海水浸泡养护对磷酸钾镁水泥浆体微观结构和性能的影响
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摘要
为研究海水浸泡养护对磷酸钾镁水泥(MKPC)浆体微观结构和性能的影响,测试了不同养护条件下MKPC浆体试件的抗压强度和干燥收缩率,分析了其物相组成和微观结构.结果表明:在海水浸泡环境下,如果MKPC浆体试件已凝结且具有一定的初始结构强度,其主要水化产物MgKPO_4·6H_2O(MKP)在呈弱碱性的海水环境下溶解度低、水解现象减轻;海水的渗入使MKPC浆体试件的水化反应得以持续进行,水化反应生成较多的MKP,在弱碱性海水环境下,MKP更易结晶,生成的MKP晶体结晶程度高、缺陷少,后续生成的MKP晶体不断填充MKPC硬化体的孔隙,使硬化体结构趋于致密;自然养护3d后浸入海水养护的MKPC试件有较高的抗压强度和较低的干燥收缩率,其28,60d抗压强度较全程自然养护的MKPC试件分别提高13%和5%,而其60d干燥收缩率仅为全程自然养护MKPC试件的12%,为28d后浸入海水养护MKPC试件的23%.
In order to study effect of early seawater curing on microstructure and properties of magnesium potassium phosphate cement(MKPC)paste,the compressive strength and drying shrinkage of MKPC paste specimens under different curing conditions,and the phase composition and microstructure were analyzed.The results show that there is an obviouse effect of early seawater curing on the properiets of MKPC paste.If MKPC paste is hardening and has a certain initial structural strength,the main hydrate MgKPO_4·6 H_2O(MKP)the gradual infiltration of seawater makes the hydration reaction of MKPC paste sustained in sea,and more MgKPO_4·6 H_2O crystals with high crystallization degree and less defect are formed and filled in pores in hardened MKPC paste,and that the structure of harden MKPC paste tends to be dense.For this reason,MKPC paste specimens,were immersed in sea water after 3 dnatural curing,have higher compressive strength and lower deformation,its 28 dand 60 dcompressive strength are respectively 13%and 5% higher than that of MKPC paste in natural curing condition,and its 60 dshrinkage deformation is12%that of MKPC paste in natural curing condition and 23%than that of MKPC paste in seawater condition after 28 dnatural curing.
In order to study effect of early seawater curing on microstructure and properties of magnesium potassium phosphate cement(MKPC)paste,the compressive strength and drying shrinkage of MKPC paste specimens under different curing conditions,and the phase composition and microstructure were analyzed.The results show that there is an obviouse effect of early seawater curing on the properiets of MKPC paste.If MKPC paste is hardening and has a certain initial structural strength,the main hydrate MgKPO_4·6 H_2O(MKP)the gradual infiltration of seawater makes the hydration reaction of MKPC paste sustained in sea,and more MgKPO_4·6 H_2O crystals with high crystallization degree and less defect are formed and filled in pores in hardened MKPC paste,and that the structure of harden MKPC paste tends to be dense.For this reason,MKPC paste specimens,were immersed in sea water after 3 dnatural curing,have higher compressive strength and lower deformation,its 28 dand 60 dcompressive strength are respectively 13%and 5% higher than that of MKPC paste in natural curing condition,and its 60 dshrinkage deformation is12%that of MKPC paste in natural curing condition and 23%than that of MKPC paste in seawater condition after 28 dnatural curing.
引文
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[13]LI J S,ZHANG W B,CAO Y,Laboratory evaluation of magnesium phosphate cement paste and mortar for rapid repair of cement concrete pavement[J].Constructure Building Materials,2014,58:122-128.
[14]林玮,孙伟,李宗津.磷酸镁水泥砂浆的干燥收缩性能[J].工业建筑,2011,41(4):75-78.LI Wei,SUN Wei,LI Zongjin.Drying and shrinkage of magnesium phosphate cement mortar[J].Industrial Building,2011,41(4):75-78.(in Chinese)
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[16]ZHANG S,SHI H S,HUANG S W,et al.Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition[J].Journal of Thermal Analysis and Calorimetry,2013,111(1):35-40.
[17]WU Q,BISHOP P L.Enhancing struvite crystallization from anaerobic supernatant[J].Environment Engineering Science,2004,3(1):21-29.
[18]QIAO Fei.Reaction mechanisms of magnesium potassium phosphate cement and its application[D].Hong Kong:The Hong Kong University of Science and Technology,2010.
