Effect of Regenerated Micropowder on Properties of Dry Mixed Mortar

Abstract

Abstract: In order to promote the recycling and utilization of construction waste, the dry mixed mortar was prepared by replacing part of cement with regenerated micropowder, and the effects of the fineness, content and compounding ratio of the regenerated micropowder on the consistency, compressive strength, flexural strength and microstructure of the mortar were explored. The results show that the consistency of mortar decreases with the decrease ofregenerated micropowder particle fineness, the compressive strength and flexural strength of mortar at 28 d increase, and the strength reaches the maximum value after grinding for 40 h. With the increase of the content of regenerated micropowder, the consistency of mortar shows a downward trend, and the compressive strength and flexural strength of mortar at 28 d show a trend of increase first and then decrease. When the content of regenerated micropowder is 10% (mass fraction), the compressive strength reaches the maximum value. With the increase of the compounding ratio (mass ratio) of regenerated micropowder, the consistency of mortar shows a downward trend, and the compressive strength and flexural strength of mortar show a trend of increase first and then decrease. When the compounding ratio of micropowder milled for 20 h to unmilled micropowder is 6∶4, its compressive strength reaches the maximum value.

Key words: regenerated micropowder, dry mixed mortar, fineness, content, compounding ratio, mechanical property

CLC Number:

TU522

GAO Min, GUO Qilong, DU Lei, HUA Liang, LIU Ronghao, WANG Chunya, MA Zhitong. Effect of Regenerated Micropowder on Properties of Dry Mixed Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2851-2859.

References

[1] 徐东,徐波.建筑废弃物再生产品在市政工程中的应用技术研究[J].城市道桥与防洪,2017(12):214-215+218+21.
XU D, XU B. Study on application technique of building waste regeneration product in municipal engineering[J]. Urban Roads Bridges & Flood Control, 2017(12): 214-215+218+21 (in Chinese).
[2] 刘琼.再生微粉作为建筑垃圾再生利用新途径的探索[J].粉煤灰,2014,26(2):24-25.
LIU Q. New discovery into utilization of recycled micro powder: a kind of building wastes[J]. Coal Ash, 2014, 26(2): 24-25 (in Chinese).
[3] 张肖明,王丹,黄沛增.建筑垃圾再生微粉资源化利用研究现状[J].陕西建筑,2016(256):131-134.
ZHANG X M, WANG D, HUANG P Z. Research progress on the utilization of construction waste recycled micro powder[J]. Shaanxi Architecture, 2016(256): 131-134 (in Chinese).
[4] 田青,屈孟娇,张苗,等.废弃混凝土再生微粉激活方式研究进展[J].硅酸盐通报,2020,39(8):2476-2485.
TIAN Q, QU M J, ZHANG M, et al. Research progress on activation way of recycled micro powder of waste concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(8): 2476-2485 (in Chinese).
[5] 方军良,陆文雄,徐彩宣.粉煤灰的活性激发技术及机理研究进展[J].上海大学学报,2002,8(3):256-260.
FANG J L, LU W X, XU C X. Research progress on activation technology and mechanism of fly ash[J]. Journal of Shanghai University, 2002, 8(3): 256-260 (in Chinese).
[6] KIM Y J, CHOI Y W. Utilization of waste concrete powder as a substitution material for cement[J]. Construction and Building Materials, 2012, 30: 500-504.
[7] 樊耀虎,李滢,康晓明.再生微粉和粉煤灰对胶砂力学性能及微观结构影响研究[J].硅酸盐通报,2019,38(2):537-542.
FAN Y H, LI Y, KANG X M. Effect of recycled micro powder and fly ash on mechanical properties and microstructure of mortar[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(2): 537-542 (in Chinese).
[8] YU K Q, ZHU W J, DING Y, et al. Micro-structural and mechanical properties of ultra-high performance engineered cementitious composites (UHP-ECC) incorporation of recycled micro powder (RFP)[J]. Cement and Concrete Research, 2019, 124: 105813.
[9] 余小小,李如燕,董祥,等.机械力粉磨对再生微粉性能的影响[J].人工晶体学报,2017,46(4):688-692.
YU X X, LI R Y, DONG X, et al. Effect of mechanical force grinding on the properties of recycled micro powder[J]. Journal of Synthetic Crystals, 2017, 46(4): 688-692 (in Chinese).
[10] 徐如林.建筑垃圾粉料的活性激发及其应用[D].武汉:武汉理工大学,2011.
XU R L. Activation and application of construction waste powders[D]. Wuhan: Wuhan University of Technology, 2011 (in Chinese).
[11] 吕雪源,王乐生,陈雪,等.混凝土再生微粉活性试验研究[J].青岛理工大学学报,2009,30(4):137-139+179.
LV X Y, WANG L S, CHEN X, et al. Experimental study on the activity of concrete recycled micro powder[J]. Journal of Qingdao Technological University, 2009, 30(4): 137-139+179 (in Chinese).
[12] 於林锋.再生微粉在水泥中作用机理的试验研究[J].新型建筑材料,2017,44(7):108-111.
YU L F. Experimental study on action mechanism of recycled powder in cement[J]. New Building Materials, 2017, 44(7): 108-111 (in Chinese).
[13] CYR M, LAWRENCE P, RINGOT E. Efficiency of mineral admixtures in mortars: quantification of the physical and chemical effects of fine admixtures in relation with compressive strength[J]. Cement and Concrete Research, 2006, 36(2): 264-277.
[14] 高嵩,李秋义,李楠,等.基于最紧密堆积理论超密实再生砂浆制备研究[J].建筑结构学报,2021,42(s1):466-472.
GAO S, LI Q Y, LI N, et al. Research on super dense recycled mortar preparation based on densified parking theory[J]. Journal of Building Structures, 2021, 42(s1): 466-472 (in Chinese).
[15] 中华人民共和国住房和城乡建设部.混凝土和砂浆用再生微粉:JG/T 573—2020[S].北京:中国标准出版社,2020.
Ministry of Housing and Urban-Rural Developmentof the People's Republic of China. Recycled micro powder for concrete and mortar: JG/T 573—2020[S]. Beijing: Standards Press of China, 2020 (in Chinese).