Abstract：To investigate the transportation mechanism of chloride ion in manufactured sand concrete (MSC), the chlorine salt erosion tests under dry-wet cycle were carried out under the conditions of different sand replacement rate, fly ash content and stone powder content. The mass fraction of free chloride ions and diffusion coefficient of chloride ions in concrete were obtained by the experiments. The results show that with the increasing of manufactured sand (MS) replacement, the chloride concentration at the same concrete depth and chloride diffusion coefficient of concrete is decreased with latter increasing. The concrete with 50% manufactured sand has the highest resistance performance to chloride ion penetration. With the increasing of fly ash content, the chloride penetration resistance of manufactured sand concrete is increased with latter decreasing. The manufactured sand concrete with 30% fly ash can resist the chloride penetration with the best effect. Compared with the MS without or containing 11.6% stone powder, the chloride ion erosion resistance of concrete with 5.8% stone power is the strongest. Proper amount of manufactured sand in concrete can improve the durability life of concrete in the dry-wet cycle of chloride solution.
延永东， 王鑫， 陆春华， 陶松涛， 季光前. 干湿循环下机制砂粉煤灰混凝土的抗氯离子侵蚀性能[J]. 江苏大学学报（自然科学版）, 2023, 44(6): 731-737.
Resistance of manufactured sand concrete with fly ash to chloride ion attack under dry-wet cycle. Resistance of manufactured sand concrete with fly ash to chloride ion attack under dry-wet cycle
[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2023, 44(6): 731-737.
LIU M H, WANG X Y, LIU X, et al. Study on modification effect of calcium sulfate whiskers on stone power content of manufactured sand concrete[J]. China Civil Engineering Journal, 2021, 54(5):56-64.（in Chinese）
YU B T, LIU T,WANG H, et al. Influence of granite porphyry stone powder content on porperties and microstructure of concrete[J].Journal of Jilin University(Engineering and Technology Edition)，DOI： 10.13229/j.cnki.jdxbgxb20200963.（in Chinese）
YAN J J, YE X S, LI Y C, et al. Influence of stone dust content in manufactured sand on properties of concrete with volcanic ash incorpoated[J]. Journal of Materials Science and Engineering,2019,37(5):828-832.（in Chinese）
LI B X,YIN L Y, FENG Z H, et al. Study on the effects of rock dust content on the durability of C60 ma-nufactured sand marine concrete[J]. Concrete, 2017(10):169-173.（in Chinese）
YANG Z Q, LIU Y Z. Effect of stone powder content on strength and durability of high performance concrete with machine-made sand[J]. Concrete, 2018（7）: 69-75.（in Chinese）
XU Z H, DENG J S, LIU Z A, et al. Study on the influence law of MB value of microfines in manufactured sand on concrete performances[J].Journal of Wuhan University of Technology(Transportation Science & Engineering)，2021,45（6）：1151-1157.（in Chinese）
LI Z Y, ZHOU Y J, QIN M Q, et al. Experimental study of tuff manufactured sand on chloride resistance of marine concrete[J].Bulletin of the Chinese Ceramic Society,2015,34(4):955-959.（in Chinese）
［9］
胡蝶. 机制砂混凝土的工作性能、力学性能及抗氯离子侵蚀性能研究[D].广州：广州大学, 2018.
［10］
BOURGUIBA A, GHORBEL E, CRISTOFOL L, et al. Effects of recycled sand on the properties and durability of polymer and cement based mortars[J]. Construction and Building Materials, 2017, 153: 44-54.
PENG J X, WU T T, HU S W, et al. Effect of chlorides diffusion and its spatial probability analysis of prestressed concrete bridge under chloride environment[J]. China Journal of Highway and Transport,2016,29(4):50-58.（in Chinese）
JIN Z Q, SUN W, ZHAO T J, et al. Chloride binding in concrete exposed to corrosive solutions[J]. Journal of the Chinese Ceramic Society, 2009, 37(7): 1068-1072, 1078.（in Chinese）
［14］
姚昌建.沿海码头混凝土设施受氯离子侵蚀的规律研究[D].杭州：浙江大学,2007.
［15］
徐鹏飞. 氯盐环境下纳米强化再生骨料混凝土梁耐久性能提升研究[D].镇江：江苏大学,2020.
［16］
ENGELUND S, EDVARDSEN C, MOHR L. General Guidelines for Durability Design and Redesign[M]. Brussels, Belgium: European Commission, 2000.
