普通混凝土和高性能混凝土泛碱试验研究
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摘要
对晋北地区混凝土表面泛碱产物进行采样并分析其化学成分,得到泛碱产物90%以上是Na_2SO_4.分别制备普通混凝土试件和高性能混凝土试件各一批,半浸泡于Na_2SO_4溶液中并辅以干湿循环,分析两种试件的区别反应,得到如下结论:高性能混凝土和普通混凝土试块的的泛碱产物虽然都是硫酸钠晶体,但结晶形貌不同;高性能混凝土能延缓泛碱的发生,且其泛碱产物明显少于普通混凝土;高性能混凝土对于防止硫酸盐化学侵蚀方面有明显优势.
White efflorescence,collected from north region of Shanxi,was analyzed to obtain its chemical composition.After the experiment,it was found that Na_2SO_4 accounts for 90% of all efflorescence.Ordinary concrete specimens(OCS)and high performance concrete specimens(HPCS)were manufactured and partially exposed to Na_2SO_4 solution,then their different reflections were studied under dry-wet circulation.Experimental results show that:Both specimens' efflorescence are Na_2SO_4 crystal,but crystal morphology are different;HPCS appear to have a delaying effect on efflorescence,and have less efflorescence than ordinary concrete;HPCS have obvious advantage in chemical sulfate attack resistance.
White efflorescence,collected from north region of Shanxi,was analyzed to obtain its chemical composition.After the experiment,it was found that Na_2SO_4 accounts for 90% of all efflorescence.Ordinary concrete specimens(OCS)and high performance concrete specimens(HPCS)were manufactured and partially exposed to Na_2SO_4 solution,then their different reflections were studied under dry-wet circulation.Experimental results show that:Both specimens' efflorescence are Na_2SO_4 crystal,but crystal morphology are different;HPCS appear to have a delaying effect on efflorescence,and have less efflorescence than ordinary concrete;HPCS have obvious advantage in chemical sulfate attack resistance.
引文
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[15]马昆林,龙广成,谢友均.硫酸盐半浸泡侵蚀下水泥基材料中腐蚀产物的试验研究[J].混凝土,2013(9):33-35.Ma Kunlin,Long Guangcheng,Xie Youjun.Corrosion products of cementious materials under sulfate partial soaking attack[J].Concrete,2013(9):33-35.(in Chinese)
[2]Dow C,Glasser F P.Calcium carbonate efflorescence on portlant cement and building materials[J].Cement and Concrete Research,2003,33(7):147-154.
[3]Brocken H,Nijland T G.White efflorescence on brick masonry and concrete masonry blocks,with special emphasis on sulfate efflorescence on concrete blocks[J].Construction and Building Materials,2004,18(5):315-323.
[4]王超,陈之光,董玉罡,等.一种混凝土墙面防潮防泛碱漆及制备方法[P].中国:CN104312346A,2015-01-28.
[5]张伟,史琛,项志敏,等.改性有机硅涂料对混凝土耐久性的影响[J].混凝土,2010(8):73-75.Zhang Wei,Shi Chen,Xiang Zhimin,et al.Influences of modified silicone coating on the durability of concrete[J].Concrete,2010(8):73-75.(in Chinese)
[6]马昆林,谢友均,龙广成,等.水泥基材料在硫酸盐结晶腐蚀侵蚀下的劣化行为[J].中南大学学报(自然科学版),2010,41(1):303-309.Ma Kunlin,Xie Youjun,Long Guangcheng,et al.Deterioration behaviors of sulfate crystallization attack on cement-based material[J].Journal of Central South University(Science and Technology),2010,41(1):303-309.(in Chinese)
[7]马昆林.混凝土盐结晶侵蚀机理与评价方法[D].长沙:中南大学,2009.
[8]石明霞,谢友均,刘宝举.水泥-粉煤灰复合胶凝材料抗硫酸盐结晶侵蚀性[J].建筑材料学报,2003,6(4):350-355.Shi Mingxia,Xie Youjun,Liu Baoju.Resistance to sulfate salt crystallization of cement pastes containing ultra-fine fly ash[J].Journal of building Materials,2003,6(4):350-355.(in Chinese)
[9]Bassuoni M T,Rahman M M.Response of concrete to accelerated physical salt attack exposure[J].Cement and Concrete Research,2015,79(1):395-408.
[10]Zhang Z H,Provis J L,Reid A,et al.Fly ash-based geopolymers:the relationship between composition,pore structure and efflorescence[J].Cement and Concrete Research,2014,64(10):30-41.
[11]石齐,吴芳,华腾飞,等.矿物细掺料对装饰砂浆性能的影响研究[J].硅酸盐通报,2013,32(12):2490-2494.Shi Qi,Wu Fang,Hua Tengfei,et al.Influenced research of fine mineral mixture on the properties of decoration mortar[J].Bulletin of the Chinese Ceramic Society,2013,32(12):2490-2494.(in Chinese)
[12]焦向科,张一敏.抑制矿物聚合材料泛霜行为的试验研究[J].硅酸盐通报,2015,34(3):621-625.Jiao Xiangke,Zhang Yimin.Experimental Study on Inhibiting the Efflorescence Behavior of Geopolymer[J].Bulletin of the Chinese Ceramic Society,2015,34(3):621-625.(in Chinese)
[13]Kani E N,Allahverdi A,Provis J L.Efflorescence control in geopolymer binders based on natural pozzolan[J].Cement&Concrete Composites,2012,34(1):25-33.
[14]梁咏宁,袁迎曙.硫酸钠和硫酸镁溶液中混凝土腐蚀破坏的机理[J].硅酸盐学报,2007,35(4):504-508.Liang Yongning,Yuan Yingshu.Mechanism of concrete destruction under sodium sulfate and magnesium sulfate solution[J].Journal of the Chinese Ceramic Society,2007,35(4):504-508.(in Chinese)
[15]马昆林,龙广成,谢友均.硫酸盐半浸泡侵蚀下水泥基材料中腐蚀产物的试验研究[J].混凝土,2013(9):33-35.Ma Kunlin,Long Guangcheng,Xie Youjun.Corrosion products of cementious materials under sulfate partial soaking attack[J].Concrete,2013(9):33-35.(in Chinese)