干湿循环作用下再生混凝土中硫酸盐传输性能研究

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发布时间：2020-01-06 00:00:00

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干湿循环作用下再生混凝土中硫酸盐传输性能研究

Research on Transmission Properties of Sulfate in Recycled Aggregate Concrete under Wetting-drying Cycles

２０17年第7期

再生混凝土；硫酸盐；干湿循环；硫酸根离子含量

Recycled aggregate concrete; Sulfate; Wetting-drying cycles; Sulfate ion content

２０17年第7期

1000-4637（2017）07-06-05

国家自然科学基金项目（51578141）；国家“973”计划项目（2015CB655102）

祁兵1,2 ，高建明1,2 ，沈达满1,2

东南大学材料科学与工程学院，南京 211189；2.东南大学江苏省土木工程材料重点实验室，南京 211189）

祁兵1,2 ，高建明1,2 ，沈达满1,2

祁兵,高建明,沈达满.干湿循环作用下再生混凝土中硫酸盐传输性能研究[J].混凝土与水泥制品,2017(7):6-10.

QI B, GAO J M, SHEN D M.Research on Transmission Properties of Sulfate in Recycled Aggregate Concrete Under Wetting-drying Cycles[J].China Concrete and Cement Products,2017(7):6-10.

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1000

摘要：研究了在干湿循环作用下，硫酸根离子在再生混凝土中的传输规律。采用分光光度计法定量表征不同深度处的水溶硫酸根离子浓度，研究再生粗骨料取代率（0，30%，50%，70%，100%）、矿物掺合料、水胶比、腐蚀龄期及干湿循环制度对其传输规律的影响。结果表明，再生粗骨料的掺入对硫酸盐传输有较为明显的影响。试验还表明，硫酸盐-干湿循环耦合作用下，粉煤灰和矿粉等矿物掺合料可阻碍硫酸根离子在再生混凝土中的传输，再生混凝土水胶比越小其水溶硫酸根离子浓度越小。随着腐蚀龄期增长，再生混凝土水溶硫酸根离子浓度大幅增加。与单一盐溶液侵蚀相比，干湿循环加剧了硫酸根离子在再生混凝土中的传输，其水溶硫酸根离子浓度随着循环次数的增加而增大。Abstract:Thetransmissionmechanismofsulfateioninrecycledaggregateconcretemadewithdifferentrecycledcoarseaggregate(RCA)undersulfateattackandwetting-dryingcyclesisinvestigatedinthispaper.Thewater-solublesulfateioncontentsaremeasuredbymeansofultra-violetandvisiblespectrophotometer.TheinfluencesofRCAreplacement,mineraladditions,w/bratio,erosiontimeandwetting-dryingregimeonthetransmissionmechanismofsulfateioninrecycledaggregateconcretearestudied.TheresultsindicatethattheincorporationofRCAshowsanobviousimpactontheresistanceofconcreteagainstsulfateattackunderwetting-dryingcycles.Additional,themineraladditionsmodifiedrecycledaggregateconcretehinderthetransmissionofsulfateionthanplainrecycledaggregateconcrete.Thewater-solublesulfateioncontentsdecreasewiththedecreaseofW/Bratio.Moreover,thewater-solublesulfateioncontentsincreasewiththetimeoferosionunderwetting-dryingcycles.Thewetting-dryingcycleshaveamajorimpactonthetransmissionmechanismofsulfateioninrecycledaggregateconcrete.Thewater-solublesulfateioncontentsincreasewiththenumberofwetting-dryingcycle.

英文名 : Research on Transmission Properties of Sulfate in Recycled Aggregate Concrete under Wetting-drying Cycles

刊期 : ２０17年第7期

关键词 : 再生混凝土；硫酸盐；干湿循环；硫酸根离子含量

Key words : Recycled aggregate concrete; Sulfate; Wetting-drying cycles; Sulfate ion content

刊期 : ２０17年第7期

DOI :

文章编号 : 1000-4637（2017）07-06-05

基金项目 : 国家自然科学基金项目（51578141）；国家“973”计划项目（2015CB655102）

作者 : 祁兵1,2 ，高建明1,2 ，沈达满1,2

单位 : 东南大学材料科学与工程学院，南京 211189；2.东南大学江苏省土木工程材料重点实验室，南京 211189）

祁兵1,2 ，高建明1,2 ，沈达满1,2

祁兵,高建明,沈达满.干湿循环作用下再生混凝土中硫酸盐传输性能研究[J].混凝土与水泥制品,2017(7):6-10.

QI B, GAO J M, SHEN D M.Research on Transmission Properties of Sulfate in Recycled Aggregate Concrete Under Wetting-drying Cycles[J].China Concrete and Cement Products,2017(7):6-10.

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摘要

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结论

参考文献

引用本文

Abstract: The transmission mechanism of sulfate ion in recycled aggregate concrete made with different recycled coarse aggregate (RCA) under sulfate attack and wetting-drying cycles is investigated in this paper. The water-soluble sulfate ion contents are measured by means of ultra-violet and visible spectrophotometer. The influences of RCA replacement, mineral additions, w/b ratio, erosion time and wetting-drying regime on the transmission mechanism of sulfate ion in recycled aggregate concrete are studied. The results indicate that the incorporation of RCA shows an obvious impact on the resistance of concrete against sulfate attack under wetting-drying cycles. Additional, the mineral additions modified recycled aggregate concrete hinder the transmission of sulfate ion than plain recycled aggregate concrete. The water-soluble sulfate ion contents decrease with the decrease of W/B ratio. Moreover, the water-soluble sulfate ion contents increase with the time of erosion under wetting-drying cycles. The wetting-drying cycles have a major impact on the transmission mechanism of sulfate ion in recycled aggregate concrete. The water-soluble sulfate ion contents increase with the number of wetting-drying cycle.

关键词:

再生混凝土；硫酸盐；干湿循环；硫酸根离子含量

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干湿循环作用下再生混凝土中硫酸盐传输性能研究

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