Properties of Methacrylic Water-Soluable Polymer as a Superplasticicer for Ultra High-Strength Concrete

M. Kinoshita, T. Suzuki, K. Soeda, T. Nawa
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引用次数: 8

Abstract

A technology to impart high fluidity to concrete with an extremely low W/C range of about 0.2 is required, in order to place ultra high-strength concrete with a compressive strength of over 100 MPa. For this purpose, the authors have developed a methacrylic water-soluable polymer as a superplasticizer (SSP) that imparts adequate workability and excellent cement dispersing capability to concrete mixtures with low W/C. Also, the high cement content of ultra high-strength concrete containing normal portland cement leads of high concrete temperature due to heat of hydration, posing problems of thermal cracking and low long-term strength. This study used a low-heat, belite-rich portland cement recently developed in Japan, together with powder silica fume to produce ultra high-strength concrete containing the SSP with a low water-binder ratio of approximately 0.2. As a result, the belite-rich portland cement was found to reduce the adiabatic temperature rise without causing set retardation when compared with normal portland cement. In addition, the concrete showed high fluidity as well as a high long-term compressive strength of over 150 MPa. These results suggest that the SSP is highly compatible with low-heat cement and is very effective in producing high-performance concrete when used in combination with this type of binder.
甲基丙烯酸水溶性聚合物作为超高强度混凝土增塑剂的性能研究
为了放置抗压强度超过100mpa的超高强度混凝土,需要一种使混凝土具有高流动性的技术,其W/C范围极低,约为0.2。为此,作者开发了一种甲基丙烯酸水溶性聚合物作为高效减水剂(SSP),为低W/C的混凝土混合物提供了足够的和易性和优异的水泥分散能力。另外,含普通硅酸盐水泥的超高强混凝土水泥含量高,导致混凝土水化热温度高,存在热裂和长期强度低的问题。本研究使用日本最近开发的一种低热、富含白来石的硅酸盐水泥,与粉硅灰一起生产含有SSP的超高强度混凝土,水胶比低,约为0.2。结果表明,与普通硅酸盐水泥相比,富白石硅酸盐水泥在降低绝热温升的同时,不产生凝块阻滞。此外,混凝土表现出高流动性和高的长期抗压强度,超过150mpa。这些结果表明,SSP与低热水泥高度相容,当与这种类型的粘合剂结合使用时,可以非常有效地生产高性能混凝土。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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