再生粗骨料硅烷浸渍处理对混凝土介质传输性能的影响

鲍玖文; 李树国; 张鹏; 赵铁军

doi:10.13801/j.cnki.fhclxb.20200316.002

再生粗骨料硅烷浸渍处理对混凝土介质传输性能的影响

doi: 10.13801/j.cnki.fhclxb.20200316.002

鲍玖文^{1, 2,},
李树国^1,,
张鹏^1, ,,
赵铁军^1,

1.
青岛理工大学　土木工程学院，青岛 266033
2.
大连理工大学　海岸和近海工程国家重点实验室，大连 116024

基金项目: 国家自然科学基金(51908307；51922052；51778309)；山东省自然科学基金(ZR2018JL018)；山东省“双一流”建设工程-土木；大连理工大学海岸和近海工程国家重点实验室开放课题(LP1902)

详细信息

通讯作者:
张鹏，博士，教授，博士生导师，研究方向为混凝土耐久性　E-mail：peng.zhang@qut.edu.cn

中图分类号: TU528.01
计量
- 文章访问数: 1149
- HTML全文浏览量: 323
- PDF下载量: 55
- 被引次数: 0
出版历程
- 收稿日期: 2019-11-19
- 录用日期: 2020-01-20
- 网络出版日期: 2020-03-16
- 刊出日期: 2020-10-15

Effect of recycled coarse aggregate after strengthening by silane impregnation on mass transport of concrete

BAO Jiuwen^{1, 2
,},
LI Shuguo^1
,,
ZHANG Peng^{1
, ,},
ZHAO Tiejun^1
,

1.
Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
2.
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 由于残余砂浆的存在，再生粗骨料的物理力学指标远不及天然骨料，致使再生混凝土力学和耐久性能较差；此外，水分及有害离子侵入混凝土内部是引起混凝土材料性能劣化的主要原因。本试验用质量分数为8wt%的硅烷乳液浸渍强化再生粗骨料，通过抗压强度、毛细吸水和抗氯离子侵蚀试验对硅烷浸渍前后不同骨料质量取代率(0%、30%、50%)的再生混凝土介质传输性能进行了研究，最后利用SEM对再生混凝土内部的微观结构进行分析。试验结果表明，硅烷浸渍处理再生粗骨料的吸水率显著降低，由其制备的混凝土强度稍有所下降；再生混凝土毛细累积吸水量明显减少，且抗氯盐侵蚀性能显著提高，其中骨料质量取代率为50%的再生混凝土浸渍处理后氯离子扩散系数降低了37.5%。研究表明，硅烷浸渍处理再生粗骨料是提高再生混凝土耐久性的有效途径。
- 再生混凝土 /
- 骨料强化 /
- 硅烷浸渍 /
- 毛细吸水 /
- 抗氯盐侵蚀
Abstract: The physical index of recycled coarse aggregate is far lower than that of natural coarse aggregate due to the existence of residual mortar, which leads to the poor mechanical properties and durability of recycled aggregate concrete (RAC). Furthermore, the ingress of water and aggressive ion is the main cause of the degradation of concrete properties. The durabilities of concrete with various replacement ratios by mass of recycled concrete aggregate(0%, 30%, 50%), which has been impregnated by 8wt% silane, were studied through a series of tests, including the compressive strength, capillary water absorption and chloride penetration depth. Finally, the microstructure of the recycled concrete was analyzed by SEM. The experimental results show that the water absorption rate of the recycled coarse aggregate treated by silane impregnationis decreases significantly, and the compressive strength of the recycled concrete prepared by silane decreases slightly. Moreover, the capillary water absorption of the modified recycled concrete is obviously reduced while the chloride penetration resistance is significantly increased. The chloride diffusion coefficient of the treated recycled concrete with the aggregate replacement ratio by mass of 50% is reduced by 37.5%. This research indicates that the recycled coarse aggregate impregnated by silane is an effective way to improve the durability of the recycled aggregate concrete.
- recycled aggregate concrete /
- strengthened aggregate /
- silane impregnation /
- capillary absorption /
- chloride penetration resistance

HTML全文

图 1 粗骨料颗粒级配

Figure 1. Particle size distribution of coarse aggregate

下载: 全尺寸图片幻灯片

图 2 混凝土制作搅拌流程示意图

Figure 2. Schematic view of mixing procedure of concrete

下载: 全尺寸图片幻灯片

图 3 养护龄期对硅烷浸渍后再生混凝土抗压强度的影响

Figure 3. Effect of curing age on compressive strength of recycled aggregate concrete

