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Study on modification of phosphate pretreated aggregate vegetation porous concrete

Abstract

To enhance the interfacial structure between aggregates and cementitious materials in vegetation porous concrete and improve its compressive strength, this paper investigates the effects of phosphate pretreatment on aggregate properties and the corresponding compressive strength of vegetation porous concrete. The performance of untreated aggregates, water-washed aggregates, and acid-treated aggregates was evaluated, and the modification mechanism was explored from the perspective of the interfacial transition zone (ITZ) using scanning electron microscopy (SEM). The results show that phosphate effectively removes impurities from the aggregate surface and increases surface roughness, thus improving the compactness and stability of the ITZ. After soaking the aggregates in phosphate for approximately 50 minutes, the 28-day compressive strength of the porous concrete prepared with acid-treated aggregates reached 16.47 MPa, which represents an 83% improvement compared to porous concrete made with untreated aggregates. Observations of the ITZ revealed that, unlike the loose and porous ITZ of untreated aggregate concrete, the ITZ of the acid-treated aggregate concrete exhibited jagged surface textures and greater compactness.

Publication Date

5-11-2023

DOI

10.14048/j.issn.1671-2579.2023.02.032

First Page

183

Last Page

188

Submission Date

March 2025

Reference

[1] 谢西, 姜成, 林晨彤, 等. 透水混凝土路面堵塞及其恢复效果研究[J]. 中外公路, 2019, 39(1): 46-49. XIE Xi, JIANG Cheng, LIN Chentong, et al. Research on clogging and effectiveness of restoration measures of permeable concrete pavement[J]. Journal of China & Foreign Highway, 2019, 39(1): 46-49. [2] 赵玉青, 邢振贤. 生态混凝土护坡技术与应用[M]. 北京: 中国水利水电出版社, 2016. ZHAO Yuqing, XING Zhenxian. Technology and application of ecological concrete slope protection[M]. Beijing: China Water & Power Press, 2016. [3] TANG W, MOHSENI E, WANG Z Y. Development of vegetation concrete technology for slope protection and greening[J]. Construction and Building Materials, 2018, 179: 605-613. [4] 王永海, 王伟, 周永祥, 等. 植生混凝土孔隙碱环境改善措施的试验研究[J]. 新型建筑材料, 2015, 42(1): 5-7. WANG Yonghai, WANG Wei, ZHOU Yongxiang, et al. Experimental research on improving measures of plant-growing concrete porous alkaline environment[J]. New Building Materials, 2015, 42(1): 5-7. [5] 高建明, 吉伯海, 吴春笃, 等. 植生型多孔混凝土性能的试验[J]. 江苏大学学报(自然科学版), 2005, 26(4): 345-349. GAO Jianming, JI Baihai, WU Chundu, et al. Experimental study on properties of green-growing porous concrete[J]. Journal of Jiangsu University (Natural Science Edition), 2005, 26(4): 345-349. [6] 王桂玲, 王龙志, 张海霞, 等. 植生混凝土的含义、技术指标及研究重点[J]. 混凝土, 2013(1): 105-109. WANG Guiling, WANG Longzhi, ZHANG Haixia, et al. Meaning, technology index and research emphases of planting eco-concrete[J]. Concrete, 2013(1): 105-109. [7] HUANG J L, LUO Z B, KHAN M B E. Impact of aggregate type and size and mineral admixtures on the properties of pervious concrete: An experimental investigation[J]. Construction and Building Materials, 2020, 265: 120759.

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