[2]ANDRADE A,SCHUILING R D.The chemistry of struvite crystallization[J].Mineral Journal,2001,23:5-6.
[3]DING Z,LI Z.High-early-strength phosphate cement with fly ash[J].ACI Material Journal,2005,102(6):375-381.
[4]DING Z,LI Z,XING F.Chemical durability investigation of magnesium phosphosilicate cement[J].Key Engineering Materials,2006,302/303:275-281.
[5]甄树聪,杨建明,张青行,等.磷酸镁水泥抗氯离子侵蚀性能研究[J].建筑材料学报,2010,13(5):700-704.ZHEN Shucong,YANG Jianming,ZHANG Qingxing,et al.research on resistance of magnesia-phosphate cement to chloride Ion erosion[J].Journal of Building Materials,2010,13(5):700-704.(in Chinese)
[6]蒋江波,薛明,汪宏涛,等.海工磷酸镁水泥基材料的制备及性能研究[J].功能材料,2012,43(7):828-834.JIANG Jiangbo,XUE Ming,WANG Hongtao,et al.Research on preparation and properties of marine magnesium phosphate cement based materials[J].Journal of Functional Materials,2012,43(7):828-834.(in Chinese)
[7]LI Y,SHI T,LI J.Effects of fly ash and quartz sand on waterresistance and salt-resistance of magnesium phosphate cement[J].Construction and Building Materials,2016,105:384-390.
[8]QIAN C,YANG J.Effect of disodium hydrogen phosphate on hydration and hardening of magnesium potassium phosphate cement[J].Journal of Materials in Civil Engineering,2011,23(10):1405-1411.
[9]杨建明,史才军,常远,等.掺复合缓凝剂的磷酸钾镁水泥浆体的水化硬化特性[J],建筑材料学报,2013,16(1):46-52.YANG Jianming,SHI Caijun,CHANG Yuan,et al.Hydration and hardening characteristics ofpotassium magnesium phosphate cement paste containing composite retarders[J].Journal of Building Materials,2013,16(1):46-52.(in Chinese)
[10]杨建明,史才军.一种磷酸钾镁水泥凝结时间和早期水化速度的控制方法:中国,102234200A[P].2011-11-09.YANG Jianming,SHI Caijun.A control method for setting time and the early hydration speed of potassium magnesium phosphate cement:China,102234200A[P].2011-11-9.(in Chinese)
[11]ABDELRAZIG B E I,SHARP J H,EL-JAZAIRI B.The chemical composition of mortars made from magnesia-phosphate cement[J].Cement and Concrete Research,1988,18(3):415-425.
[12]李东旭,李鹏晓,冯春花.磷酸镁水泥耐水性的研究[J].建筑材料学报,2009,12(5):505-510.LI Dongxu,LI Pengxiao,FENG Chunhua.Research on water resistance of magnesium phosphate cement[J].Journal of Building Materials,2009,12(5):505-510.(in Chinese)
[13]LI J S,ZHANG W B,CAO Y,Laboratory evaluation of magnesium phosphate cement paste and mortar for rapid repair of cement concrete pavement[J].Constructure Building Materials,2014,58:122-128.
[14]林玮,孙伟,李宗津.磷酸镁水泥砂浆的干燥收缩性能[J].工业建筑,2011,41(4):75-78.LI Wei,SUN Wei,LI Zongjin.Drying and shrinkage of magnesium phosphate cement mortar[J].Industrial Building,2011,41(4):75-78.(in Chinese)
[15]常远,史才军,杨楠,等.氧化镁细度对磷酸钾镁水泥性能的影响[J].硅酸盐学报,2013,41(4):492-499.CHANG Yuan,SHI Caijun,YANG Nan,et al.Effect of fineness of magnesium oxide on properties of magnesium potassium phosphate cement[J].Journal of Chinese Ceramic Society,2013,41(4):492-499.(in Chinese)
[16]ZHANG S,SHI H S,HUANG S W,et al.Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition[J].Journal of Thermal Analysis and Calorimetry,2013,111(1):35-40.
[17]WU Q,BISHOP P L.Enhancing struvite crystallization from anaerobic supernatant[J].Environment Engineering Science,2004,3(1):21-29.
[18]QIAO Fei.Reaction mechanisms of magnesium potassium phosphate cement and its application[D].Hong Kong:The Hong Kong University of Science and Technology,2010.