[1] Mi Renjie, , Pan Ganghua, et al. Effects of admixture on properties of recycled aggregate mortar [J]. Journal of Southeast University (English Edition), 2020, 36 (3): 322-327. [doi:10.3969/j.issn.1003-7985.2020.03.010]

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

36

Issue:

2020 03

Page:

322-327

Research Field:

Materials Sciences and Engineering

Publishing date:

2020-09-20

Info

Title:

Effects of admixture on properties of recycled aggregate mortar

Author(s):

Mi Renjie¹;  2;  3;  4;  Pan Ganghua¹;  2;  3;  Li Yang¹;  2;  3

¹ School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
² Jiangsu Key Lab of Construction Materials, Nanjing 211189, China
³ Jiangsu Collaborative Innovation Center, Nanjing 211189, China
⁴ Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong 999077, China

Keywords:

construction and demolition waste;  recycled fine aggregate;  recycled aggregate mortar;  admixture

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2020.03.010

Abstract:

Compared with strengthening the recycled fine aggregate(RFA)from construction and demolition waste, which is time-consuming and complex, adding admixture into the mixtures directly is more efficient and effective to expand the application of recycled aggregate mortar(RAM). The admixture(named as SSC), mixed with sodium hexametaphosphate, sodium ligninsulfonate and citric acid, was directly added into the RAM. First, the compositions and physical properties of the RFA and reference aggregate were studied, respectively. The properties of fresh and hardened mortars were then investigated. The results show that there is a clear difference between the RFA and reference aggregate, and the properties of RAM without SSC are not as good as those of normal mortar. However, the consistency value, water retention rate, compressive strength and setting time values of RAM increase by 5%, 7%, 66% and 67%, and its consistency loss and density values decrease by 42% and 4% after the SSC is added into the RAM. Therefore, improving the properties of RAM through adding admixture is an effective and efficient approach to expanding its application.

References:

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Memo

Memo:

Biographies: Mi Renjie(1992—), male, Ph.D. candidate; Pan Ganghua(corresponding author), male, doctor, professor, ghpan@seu.edu.cn.
Foundation items: The Postgraduate Research and Practice Innovation Program of Jiangsu Province(No.KYCX18_0081), the Fundamental Research Funds for the Central Universities, the Scientific Research Foundation of Graduate School of Southeast University(No.YBPY1918), the National Key Research and Development Program of China(No.2017YFC0703100).
Citation: Mi Renjie, Pan Ganghua, Li Yang. Effects of admixture on properties of recycled aggregate mortar[J].Journal of Southeast University(English Edition), 2020, 36(3):322-327.DOI:10.3969/j.issn.1003-7985.2020.03.010.

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