[1]糜人杰,潘钢华,李阳.外加剂与强化骨料对再生砂浆干缩值的影响[J].东南大学学报(自然科学版),2018,48(2):363-367.[doi:10.3969/j.issn.1001-0505.2018.02.027]
 Mi Renjie,Pan Ganghua,Li Yang.Effects of admixtures and intensified aggregates on drying shrinkage of recycled aggregate mortars[J].Journal of Southeast University (Natural Science Edition),2018,48(2):363-367.[doi:10.3969/j.issn.1001-0505.2018.02.027]
点击复制

外加剂与强化骨料对再生砂浆干缩值的影响()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
48
期数:
2018年第2期
页码:
363-367
栏目:
材料科学与工程
出版日期:
2018-03-20

文章信息/Info

Title:
Effects of admixtures and intensified aggregates on drying shrinkage of recycled aggregate mortars
作者:
糜人杰潘钢华李阳
东南大学材料科学与工程学院, 南京 211189; 东南大学江苏省土木工程材料重点实验室, 南京 211189; 东南大学江苏省协同创新中心, 南京 211189
Author(s):
Mi Renjie Pan Ganghua Li Yang
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
Jiangsu Collaborative Innovation Center, Southeast University, Nanjing 211189, China
关键词:
再生砂浆 强化骨料 外加剂 干缩值 数学模型
Keywords:
recycled aggregate mortars intensified aggregates admixtures drying shrinkage mathematical models
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2018.02.027
摘要:
为了降低再生砂浆(RAM)的干缩值(εat),采用外加剂(SSC)与强化骨料(IA)制备了RAM.研究了RAM的εat与龄期(T=2~91 d)之间的关系,提出了三段式的εat-T曲线,建立了相应的数学模型,并进行误差分析.探讨了取代率(R=30%,50%,70%,100%)对εat的影响,对比了RAM与RAM+SSC+IA的干缩值.结果表明: εat-T曲线由急缩段(2~7 d)、缓缩段(7~21 d)与稳缩段(21~90 d)组成,三段曲线可分别采用二次多项式函数、指数函数与指数函数作为数学模型.当R为30%与100%时,RAM+SSC+IA在急缩段的干缩值小于RAM;当R为50%与70%时,RAM+SSC+IA在急缩段前期的干缩值大于RAM,但在后期小于RAM;当R为30%~100%时,RAM+SSC+IA在缓缩段与稳缩段的干缩值小于RAM.SSC与IA可以降低RAM在急缩段后期、缓缩段与稳缩段的干缩值,并降低RAM在缓存缩段的膨胀率.
Abstract:
Drying shrinkage(εat)was reduced with admixtures(SSC)and intensified aggregates(IA)applied to recycled aggregate mortars(RAM). The relationships between curing time(T=2 to 91 d)and εat of RAM were studied. Meanwhile, εat-T curves of three-stages were put forward. Furthermore, the corresponding mathematical models were established, and relative standard errors and average relative errors were analyzed. The effects of replacement rate(R=30%, 50%, 70%, 100%)on εat, and εat of RAM and RAM+SSC+IA were discussed. The results show that the εat-T curves are divided into sharp shrinkage sections(2 to 7 d), slow shrinkage sections(7 to 21 d)and steady shrinkage sections(21 to 90 d). Meanwhile, quadratic polynomial functions, exponential functions and exponential functions are applied to the εat-T curves of three-stages, respectively. Furthermore, when R is 30% or 100%, εat of RAM+SSC+IA are lower than that of RAM at the sharp shrinkage sections. When R is 50% and 70%, εat of RAM+SSC+IA are higher than that of RAM at the early stages of sharp shrinkage sections, while εat of RAM+SSC+IA is lower than that of RAM at the later stages of sharp shrinkage sections. When R are 30% to 100%, εat of RAM+SSC+IA are lower than that of RAM at slow shrinkage sections and steady shrinkage sections. Finally, SSC and IA can reduce εat at the later stages of sharp shrinkage sections, slow shrinkage sections and steady shrinkage sections, and lower the expansion rate at the steady shrinkage sections.

参考文献/References:

[1] 李秋义,全洪珠.再生混凝土性能与应用技术 [M].北京:中国建材工业出版社,2010:1-9.
[2] Behera M, Bhattacharyya S K, Minocha A K, et al. Recycled aggregate from C&D waste & its use in concrete—A breakthrough towards sustainability in construction sector: A review[J]. Construction and Building Materials, 2014, 68: 501-516. DOI:10.1016/j.conbuildmat.2014.07.003.
[3] Sun Jiaying, Geng Jian. Effect of particle size and content of recycled fine aggregate on frost resistance of concrete[J]. Journal of Building Materials, 2012, 15(3): 382-385.
[4] Martínez I, Etxeberria M, Pavón E, et al. A comparative analysis of the properties of recycled and natural aggregate in masonry mortars[J]. Construction and Building Materials, 2013, 49: 384-392.DOI:10.1016/j.conbuildmat.2013.08.049.
[5] Zhang J, Shi C, Li Y, et al. Influence of carbonated recycled concrete aggregate on properties of cement mortar[J]. Construction and Building Materials, 2015, 98: 1-7. DOI:10.1016/j.conbuildmat.2015.08.087.
[6] 李秋义,李云霞,姜玉丹.再生细骨料质量标准及检验方法的研究 [J].青岛理工大学学报,2006,26(6):6-9.
  Li Qiuyi, Li Yunxia,Jiang Yudan.Study on the quality criterion and test measure of the recycled fine aggregate [J].Journal of Qingdao Technological University, 2006,26(6),6-9.(in Chinese)
[7] Tam V W Y, Tam C M, Le K N. Removal of cement mortar remains from recycled aggregate using pre-soaking approaches[J]. Resources, Conservation and Recycling, 2007, 50(1): 82-101. DOI:10.1016/j.resconrec.2006.05.012.
[8] Kong D, Lei T, Zheng J, et al. Effect and mechanism of surface-coating pozzalanics materials around aggregate on properties and ITZ microstructure of recycled aggregate concrete[J]. Construction and Building Materials,2010, 24(5): 701-708. DOI:10.1016/j.conbuildmat.2009.10.038.
[9] Spaeth V, Djerbi Tegguer A. Improvement of recycled concrete aggregate properties by polymer treatments[J]. International Journal of Sustainable Built Environment,2013, 2(2): 143-152. DOI:10.1016/j.ijsbe.2014.03.003.
[10] Cuenca-Moyano G M, Martín-Morales M, Valverde-Palacios I, et al. Influence of pre-soaked recycled fine aggregate on the properties of masonry mortar[J]. Construction and Building Materials, 2014, 70: 71-79. DOI:10.1016/j.conbuildmat.2014.07.098.
[11] 潘钢华,付明华,李阳.一种再生细骨料预拌砂浆专用外加剂及应用:中国,10261938.8 [P].2016-09-07.

备注/Memo

备注/Memo:
收稿日期: 2017-10-08.
作者简介: 糜人杰(1992—),男,博士生;潘钢华(联系人),男,博士,教授,博士生导师,ghpan@seu.edu.cn.
引用本文: 糜人杰,潘钢华,李阳.外加剂与强化骨料对再生砂浆干缩值的影响[J].东南大学学报(自然科学版),2018,48(2):363-367. DOI:10.3969/j.issn.1001-0505.2018.02.027.
更新日期/Last Update: 2018-03-20