下载: 全尺寸图片幻灯片

图 4 不同骨料类型再生混凝土毛细吸水质量

Figure 4. Capillary water absorption of recycled aggregate concrete with different aggregate types

下载: 全尺寸图片幻灯片

图 5 浸渍强化处理再生粗骨料混凝土吸水率

Figure 5. Sorptivity of recycled aggregate concrete impregnated by saline

下载: 全尺寸图片幻灯片

图 6 再生混凝土内部氯离子含量分布

Figure 6. Chloride profiles of recycled aggregate concrete

下载: 全尺寸图片幻灯片

图 7 再生混凝土的氯离子扩散系数

Figure 7. Chloride diffusivity of recycled aggregate concrete

下载: 全尺寸图片幻灯片

图 8 再生混凝土SEM图像和EDS分析

Figure 8. SEM images and EDS analysis of recycled aggregate concrete

下载: 全尺寸图片幻灯片

表 1 粗骨料物理指标

Table 1. Physical indexes of coarse aggregates

Coarse aggregate	Moisture content/ %	Water absorption/ %	Crushing index/ %	Apparent density/ (kg·m⁻³)
NCA	0.42	1.5	11.2	2 610
RCA	3.1	6.8	15.1	2 597
RCAS	3.0	4.2	13.8	2 547
Note：RCAS—Recycled coarse aggregate impregnated by silane.

下载: 导出CSV

表 2 再生混凝土配合比

Table 2. Mix proportions of recycled aggregate concretes

No.	m_W/ m_C	Material/(kg·m⁻³)
No.	m_W/ m_C	Water	AW	SP	Cement	Sand	NCA	RCA	RCAS
R0	0.4	152	−	2.28	380	627	1 269	−	−
RCA30/R0	0.4	152	14.2	2.28	380	627	888.3	380.7	−
RCAS30/R0	0.4	152	4.7	2.28	380	627	888.3	−	380.7
RCA50/R0	0.4	152	23.6	2.28	380	627	634.5	634.5	−
RCAS50/R0	0.4	152	7.8	2.28	380	627	634.5	−	634.5
Notes：R0, RCA30/R0 and RCA50/R0—Concrete with RCA substitution rates of 0, 30% and 50%; RCAS30/R0 and RCAS50/R0—Concrete with RCAS substitution rates of 30% and 50%; m_W and m_C—Mass of water and cement; AW and SP—Additional water and superplasticizer.

下载: 导出CSV

参考文献(31)

