基于NMR的风积沙混凝土冻融孔隙演变研究
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摘要
利用风积沙等质量替代河砂来配制风积沙混凝土,并对其进行抗冻性试验,同时借助核磁共振(NMR)技术分析其冻融孔隙演变特征.研究表明:评价风积沙混凝土抗冻性时,相对动弹性模量指标比质量损失率指标更为精准;经冻融循环后,风积沙混凝土的孔隙度和渗透率均增大,其中风积沙替代率为40%的风积沙混凝土束缚水饱和度增大、自由水饱和度减小,其抗冻耐久性最佳;风积沙混凝土的孔隙分布会影响其抗冻性的优劣,冻融循环后若孔径小于10nm的孔隙增多且大于100nm的孔隙减少,则可延缓混凝土冻融损伤,若孔径小于10nm的孔隙减少且大于100nm的孔隙增多,则会加剧混凝土冻融损伤.
Aeolian sand rather than river sand was used to prepare concrete. The freeze-thaw resistance test of aeolian sand concrete was carried out. The freeze-thaw evolution of pore characteristic of aeolian sand concrete was analyzed by means of nuclear magnetic resonance(NMR) technique. The results show that for evaluation of frost resistance of aeolian sand concrete, relative dynamic elasticity modulus is more accurate than mass loss rate; the porosity and permeability of the concrete increase after the freeze-thaw cycles in which the frost resistance of aeolian sand concrete with the replacement rate of 40% is the best. The bound water saturation after the freeze-thaw cycles of the concrete with the replacement rate of 40% increases and the free water saturation is reduced. The pore distribution of aeolian sand concrete affects the frost resistance. After the freeze-thaw cycles, the pores with radius less than 10 nm increase and pores with radius larger than 100 nm decrease with the result that the freeze-thaw damage delays. Conversely, pores with radius less than 10 nm decrease and pores with radius larger than 100 nm increase which may result in aggravating the freeze-thaw damage.
Aeolian sand rather than river sand was used to prepare concrete. The freeze-thaw resistance test of aeolian sand concrete was carried out. The freeze-thaw evolution of pore characteristic of aeolian sand concrete was analyzed by means of nuclear magnetic resonance(NMR) technique. The results show that for evaluation of frost resistance of aeolian sand concrete, relative dynamic elasticity modulus is more accurate than mass loss rate; the porosity and permeability of the concrete increase after the freeze-thaw cycles in which the frost resistance of aeolian sand concrete with the replacement rate of 40% is the best. The bound water saturation after the freeze-thaw cycles of the concrete with the replacement rate of 40% increases and the free water saturation is reduced. The pore distribution of aeolian sand concrete affects the frost resistance. After the freeze-thaw cycles, the pores with radius less than 10 nm increase and pores with radius larger than 100 nm decrease with the result that the freeze-thaw damage delays. Conversely, pores with radius less than 10 nm decrease and pores with radius larger than 100 nm increase which may result in aggravating the freeze-thaw damage.
引文
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[2] CHUAH S,DUAN W,PAN Z,et al.The properties of fly ash based geopolymer mortars made with dune sand[J].Materials and Design,2016,92:571-578.
[3] ZHANG G,SONG J,YANG J,et al.Performance of mortar and concrete made with a fine aggregate of desert sand[J].Building and Environment,2006,41(11):1478-1481.
[4] DONG W,SHEN X,XUE H,et al.Research on the freeze-thaw cycle test and damage model of aeolian sand lightweight aggregate concrete[J].Construction and Building Materials,2016,123:792-799.
[5] POWERS T C.Absorption of water by Portland cement paste during the hardening process[J].Industrial and Engineering Chemistry,1935,27(7):790-794.
