《Materials in Civil Engineering》杂志刊登“不同欧洲水泥在养护期和养护后期对保护层混凝土水化过程的影响”

作者：W. J. McCarter; G. Starrs; A. Adamson; T. M. Chrisp; P. A. M. Basheer；S. Nanukuttan; S. Srinivasan; and C. Green

刊物：《Materials in Civil Engineering》，25卷第9期，1335-1343页

关键词：混凝土；保护层；水化反应；辅助性胶结材料；监测；电阻

摘要：钢筋混凝土结构的耐久性主要依赖于保护层的混凝土，保护层混凝土的作用是保护钢筋使其与外部环境隔离。本文使用离散化的电性质测量方法来研究养护期以及养护后期与保护层厚度相关的特征，从而可以进行保护层保护能力的综合评估。测试过程主要是把小的多电极阵列嵌入到75mm混凝土试样的表面。混凝土由不同欧洲水泥按照不同水灰比制成。混凝土的最小厚度必须满足钢筋不暴露到环境包括氯化物中的要求。在养护期超过300天后，对其进行电阻测量，电阻测量结果可以表现出正在进行的水化过程，硬凝作用，和孔隙结构细化；此外，在养护后期，将试件暴露到一个循环的氯化物区域中时，应该使用电阻测量研究表面层的对流区域和离子浓缩。

Influence of Different European Cements on the Hydration of Cover-Zone Concrete during the Curing and Postcuring Periods

Authors: W. J. McCarter; G. Starrs; A. Adamson; T. M. Chrisp; P. A. M. Basheer；S. Nanukuttan; S. Srinivasan; and C. Green

Journal:《Materials in Civil Engineering》，Volume 25, Number 9,1335–1343

Key words：Concrete; Cover zone; Hydration; Supplementary cementitious materials; Monitoring; Electrical resistivity

Abstract: The durability of reinforced concrete structures depends, in the main, on the performance of the cover-zone concrete, which protects the steel from the external environment. This paper focuses on the use of discretized electrical property measurements to study depth-related features during both the curing and postcuring period, thereby allowing an integrated assessment of the protective properties of the cover region. In the current work, use is made of a small, multielectrode array embedded within the surface 75 mm of concrete specimens. Concretes were manufactured with different European cements (CEM) and water/binder ratios representing mixes that satisfied the minimum requirements for a range of environmental exposure classes, including exposure to chlorides. Electrical resistance measurements were taken over a period in excess of 300 days which showed ongoing hydration, pozzolanic reaction, and pore-structure refinement; in addition, in the postcuring period, when exposed to a cyclic chloride ponding regime, measurements could be used to study the convective zone and ionic enrichment of the surface layer.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29MT.1943-5533.0000678