[1]	KOU S, ZHAN B, POON C. Use of a CO₂ curing step to improve the properties of concrete prepared with recycled aggregates[J]. Cement and Concrete Composites,2014,45:22-28. doi: 10.1016/j.cemconcomp.2013.09.008
[2]	林腾玮, 刘孙涛, 罗素蓉, 等. 纳米SiO₂改性再生混凝土抗氯离子的渗透性能实验[J]. 福州大学学报(自然科学版), 2019, 47(4):533-537. LIN Tengwei, LIU Suntao, LUO Surong, et al. Experimental study on chlorine ion penetation resistance of nano-SiO₂ modified recycled concrete[J]. Journal of Fuzhou University(Natural Science Edition),2019,47(4):533-537(in Chinese).
[3]	陈爱玖, 王静, 马莹. 钢纤维橡胶再生混凝土的抗冻性试验[J]. 复合材料学报, 2015, 32(4):15-23. CHEN Aijiu, WANG Jing, MA Ying. Test of frost resistance for steel fiber rubber recycled concrete[J]. Acta Materiae Compositae Sinica,2015,32(4):15-23(in Chinese).
[4]	BEAUCHEMIN S, FOURNIER B, DUCHESNE J. Evaluation of the concrete prisms test method for assessing the potential alkali-aggregate reactivity of recycled concrete aggregates[J]. Cement and Concrete Research,2018,104:25-36. doi: 10.1016/j.cemconres.2017.10.008
[5]	吴相豪, 岳鹏君. 再生混凝土中氯离子渗透性能试验研究[J]. 建筑材料学报, 2011, 14(3):381-384. doi: 10.3969/j.issn.1007-9629.2011.03.018 WU Xianghao, YUE Pengjun. Experimental study on chloride ion penetration into recycled aggregate concrete[J]. Journal of Buliding Materials,2011,14(3):381-384(in Chinese). doi: 10.3969/j.issn.1007-9629.2011.03.018
[6]	李趁趁, 胡婧, 元成方, 等. 纤维/高强混凝土抗冻性能试验[J]. 复合材料学报, 2019, 36(8):1977-1983. LI Chenchen, HU Jing, YUAN Chengfang, et al. Experimental study on the freezing resistance of fiber reinforced high strength concrete[J]. Acta Materiae Compositae Sinica,2019,36(8):1977-1983(in Chinese).
[7]	BERNDT M. Properties of sustainable concrete containing fly ash, slag and recycled concrete aggregate[J]. Construction and Building Materials,2009,23(7):2606-2613. doi: 10.1016/j.conbuildmat.2009.02.011
[8]	GUO H, SHI C, GUAN X, et al. Durability of recycled aggregate concrete: A review[J]. Cement and Concrete Compo-sites,2018,89:251-259. doi: 10.1016/j.cemconcomp.2018.03.008
[9]	李秋义, 李云霞, 朱崇绩, 等. 再生混凝土骨料强化技术研究[J]. 混凝土, 2006, 195(1):74-77. doi: 10.3969/j.issn.1002-3550.2006.01.022 LI Qiuyi, LI Yunxia, ZHU Chongji, et al. Strengthening technique of recycled concrete aggregate[J]. Concrete,2006,195(1):74-77(in Chinese). doi: 10.3969/j.issn.1002-3550.2006.01.022
[10]	SAHOO K K, ARAKHA M, SARKAR P, et al. Enhancement of properties of recycled coarse aggregate concrete using bacteria[J]. International Journal of Smart and Nano Materials,2016,7(1):22-38. doi: 10.1080/19475411.2016.1152322
[11]	XUAN D, ZHAN B, POON C. Assessment of mechanical properties of concrete incorporating carbonated recycled concrete aggregates[J]. Cement and Concrete Composites,2016,65:67-74. doi: 10.1016/j.cemconcomp.2015.10.018
[12]	TAM V, TAM C, LE K. Removal of cement mortar remains from recycled aggregate using presoaking approaches[J]. Resources, Conservation and Recycling,2007,50(1):82-101. doi: 10.1016/j.resconrec.2006.05.012
[13]	肖建庄, 李标, 杨钱荣, 等. 复合改性再生混凝土抗氯离子渗透性能[J]. 混凝土与水泥制品, 2019, 282(10):1-5. XIAO Jianzhuang, LI Biao, YANG Qianrong, et al. Study on chloride penetration resistance of compound modified recycled concrete[J]. China Concrete and Cement Products,2019,282(10):1-5(in Chinese).
[14]	许佼. 再生混凝土骨料改性研究及其应用[D]. 淮南: 安徽理工大学, 2017. XU Jiao. Study on modification of recycled concrete aggregateandits application[D]. Huainan: Anhui University of Science and Technology, 2017(in Chinese).
[15]	SANTOS W F, QUATTTONE M, JOHN V M, et al. Roughness, wettability and water absorption of water repellent treated recycled aggregates[J]. Construction and Building Materials,2017,146:502-513. doi: 10.1016/j.conbuildmat.2017.04.012
[16]	ZHU Y G, KOU S C, POON C S, et al. Influence of silane-based water repellent on the durability properties of recycled aggregate concrete[J]. Cement and Concrete Composites,2013,35(1):32-38. doi: 10.1016/j.cemconcomp.2012.08.008
