the bleed air and water retention properties of water reducer