一种独特的灌浆抗冲蚀添加剂的实验室评价

J. Bury, H. Farzam
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引用次数: 3

摘要

在水下铺设混凝土的新建筑或现有结构的修复带来了一定的挑战,需要特殊的铺设技术,更具体地说,需要特殊的混合比例。基于各种水溶性聚合物的抗冲刷外加剂(AWA)已被开发用于水下混凝土,以减少水泥冲刷并提供令人满意的原位混凝土质量。这些外加剂通过结合自由混合水或通过增强颗粒间的吸引力来形成具有粘性的糊状相。因此,他们正在寻找其他用途,如隔离或放血控制剂,以及粘度调节剂。最近,在阿拉巴马州的一个大坝修复项目中出现了对粘度改进剂的需求,该项目正在放置灌浆幕以控制大坝下的渗流。为了验证在该项目的浆液混合物中使用AWA的可行性,在实验室进行了初步研究,研究了一种用于水下混凝土的独特纤维素基液体AWA处理的流体浆液的性能。本文介绍了这种独特的AWA对流体和可流动浆料塑性性能的影响。结果表明,该掺合料可以改善浆液黏度,降低浆液出血特性,提高浆液和可流动浆液混合物的抗冲蚀性。可能受益于这些改进的应用包括:潮带注浆抛石;并放置灌浆帷幕,以尽量减少大坝下的渗水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Laboratory Evaluation of a Unique Anti-Washout Admixture in Grouts
New construction or repair of existing structures dealing with the placement of concrete underwater poses certain challenges that require special placement techniques, and more specifically, specialized mixture proportions. Anti-washout admixtures (AWA), based on water-soluble polymers of various types, have been developed for use in concrete placed underwater in order to minimize cement washout and provide in-place concrete of satisfactory quality. These admixtures create a cohesive paste phase either by binding free mix water or by enhancing interparticle attraction. Hence, they are finding additional uses such as segregation or bleed control agents, and viscosity modifiers. Recently, the need for a viscosity modifying agent arose in a dam rehabilitation project in Alabama where a grout curtain was being placed to control seepage under the dam. To verify the feasibility of using an AWA in the grout mixtures for this project, a preliminary study was performed in the laboratory to investigate the performance of fluid grouts treated with a unique cellulose-based liquid AWA developed for underwater concreting. The effect of this unique AWA on the plastic properties of fluid and flowable grouts are presented in this paper. The results indicate that it is possible to use this admixture to modify grout viscosity, minimize bleeding characteristics, and improve washout resistance of fluid and flowable grout mixtures. Applications that might benefit from these improvements include: grouting riprap in tidal zones; and placement of grout curtains to minimize water seepage under dams.
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