Chloride Ion Diffusion Resistance of Bulk Hydrophobic Concrete: Comparison of w/c and Dosages

IF 0.7 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Nordic Concrete Research Pub Date : 2023-07-01 DOI:10.2478/ncr-2022-0020
P. Rogers, J. Silfwerbrand, Anders Selander, J. Trägårdh, P. Utgenannt
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Abstract

Abstract Post-cast application of hydrophobic agents onto hardened concrete is successful at reducing external ion diffusion into cement paste, this work examines pre-cast application of hydrophobic admixtures in fresh concrete. Concretes, with water to cement ratios (w/c) 0.45 and 0.50 (CEM I; low C3A), were mixed. Adding alkyltrialkoxysilane or triacylglycerol admixtures ranging from 1 to 3 wt%cem in these concretes were evaluated. Increasing the dosage of hydrophobic admixtures decreased the compressive strength. The usage of these admixtures did not hinder the further development of the microstructure as all concretes gained strength after one year, but not in the same percentage increase as the reference concrete. Chloride ion diffusion, after exposure to 3 wt% NaCl solution at 20 °C for 91 days, in concretes with 1 wt%cem admixture showed slight reductions in diffusion rate (8-17%) compared to the reference. At 3 wt%cem, triacylglycerol admixtures showed better hindering effects of inward chloride diffusion, this was especially evident in w/c = 0.45. Equivalent addition of alkyltrialkoxysilane-based admixtures increased the diffusion of chloride ions transferred into the cement matrix.
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大块疏水混凝土的氯离子扩散阻力:w/c和用量的比较
摘要:浇筑后在硬化混凝土上应用疏水剂可以成功地减少外部离子扩散到水泥浆中,这项工作研究了在新混凝土中预制疏水外加剂的应用。混凝土,水灰比(w/c) 0.45和0.50 (CEM I;低C3A),混合。在这些混凝土中添加1 - 3wt %cem的烷基三烷氧基硅烷或三酰基甘油外加剂进行了评估。疏水外加剂用量增加,抗压强度降低。这些外加剂的使用并没有阻碍微观结构的进一步发展,因为所有混凝土在一年后都获得了强度,但与参考混凝土的增加百分比不同。氯离子在20°C下暴露于3 wt% NaCl溶液91天后,在掺有1 wt%cem的混凝土中,与对照相比,扩散速率略有降低(8-17%)。在3 wt%cem时,三酰甘油外加剂表现出更好的氯离子向内扩散的阻碍作用,这在w/c = 0.45时尤为明显。烷基三烷氧基硅烷基外加剂的等量添加增加了氯离子转移到水泥基体中的扩散。
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来源期刊
Nordic Concrete Research
Nordic Concrete Research CONSTRUCTION & BUILDING TECHNOLOGY-
自引率
20.00%
发文量
8
期刊最新文献
Load Effects of ASR-induced Expansion in Reinforced Concrete and Their Consequences for Structural Assessment A Review on Fatigue Performance of Concrete Structures Part II, Material Parameters and Environmental Factors Chloride Ion Diffusion Resistance of Bulk Hydrophobic Concrete: Comparison of w/c and Dosages Requirements for Test Series for Relative Humidity Measurements to Calibrate Drying Time Simulation Model Assessment of Effective and Minimal Slab Widths for Evaluating the Shear Capacity of RC Overhang Slabs
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