废弃混凝土砂浆组分接触硬化性能研究
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摘要
为考察废弃混凝土砂浆组分的接触硬化性能,将与粗集料分离后的砂浆组分磨细,一组磨细粉体直接压制成型,另一组粉体通过加入磨细生石灰和石英砂调整Ca/Si摩尔比为1,在120℃,水固比为5∶1的条件下进行动态水热处理后压制成型.测定成型试块的表观密度、抗压强度、抗折强度、软化系数,以表征粉体的接触硬化性能.结果表明:磨细砂浆组分具有接触硬化性能,一定条件的水热反应可优化这种性能.XRD分析显示,水热反应产物主要为结晶不良的水化硅酸钙;成型试块的抗折强度、抗压强度最高分别为5.7 MPa和16.8 MPa,并具有一定的耐水性,软化系数达到0.7.粗集料种类及水热反应恒温时间对其接触硬化性能有一定影响.
In order to investigate the contact-hardening mechanism of the mortar component of demolished concrete,the mortars were separated and ground.One group of the power was directly molded at a certain compression,and the other group was molded after hydro-thermal synthesis at the temperature of 120 ℃ with a water solid ration of 5 by adding ground lime and quartz sand to adjust Ca/Si morel ratio.The apparent density,compressive strength,flexural strength and softening coefficient of the molded specimens were measured immediately.The results have shown that the ground mortar has a contact-hardening property to some extent and after hydro-thermal reaction,this property is obviously improved.The reacting production is amorphous silicate calcium hydration by XRD analysis.The maximum flexible strength and compressive strength are up to 5.7 MPa and 16.8 MPa respectively,and the specimen has a certain water resistance property,of which the softening coefficient can be 0.7.The property of contact-hardening is affected by the styles of the coarse aggregates of the demolished concretes and the constant time of temperature.
In order to investigate the contact-hardening mechanism of the mortar component of demolished concrete,the mortars were separated and ground.One group of the power was directly molded at a certain compression,and the other group was molded after hydro-thermal synthesis at the temperature of 120 ℃ with a water solid ration of 5 by adding ground lime and quartz sand to adjust Ca/Si morel ratio.The apparent density,compressive strength,flexural strength and softening coefficient of the molded specimens were measured immediately.The results have shown that the ground mortar has a contact-hardening property to some extent and after hydro-thermal reaction,this property is obviously improved.The reacting production is amorphous silicate calcium hydration by XRD analysis.The maximum flexible strength and compressive strength are up to 5.7 MPa and 16.8 MPa respectively,and the specimen has a certain water resistance property,of which the softening coefficient can be 0.7.The property of contact-hardening is affected by the styles of the coarse aggregates of the demolished concretes and the constant time of temperature.
引文
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[13]TAYLOR H F W.Cement chemistry[M].London:Academ-ic Press,1990:142-145.
[14]彭小芹.合成水化硅酸盐纳米粉体胶凝材料研究[D].重庆:重庆大学材料科学与工程学院,2004:36-38.PENG Xiao-qin.Study on synthesized hydrated silicate as nanopowder binding materials[D].Chongqing:College of MaterialScience and Engineering,Chongqing University,2004:36-38.(In Chinese)
[15]CONSTANTINIDES G,ULM F J.The nanogranular natureof C-S-H[J].Journal of the Mechanic and Physics of Sol-ids,2007,55:64-90.
[2]蒲心诚,秦力川,严吴南,等.非稳定结构矿物质的接触硬化性能[J].硅酸盐学报,1999,27(2):133-138.PU Xin-cheng,QIN Li-chuan,YAN Wu-nan,et al.The con-tact hardening performance of dispersive minerals with unsta-ble structure[J].Journal of the Chinese Ceramic Society,1999,27(2):133-138.(In Chinese)
[3]肖建庄.再生混凝土[M].北京:中国建筑工业出版社,2008:50-100.XIAO Jian-zhuang.Recycled concrete[M].Beijing:ChinaBuilding Industry Press,2008:50-100.(In Chinese)
[4]候景鹏,史巍,宋玉普.再生混凝土技术研究开发与应用推广[J].建筑技术,2002,33(1):15-17.HOU Jing-peng,SHI Wei,SONG Yu-pu.Development andapplication promoting of recycled concrete[J].ArchitectureTechnology,2002,33(1):15-17.(In Chinese)
[5]范小平.再生骨料混凝土的开发与研究[J].福建建材,2006(4):4-5.FAN Xiao-ping.Development and research of recycled aggre-gate concrete[J].Fujian Building Materials,2006(4):4-5.(In Chinese)
[6]HANSEN T C.Recycling of demolished concrete and masonry[M].London:E&FN Spon,1992.
[7]胡曙光,何永佳.再生胶凝材料对水泥水化体系的影响[J].武汉理工大学学报,2006,28(10):4-8.HU Shu-guang,HE Yong-jia.The effect of regenerated bind-ing materials on the hydration system of portland cement[J].Journal of Wuhan University of Technology,2006,28(10):4-8.(In Chinese)
[8]唐春平.再生混凝土中绿色胶凝材料的研究[J].山西建筑,2007,33(1):169-170.TANG Chun-ping.A study on green cementing material of re-cycled concrete[J].Shanxi Architecture,2007,33(1):169-170.(In Chinese)
[9]权宗刚.地震后建筑垃圾资源化技术及其在重建中的应用研究[C]//中国硅酸盐学会房屋建筑材料分会:房建材料与绿色建筑.北京:中国建材工业出版社,2009:50-54.QUAN Zong-gang.Application research on construction wasterecycling technology and its rebuilt after earthquake[C]//TheBuilding Material Union of Silicate Association of China:Building Materials and Green Buildings.Beijing:China Build-ing Materials and Industry Press,2009:50-54.(In Chinese)
[10]布特ЮМ,拉什科维奇ПН.高温下胶凝物质的硬化[M].重庆建筑工程学院,译.北京:中国工业出版社,1965:221-254.BOOTЮМ,LШКЕВЦПН.Cementitious materials harden-ing under high temperature[M].Translated by Institute ofArchitecture and Engineering of Chongqing.Beijing:China In-dustry Press,1965:221-254.(In Chinese)
[11]杨南如,岳文海.无机非金属材料图谱手册[M].武汉:武汉工业大学出版社,2000:85.YANG Nan-ru,YUE Wen-hai.Handbook of spectroscopy ofi-norganic nonmetallic materials[M].Wuhan:Wuhan Universi-ty of Technology Press,2000:85.(In Chinese)
[12]彭小芹,何丽娟,刘艳萌.水热法制备水化硅酸钙纳米粉体[J].重庆大学学报:自然科学版,2005,28(5):59-62.PENG Xiao-qin,HE li-juan,LIU Yan-meng.Hydrated calci-um silicate with nm-order size manufactured by using dynamicautoclaved technology[J].Journal of Chongqing University:Natural Science Edition,2005,28(5):59-62.(In Chinese)
[13]TAYLOR H F W.Cement chemistry[M].London:Academ-ic Press,1990:142-145.
[14]彭小芹.合成水化硅酸盐纳米粉体胶凝材料研究[D].重庆:重庆大学材料科学与工程学院,2004:36-38.PENG Xiao-qin.Study on synthesized hydrated silicate as nanopowder binding materials[D].Chongqing:College of MaterialScience and Engineering,Chongqing University,2004:36-38.(In Chinese)
[15]CONSTANTINIDES G,ULM F J.The nanogranular natureof C-S-H[J].Journal of the Mechanic and Physics of Sol-ids,2007,55:64-90.
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