一种新型加固软弱砂土的方法及试验研究
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摘要
将腻子粉作为钙源,磷酸氢二铵(DAP)溶液作为原料,研究了在软弱砂土中原位制备羟基磷灰石(HAP)加固软弱砂土的新方法,并采用XRD与SEM分析了HAP的加固机理.试验结果表明,腻子粉和DAP反应产生的羟基磷灰石(HAP)可显著增强砂土颗粒间的黏结,填充砂土空隙,有效地提高砂土试块的抗压强度,最大增幅为245%.DAP浓度越大,则产生的HAP数量越多,结晶性能越佳,砂土试块抗压强度的增幅也越大.并且,当DAP掺量增加到40%时,摩擦角和黏聚力分别提升了74.3%和753.0%.
A new reinforcement method for soft sand soil by in-situ produced hydroxyapatite(HAP)was proposed,with putty powder being the source of calcium and(NH_4)_2HPO_4(DAP)being the reactant.The reinforcement mechanism was also studied with XRD and SEM.Results showed that the produced HAP can effectively enhance the bonding effect between sand soil particles,and fill the pores,and thus greatly promote the compressive strength of the sand soil samples with a maximum improvement of 245%.The higher the concentration of the DAP solution,the more the production of HAP with better crystallinity,which eventually contributed to a much larger increase of the compressive strength.Moreover,when the DAP content increased to 40%,the friction angle and cohesion respectively increased by 74.3% and 753.0%.
A new reinforcement method for soft sand soil by in-situ produced hydroxyapatite(HAP)was proposed,with putty powder being the source of calcium and(NH_4)_2HPO_4(DAP)being the reactant.The reinforcement mechanism was also studied with XRD and SEM.Results showed that the produced HAP can effectively enhance the bonding effect between sand soil particles,and fill the pores,and thus greatly promote the compressive strength of the sand soil samples with a maximum improvement of 245%.The higher the concentration of the DAP solution,the more the production of HAP with better crystallinity,which eventually contributed to a much larger increase of the compressive strength.Moreover,when the DAP content increased to 40%,the friction angle and cohesion respectively increased by 74.3% and 753.0%.
引文
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[3]张文龙,刘燕燕,李永绣,等.碳酸钙磷酸化工艺制备多孔球形羟基磷灰石[J].过程工程学报,2006,6(1):37-41.ZHANG Wen-long,LIU Yan-yan,LI Yong-xiu,et al.Preparation of porous spherical hydroxyapatite particles by phosphoration of calcium carbonate[J].The Chinese Journal of Process Engineering,2006,6(1):37-41.(in Chinese)
[4]李蔚,高濂.纳米羟基磷灰石粉体的制备和低温烧结[J].过程工程学报,2002,2(4):305-308.LI Wei,GAO Lian.Synthesis and low-temperature sintering of nano-sized HAP powders[J].The Chinese Journal of Process Engineering,2002,2(4):305-308.(in Chinese)
[5]朱晓丽,王迎军,叶建东.纳米羟基磷灰石的溶胶-凝胶制备及其特性研究[J].硅酸盐通报,2003,22(2):77-80.ZHU Xiao-li,WANG Ying-jun,YE Jian-dong.Study on preparation and characterization of nano-sized hydroxyapatite synthesized by Sol-Gel method[J].Bulletin of the Chinese Ceramic Society,2003,22(2):77-80.(in Chinese)
[6]王英,靳正国,华缜,等.超声处理对羟基磷灰石纳米针状晶形成的影响[J].硅酸盐通报,2003,22(6):24-26,38.WANG Ying,JIN Zheng-guo,HUA Zhen,et al.Effects of ultrasonic treatment on formation of hydroxyapatite nanometer needle-like crystal in aqueous solution[J].Bulletin of the Chinese Ceramic Society,2003,22(6):24-26,38.(in Chinese)
[7]徐光亮,聂轶霞,赖振宇.水热合成羟基磷灰石纳米粉体的研究[J].无机材料学报,2002,17(3):600-604.XU Guang-liang,NIE Yi-xia,LAI Zhen-yu.Experimental study on the synthesis of nano-hydroxyapatite under hydrothermal condition[J].Journal of Inorganic Materials,2002,17(3):600-604.(in Chinese)
[8]陈晓明,梁飞,王友法,等.羟基磷灰石结晶形貌的控制[J].中国陶瓷,2001,37(5):7-8,28.CHEN Xiao-ming,LIANG Fei,WANG You-fa,et al.Control of crystallization shape of hydroxyapatite[J].China Ceramics,2001,37(5):7-8,28.(in Chinese)
[9]CHARITIDIS C A,SKARMOUTSOU A,TSETSEKOU A,et al.Nanomechanical properties of hydroxyapatite(HAP)with DAB dendrimers(poly-propylene imine)coatings onto titanium surfaces[J].Materials Science and Engineering B,2013,178:391-399.
[10]王永和,胡萍,卿启湘.影响土样击实试验结果的试验分析[J].铁道科学与工程学报,2006,3(6):31-34.WANG Yong-he,HU Ping,QING Qi-xiang.Analysis on the influence factors in the compaction test[J].Journal of Railway Science and Engineering,2006,3(6):31-34.(in Chinese)
[11]张志权,王志勇.最大干密度和最优含水率的准确性探讨[J].长安大学学报(建筑与环境科学版),2004,21(2):7-10.ZHANG Zhi-quan,WANG Zhi-yong.Discussion on precision of biggest dry density and optimum water content[J].Journal of Chang′an University(Arch&Envir Science Editon),2004,21(2):7-10.(in Chinese)
[12]ALDAOOD A,BOUASKER M,AL-MUKHTAR M.Impact of wetting-drying cycles on the microstructure and mechanical properties of lime-stabilized gypseous soils[J].Engineering Geology,2014,174:11-21.