低湿度半浸泡环境下粉煤灰对砂浆试件硫酸盐侵蚀性能的影响

doi:10.11896/cldb.19100202

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Abstract Cement mortars containing 0%, 15%, 30%, and 45% of fly ash were partially immersed in 5wt% Na₂SO₄ solution for 180d corrosion experiments in T=(20±3) ℃, RH=(35±5)% of relative low humidity environment. The pore structure, capillary sorptivity transportation characteristics, SO₄^2- concentration and volume-loss and mass-loss of the mortars before and after erosion were analyzed, the erosion products were characterized by XRD and SEM. The results show that with the increase of fly ash content for mortars increase the proportion of capillary pores, results in a significant increase in capillary sorptivity transmission characteristics and causes higher SO₄^2- concentration in crystallization zone. The sample without fly ash PO sample, after erosion for 180 days, except for sodium sulfate, the erosion products in the salt crystallization zone of the mortar specimen form more gypsum phase, the main reason for the destruction of the salt crystallization zone of the mortars is chemical erosion. While the sample addition with fly ash samples, the products of salt crystallization zone of sample has only sodium sulfate, and no gypsum obviously. And with the increase of the amount of fly ash, the damage of the mortar specimen is more serious, and shows as more severe physical salt attack, results in much more serious mass-loss of the mortar specimen. It indicates that the mortars with the increase of the amount of fly ash specimen can refine the pores. In the low humidity environment, it will increase the capillary sorptivity transmission rate of the sulfate solution and caused more serious physical salt crystal damage.

Key words： low humidity partially immersion sulfate attack fly ash erosion mechanism physical sulfate attack

Published: 14 July 2020

CLC number:

TU528

Fund:This work was financially supported by the National Natural Science Foundation of China (51578004, 51608004, 51778003), Natural Science Foundation of Anhui Provincial Department of Education (KJ2018JD18), Ph.D Research Startup Foundation of Anhui Jianzhu University (2018QD49).

About author:: Daosheng Sunreceived his B.E. degree in building materials and products from Chongqing University in 1986 and received his Ph.D. degree in materials from the Nanjing Tech University in 2004. He was granted professor in 2005. He is the tutor of Anhui Jianzhu University and Hefei Institute of Physical Science, Chinese Academy of Sciences. He is the member of Anhui Silicate Society, Anhui Cement Standardization Technical Committee and Anhui Cement Association. His research interests include high performance concrete, comprehensive utilization of solid waste, and advanced building materials.
Kaiwei Liureceived his Ph.D. degree in materials from Nanjing Tech University in 2014. He has hosted and participated in 10 provincial or ministerial level research projects including National Natural Science Foundation of China (General Program), Natural Scie-nce Foundation of Higher Education of Anhui Province (Key Program), Open Project of State Key Laboratory of High Performance Civil Engineering Materials, Open Project of State Key Laboratory of Materials and Chemical Engineering, and Open Project of Anhui Jianzhu University, and so on. He also participated in the preparation of “Cement and Concrete Materials in Marine Engineering”. His research interests are comprehensive utilization of solid waste and advanced building materials.

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	SUN Daosheng
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Cite this article:

SUN Daosheng,WANG Hui,LIU Kaiwei, et al. Effect of Fly Ash on Performance of Mortars Partially Exposed to Sulfate Solution Under Low Humidity[J]. Materials Reports, 2020, 34(14): 14079-14086.

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http://www.mater-rep.com/EN/10.11896/cldb.19100202 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14079

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