Detecting Solidification Using Moisture Transport from Saturated Lightweight Aggregate

SP-259: Transition from Fluid to Solid: Re-Examining the Behavior of Concrete at Early Ages Pub Date : 2009-02-01 DOI:10.14359/56538

R. Henkensiefken, G. Sant, T. Nantung, J. Weiss

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引用次数: 10

Abstract

This paper describes how the propensity for early-age shrinkage cracking in low water cement (w/c) concretes has spawned the development of new technologies that can reduce the risk of cracking. One such technology is internal curing. Internal curing uses saturated lightweight aggregate to supply ‘curing water’ to low w/c paste as it hydrates. Significant research has been performed to determine the effects of internal curing on shrinkage and stress development in sealed samples. However, relatively little detailed information exist about how water is released from the lightweight aggregate to the surrounding cement paste. This study examines the timing of moisture release from saturated lightweight aggregate (LWA). Specifically this paper focuses on fluid transport around the time of set. X-ray absorption is used to trace the time at which water moves from the lightweight aggregate to the paste. X-ray observations are compared with results from the Vicat needle, autogenous shrinkage, and acoustic emission tests. These results are contextualized in terms of structure formation and vapor space cavitation in the cement paste.

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利用饱和轻骨料的水分输送检测凝固

本文描述了低水水泥(w/c)混凝土早期收缩开裂的倾向如何催生了可以降低开裂风险的新技术的发展。其中一项技术是内部固化。内部养护使用饱和轻骨料，在水化过程中为低w/c的膏体提供“养护水”。重要的研究已经进行，以确定内部固化对收缩和应力发展的密封样品的影响。然而，关于水如何从轻骨料中释放到周围的水泥浆中的详细信息相对较少。本研究考察了水分从饱和轻骨料(LWA)释放的时间。具体来说，本文关注的是凝固前后流体的输运。x射线吸收用来追踪水从轻骨料转移到浆料的时间。将x射线观察结果与维卡针、自收缩和声发射测试结果进行比较。这些结果是在水泥浆体结构形成和蒸汽空间空化方面的背景。

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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SP-259: Transition from Fluid to Solid: Re-Examining the Behavior of Concrete at Early Ages

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