浸没硫酸钠溶液10年对再生骨料混凝土的长期硫酸盐侵蚀

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

Materiales de Construccion Pub Date : 2020-02-19 DOI:10.3989/mc.2020.06319

L. Santillán, F. Locati, Y. Villagrán-Zaccardi, C. Zega

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引用次数: 11

摘要

再生混凝土骨料（RCA）对混凝土抗外部硫酸盐侵蚀性能（ESA）的影响尚不完全清楚。本文对RCA含量分别为0、50、75和100%的再生骨料混凝土（RAC）在50g/l硫酸钠溶液中浸泡10年后进行了评估。通过湿化学分析和FRX获得硫酸盐侵入剖面。此外，还通过热重分析对入口剖面的矿物学进行了评估。最后，通过光学荧光显微镜图像分析评估了样品中微裂纹的发展。尽管RAC的硫酸盐进入量略有增加，但由于其较高的孔隙率（在50%或更高的置换率下，表面附近的SO3含量比对照混凝土高出约30%），即使RCA含量为100%，致密的新基质仍然允许RAC对外部硫酸盐侵蚀具有良好的性能。

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Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years

The effect of recycled concrete aggregate (RCA) on concrete performance against external sulfate attack (ESA) is not yet fully known. In this paper, recycled aggregate concretes (RAC) with 0, 50, 75 and 100% of RCA contents were evaluated after 10 years of exposure immersed in 50g/l sodium sulfate solution. Sulfate ingress profiles were obtained by wet chemical analyses and FRX. Also, the mineralogy of the ingress profile was evaluated by thermogravimetric analyses. Finally, microcracking development in samples was evaluated by optical fluorescent microscopy image analysis. Although RAC showed a slight increase in sulfate ingress, due to its higher porosity (about 30% higher SO3 content near the surface for 50% or higher replacement ratio than control concrete), a dense new matrix still allows a good performance of RAC to external sulfate attack with even 100% RCA content.

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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