Development of new superplasticizer made of comb-like polymer for high-performance concrete

本研究的目标是开发一种新的超塑性机，用于高性能混凝土，如高强度混凝土和自compacting混凝土。我们已经应用了一种类似于comb的共聚物，用接枝链制成了一种新开发的超塑性剂。在这项研究中，我们研究了几种因素的影响，如水泥、温度和混合条件对水泥流动性的影响，以优化聚合物的化学结构。Moreover，新混凝土的特性也是在按顺序测试以核实粘贴测试的结果。最重要的发现是最简单的，如以下所示;（1）聚合物对聚合物的流动性依赖标记的化学结构的影响。在以马来酰亚胺为基础的共聚物的情况下，流动性更好，而聚乙烯氧化物链的长度更短。在对立面中，在甲基丙烯酸基共聚物的情况下，流动性更好， ... More 更长的长度的聚乙烯氧化物链变成了。（2）由于聚合物接枝链的长度上的水解降解而增加，而延迟的程度则不同地依赖于主链聚合物的类型。在基于马来酰亚胺的共聚物的情况下，酸盐的氢化（3CaO·SiOyy D22 yie D2）在水泥被禁止的时候，聚氧乙烯接枝链的长度是短的。在另一只手上，在甲基丙烯酸基共聚物的情况下，酸盐的氢化并不明显地被抑制，而且没有对聚氧乙烯接枝链的长度进行管制。（3）水泥浆含有梳状聚合物的流动性，是甲基丙烯酸的主要链，并不容易受到所用水泥、温度和混合条件的影响。（4）新鲜的混凝土指示了水泥浆的相同趋势;移植链的长度更长，混凝土的流动性、隔离抵抗性、传递性和自我兼容性更好。从本研究的结果中，我们总结了一个类似梳的甲基共聚物，一个长的移植链在两个流体和强度发展的条款中具有最有效的化学结构。这是可能的，因为我们可以很容易地生产高性能的混凝土，使用类似梳状的甲基丙烯酸共聚物，即使在使用的水泥种类、温度和混合条件各不相同的情况下。Less（低）

The purpose of this study is to develop new superplasticizer for high-performance concrete such as high-strength concrete and self-compacting concrete. We have applied the comb-like copolymer having graft chain made of polyethylene oxide to newly developed superplasticizer. In this study, we investigated the effect of several factors such as kinds of cement, temperature and mixing condition on the fluidity of cement paste in order to optimize the chemical structure of comb-like copolymer. Moreover, the properties of fresh concrete were also examined in order to verify the results of paste test.The most important findings are summarized as follows;(1) The effect of chemical structure of copolymer on the fluidity of paste depended markedly on the kind of main polymer. In case of maleic anhydride based copolymer, the better the fluidity was, the shorter the length of polyethylene oxide chains became. In the opposite, in case of methacrylic based copolymer, the better the fluidity was, the … More longer the length of polyethylene oxide chains became.(2) The delay of the hydration decreased with an increase in the length of polyoxyethylene graft chain, an the degree of the delay was different depending on the kind of the main chain polymer. In case of maleic anhydride based copolymer, the hydration of alite (3CaO・SiOィイD22ィエD2) in cement inhibited remarkably when the length of polyoxyethylene graft chains was short. On the other hand, in case of methacrylic based copolymer, the hydration of alite was not inhibited significantly, regardless of the length of polyoxyethylene graft chains.(3) The fluidity of cement paste containing comb-like polymer, of which main chain makes of the methacrylic acid, was not affected easily by the kinds of cement used, temperature and mixing condition.(4) Fresh concrete indicated the same tendency of the cement paste; the longer the length of graft chains became, the better were the flowability, segregation resistance, passing ability and self-compactability of concrete.From the results in this study, we conclude that the comb-like methacrylic copolymer with a long graft chain has the best efficient chemical structure in terms of both fluidity and strength development. Thus it is possible that we can produce easily the high performance concrete by using the comb-like methacrylic copolymer with a long graft chain even when the kinds of the cement used, temperature and mixing conditions are varied. Less