[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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Effects of admixture on properties of recycled aggregate mortar()

外加剂对再生砂浆性能的影响

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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

外加剂对再生砂浆性能的影响

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

糜人杰¹;  2;  3;  4;  潘钢华¹;  2;  3;  李阳¹;  2;  3

¹ 东南大学材料科学与工程学院, 南京 211189; ² 江苏省土木工程材料重点实验室, 南京 211189; ³ 江苏省协同创新中心, 南京 211189; ⁴ 香港城市大学建筑与土木工程系, 中国香港 999077

Keywords:

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

建筑垃圾;  再生细骨料;  再生砂浆;  外加剂

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.

与操作复杂、耗时较长的再生细骨料强化方法相比, 直接在再生砂浆中添加外加剂可有效扩大再生砂浆在实际工程中的应用.采用六偏磷酸钠、木质素磺酸钠和柠檬酸混合制成外加剂SSC, 并将其直接添加到再生砂浆中.首先, 研究了再生细骨料和普通细骨料的组分和物理性能.其次, 对比了添加与未添加SSC再生砂浆的性能.结果表明:再生细骨料与普通细骨料存在显著的差异, 且未掺加SSC的再生砂浆性能比普通砂浆差.但是, 添加SSC后, 再生砂浆的稠度值、保水率、抗压强度和凝结时间分别增大了5%, 7%, 66%和67%, 且其稠度损失和密度分别降低了42%和4%.因此, 通过添加外加剂提高再生砂浆的性能, 可以有效地扩大再生砂浆在实际工程中的应用.

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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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