[17]	KOU S C, POON C S. Properties of concrete prepared with PVA-impregnated recycled concrete aggregates[J]. Cement and Concrete Composites,2010,32(8):649-654. doi: 10.1016/j.cemconcomp.2010.05.003
[18]	石建光, 许岳周. 骨料级配对再生混凝土强度和工作性能影响的试验研究和计算分析[J]. 混凝土, 2008, 219(1):82-86. doi: 10.3969/j.issn.1002-3550.2008.01.025 SHI Jianguang, XU Yuezhou. Experiment research and analysis of aggregate gradation on the strength and workability of recycled concrete[J]. Concrete,2008,219(1):82-86(in Chinese). doi: 10.3969/j.issn.1002-3550.2008.01.025
[19]	中国国家标准化管理委员会. 建筑用卵石、碎石: GB/T 14685—2011[S]. 北京: 中国标准出版社, 2011. Standardization Administration of the People's Republic of China. Pebbie and crushed stone for building: GB/T 14685—2011[S]. Beijing: Standards Press of China, 2011(in Chinese).
[20]	XIAO J, LI J, ZHANG C. Mechanical properties of recycled aggregate concrete under uniaxial loading[J]. Cement and Concrete Research,2005,35(6):1187-1194. doi: 10.1016/j.cemconres.2004.09.020
[21]	郭远新, 李秋义, 单体庆, 等. 再生粗骨料混凝土配合比简易设计方法[J]. 沈阳建筑大学学报(自然科学版), 2017, 33(6):1029-1038. GUO Yuanxin, LI Qiuyi, SHAN Tiqing, et al. Simplified design method for mix proportion of recycled coarse aggregate concrete[J]. Journal of Shenyang Jianzhu University (Natural Science),2017,33(6):1029-1038(in Chinese).
[22]	TAM V W Y, TAM C M. Assessment of durability of recycled aggregate concrete produced by two-stage mixing approach[J]. Journal of Materials Science,2007,42(10):3592-3602. doi: 10.1007/s10853-006-0379-y
[23]	LEITE M B, MONTEIRO P J M. Microstructural analysis of recycled concrete using X-ray microtomography[J]. Cement and Concrete Research,2016,81:38-48. doi: 10.1016/j.cemconres.2015.11.010
[24]	ASTM. Standard test method for measurement of tate of absorption of water by hudraulic cement concretes: C1585—13[S]. West Conshohocken: ASTM International, 2013.
[25]	中华人民共和国交通运输部. 水运工程混凝土试验规程: JTJ 270-1998[S]. 北京: 人民交通出版社, 1998. Ministry of Transport of the People's Republic of China. Testing code of concrete for port and water engineering: JTJ 270—1998[S]. Beijing: China Communication Press, 1998(in Chinese).
[26]	韩帅. 再生粗骨料品质和取代率对再生混凝土耐久性能的影响[D]. 青岛: 青岛理工大学, 2015. HAN Shuai. Influence of quality and substitution rate of recycled coarse aggregate on durability of recycled concrete[D]. Qingdao: Qingdao University of Technology, 2015(in Chinese).
[27]	肖建庄, 李佳彬, 孙振平, 等. 再生混凝土的抗压强度研究[J]. 同济大学学报(自然科学版), 2004, 32(12):1558-1561. doi: 10.3321/j.issn:0253-374X.2004.12.002 XIAO Jianzhuang, LI Jiabin, SUN Zhenping, et al. Study on compressive strength of recycled aggregate concrete[J]. Journal of Tongji University(Natural Science),2004,32(12):1558-1561(in Chinese). doi: 10.3321/j.issn:0253-374X.2004.12.002
[28]	鲍玖文. 持载及裂缝对混凝土中水分和氯离子传输性能的影响[D]. 大连: 大连理工大学, 2018. BAO Jiuwen. Influence of sustained loading and cracks on the transport properties of water and chloride within concrete[D]. Dalian: Dalian University of Technology, 2018(in Chinese).
[29]	张鹏, 赵铁军, 戴建国, 等. 硅烷改性混凝土防水和抗氯离子性能试验研究[J]. 土木工程学报, 2011, 44(3):72-78. ZHANG Peng, ZHAO Tiejun, DAI Jianguo, et al. Experimental study of the water repellency and chloride resistance of modified concrete with silane[J]. China Civil Engineering Journal,2011,44(3):72-78(in Chinese).
[30]	王晓飞. 再生粗骨料品质和取代率对再生混凝土力学性能的影响[D]. 青岛: 青岛理工大学, 2015. WANG Xiaofei. Influence of quality and substitution rate of recycled coarse aggregate on mechanical properties of recycled concrete[D]. Qingdao: Qingdao University of Technology, 2015(in Chinese).
[31]	王立成, 鲍玖文, 李淑红. 损伤混凝土毛细吸水性能试验研究和水分分布预测分析[J]. 大连理工大学学报, 2015, 55(6):587-604. WANG Licheng, BAO Jiuwen, LI Shuhong. Experimental study of capillary water absorption in damage concrete and prediction of water content distribution[J]. Journal of Dalian University of Technology,2015,55(6):587-604(in Chinese).