外部硫酸盐和氯化物的加速作用研究钢筋混凝土中抗拉钢的腐蚀

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Materiales de Construccion Pub Date : 2017-10-05 DOI:10.3989/MC.2017.10116

M. Silva, M. Cunha, A. Pinho-Ramos, B. S. D. Fonseca, F. Pinho

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引用次数: 4

摘要

钢筋的腐蚀可能导致钢筋混凝土结构强度的显著损失。该研究的重点是加速这种腐蚀，并检查以下方面的退化：（i）在潮湿的环境中，硫酸钠导致混凝土抗压强度下降；和（ii）通过硫酸钠和氯化钠溶液的弯曲强度。使用了三种类型的混凝土，不同的梁试样由不同直径（6、8和10mm）的钢筋加固，部分梁是预裂的。强度最低的混凝土在整个过程中允许更高的硫酸盐渗透，抗压强度略有增加，这可能是由于污染后混凝土的孔隙率较低。弯曲试验的结果表明，在所有情况下强度都有所下降。预裂梁受混凝土孔隙率的影响较小。具有6mm钢筋的梁由于污染和腐蚀过程而表现出最大的强度损失

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Accelerated action of external sulfate and chloride to study corrosion of tensile steel in reinforced concrete

Corrosion of the reinforcing steel may cause significant loss of strength of reinforced concrete structures. The study focuses on accelerating such corrosion and examining the degradation of (i) the compressive strength of concrete due to sodium sulfate in a wet atmosphere; and (ii) the flexural strength by a solution of sodium sulfate and sodium chloride. Three types of concrete were used and different beam specimens were reinforced by steel rebars of different diameters (6, 8 and 10mm), part of the beams being pre-cracked. The concrete with least strength allowed higher sulfate penetration along the entire process and the compressive strength increased slightly, possibly due to lower porosity of concrete after contamination. The results of the flexural tests showed decrease of strength in all cases. Pre-cracked beams exhibited smaller influence of porosity of concrete. Beams with 6mm rebars showed the largest loss of strength due to the contamination and corrosion process

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来源期刊

Materiales de Construccion 工程技术-材料科学：综合

CiteScore

3.20

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Materiales de Construcción is a quarterly, scientific Journal published in English, intended for researchers, plant technicians and other professionals engaged in the area of Construction, Materials Science and Technology. Scientific articles focus mainly on: - Physics and chemistry of the formation of cement and other binders. - Cement and concrete. Components (aggregate, admixtures, additions and similar). Behaviour and properties. - Durability and corrosion of other construction materials. - Restoration and conservation of the materials in heritage monuments. - Weathering and the deterioration of construction materials. - Use of industrial waste and by-products in construction. - Manufacture and properties of other construction materials, such as: gypsum/plaster, lime%2