[6] 王洪强,付晨东,井连江,等.核磁共振成像技术在岩石物理实验中的应用[J].测井技术,2005,29(2):95-97.WANG Hongqiang,FU Chendong,JING Lianjiang,et al.Application of NMR imaging technology in rock petrophysicsexperiment[J].Well Logging Technology,2005,29(2):95-97.(in Chinese)
[7] 李杰林,周科平,张亚民,等.基于核磁共振技术的岩石孔隙结构冻融损伤试验研究[J].岩石力学与工程学报,2012,31(6):1208-1214.LI Jielin,ZHOU Keping,ZHANG Yamin,et al.Experimental Study of rock porous structure damage characteristics under condition of freezing-thawing cycles based on nuclear magnetic resonance technique[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1208-1214.(in Chinese)
[8] 白松涛,程道解,万金彬,等.砂岩岩石核磁共振T2谱定量表征[J].石油学报,2016,37(3):382-391,414.BAI Songtao,CHENG Daojie,WAN Jinbin,et al.Quantitative characterization of sandstone NMR T2 spectrum[J].Acta Petrolei Sinica,2016,37(3):382-391,414.(in Chinese)
[9] 周华,李英亮,高峰,等.低场单边核磁对砖石材料加固效果的评价[J].建筑材料学报,2013,16(6):1097-1102.ZHOU Hua,LI Yingliang,GAO Feng,et al.Evaluation of consolidation of the brick materials by mobile single-side NMR[J].Journal of Building Materials,2013,16(6):1097-1102.(in Chinese)
[10] ZHOU C,REN F,WANG Z,et al.Why permeability to water is anomalously lower than that to many other fluids for cement-based material?[J].Cement and Concrete Research,2017,100:373-384.
[11] CANO-BARRITA P F D J,CASTELLANOS F,RAMIREZ-ARELLANES S,et al.Monitoring compressive strength of concrete by nuclear magnetic resonance,ultrasound,and rebound hammer[J].ACI Materials Journal,2015,112(1):147-154.
[12] 王海龙,张克,额日德木.改性橡胶对轻骨料混凝土改性作用分析[J].建筑材料学报,2017,20(5):780-786.WANG Hailong,ZHANG Ke,Eridemu.Modification effect analysis of modified rubber crumb on lightweight aggregate concrete[J].Journal of Building Materials,2017,20(5):780-786.(in Chinese)
[13] 许文彬,李庆斌,胡昱.混凝土凝结过程中水分变化规律研究[J].水力发电学报,2017,36(7):92-103.XU Wenbin,LI Qingbin,HU Yu.Water content variations in the process of concrete setting[J].Journal of Hydroelectric Engineering,2017,36(7):92-103.(in Chinese)
[14] 王萧萧,申向东,王海龙,等.天然浮石混凝土孔溶液结冰规律的研究[J].材料导报,2017,31(6):130-135.WANG Xiaoxiao,SHEN Xiangdong,WANG Hailong,et al.Research on icing law of pore solution in natural pumice concrete[J].Materials Review,2017,31(6):130-135.(in Chinese)
[15] 刘卫,邢立,孙佃庆,等.核磁共振录井[M].北京:石油工业出版社,2011:33-49.LIU Wei,XING Li,SUN Tianqing,et al.Nuclear magnetic resonance logging[M].Beijing:Petroleum Industry Press,2011:33-49.(in Chinese)
[16] WANG X,SHEN X,WANG H,et al.Nuclear magnetic resonance analysis of freeze-thaw damage in natural pumice concrete[J].Materiales de Construcción,2016,66(322):e087.
[17] JIN S,ZHANG J,HUANG B.Fractal analysis of effect of air void on freeze-thaw resistance of concrete[J].Construction and Building Materials,2013,47(5):126-130.
[18] WANG X,SHEN X,WANG H,et al.Nuclear magnetic resonance analysis of concrete-lined channel freeze-thaw damage[J].Journal of the Ceramic Society of Japan,2015,123(1):43-51.
[19] 吴中伟,廉慧珍.高性能混凝土[M].北京:中国铁道出版社,1999:41-43.WU Zhongwei,LIAN Huizhen.High performance concrete[M].Beijing:China Railway Press,1999:41-43.(in Chinese)
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