混凝土养护膜保湿性能及其养护效果研究
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摘要
研究了混凝土养护膜吸水性、保水性、释水性和透水汽性等保湿性能参数,对比了不同养护方式对混凝土收缩、水化产物及微观结构的影响。试验结果表明,混凝土养护膜可维持内部密闭空间的湿度在养护期间高于95%。与自然养护相比,采用养护膜养护可大幅降低混凝土早期收缩和长期收缩。X射线衍射数据表明养护膜养护对水泥水化产物组成无明显影响,表层水化程度与标准养护相近,略高于自然养护。扫描电子显微镜观察结果显示,养护膜养护可增加水泥净浆表层密实度。
The moisturizing performance parameters of concrete curing f ilm such as water absorption,water retention,water releasing and water vapor permeability were studied. The effects of different curing methods on concrete shrinkage,hydration products and microstructure were compared. The test results showthat the concrete curing f ilm can maintain the humidity of the internal airtight space higher than 95% during the curing period.Compared with natural curing,curing f ilm curing can signif icantly reduce early shrinkage and long-term shrinkage of concrete.X RD data showthat curing f ilm curing has no obvious effect on composition of cement hydration product,and the hydration degree of concrete surface is similar to that with standard curing,slightly higher than natural curing.SEMpictures showthat curing f ilm curing can increase the surface compactness of cement paste.
The moisturizing performance parameters of concrete curing f ilm such as water absorption,water retention,water releasing and water vapor permeability were studied. The effects of different curing methods on concrete shrinkage,hydration products and microstructure were compared. The test results showthat the concrete curing f ilm can maintain the humidity of the internal airtight space higher than 95% during the curing period.Compared with natural curing,curing f ilm curing can signif icantly reduce early shrinkage and long-term shrinkage of concrete.X RD data showthat curing f ilm curing has no obvious effect on composition of cement hydration product,and the hydration degree of concrete surface is similar to that with standard curing,slightly higher than natural curing.SEMpictures showthat curing f ilm curing can increase the surface compactness of cement paste.
引文
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[2]YANG J,FAN J,KONG B,et al. Theory and Application of New Automated Concrete Curing System[J].Journal of Building Engineering,2018,17:125-134.
[3]KIM J H,CHOI S W,LEE K M,et al. Influence of Internal Curing on the Pore Size Distribution of High Strength Concrete[J].Construction and Building Materials,2018,192:50-57.
[4]陶建强,李化建,黄佳木,等.铁路工程大体积混凝土的水化热及裂缝控制[J].铁道建筑,2018,58(1):146-149.
[5]史才军,何平平,涂贞军,等.预养护对二氧化碳养护混凝土过程及显微结构的影响[J].硅酸盐学报,2014,42(8):996-1004.
[6]郭保林,孔祥明.保湿养护方法对混凝土微结构影响的研究[J].混凝土世界,2010(10):54-57.
[7]MASLEHUDDIN M,IBRAHIM M,SHAMEEM M,et al.Effect of Curing Methods on Shrinkage and Corrosion Resistance of Concrete[J]. Construction and Building Materials,2013,41:634-641.
[8]MECHTCHERINE V,GORGES M,SCHROEFL C,et al.Effect of Internal Curing by Using Superabsorbent Polymers(SAP)on Autogenous Shrinkage and Other Properties of a High-performance Fine-grained Concrete:Results of a RILEM Roundrobin Test[J]. Materials and Structures,2013,47(3):541-562.
[9]李磊,刘加平,田倩,等.高性能养护剂的开发及其应用[J].混凝土,2011(6):134-135,142.
[10]KOSMATKA S H,KERKHOFF B,PANARESE W C,et al.混凝土设计与控制[M].钱觉时,唐祖全,卢忠远,等译.重庆:重庆大学出版社,2005.
[11]马慧,陈雪菲,杨娟亚,等.混凝土节水保湿养护膜的制备[J].纺织学报,2013,34(5):12-16.
[12]唐冬汉,姚佳良,刘晓剑,等.混凝土节水保湿养护膜特点及养护应用研究[C]//中国土木工程学会混凝土质量专业委员会.特种混凝土与沥青混凝土新技术及工程应用会议论文集.深圳:中国土木工程学会混凝土质量专业委员会,2012.
[13]高久平,李曼容,曹汝伟.水泥混凝土路面节水保湿养护膜性能试验[J].湖南交通科技,2006,32(2):66-67.
[14]OLAWUYI B J,BOSHOFF W P.Influence of SAP Content and Curing Age on Air Void Distribution of High Performance Concrete Using 3D Volume Analysis[J]. Construction and Building Materials,2017,135:580-589.
[2]YANG J,FAN J,KONG B,et al. Theory and Application of New Automated Concrete Curing System[J].Journal of Building Engineering,2018,17:125-134.
[3]KIM J H,CHOI S W,LEE K M,et al. Influence of Internal Curing on the Pore Size Distribution of High Strength Concrete[J].Construction and Building Materials,2018,192:50-57.
[4]陶建强,李化建,黄佳木,等.铁路工程大体积混凝土的水化热及裂缝控制[J].铁道建筑,2018,58(1):146-149.
[5]史才军,何平平,涂贞军,等.预养护对二氧化碳养护混凝土过程及显微结构的影响[J].硅酸盐学报,2014,42(8):996-1004.
[6]郭保林,孔祥明.保湿养护方法对混凝土微结构影响的研究[J].混凝土世界,2010(10):54-57.
[7]MASLEHUDDIN M,IBRAHIM M,SHAMEEM M,et al.Effect of Curing Methods on Shrinkage and Corrosion Resistance of Concrete[J]. Construction and Building Materials,2013,41:634-641.
[8]MECHTCHERINE V,GORGES M,SCHROEFL C,et al.Effect of Internal Curing by Using Superabsorbent Polymers(SAP)on Autogenous Shrinkage and Other Properties of a High-performance Fine-grained Concrete:Results of a RILEM Roundrobin Test[J]. Materials and Structures,2013,47(3):541-562.
[9]李磊,刘加平,田倩,等.高性能养护剂的开发及其应用[J].混凝土,2011(6):134-135,142.
[10]KOSMATKA S H,KERKHOFF B,PANARESE W C,et al.混凝土设计与控制[M].钱觉时,唐祖全,卢忠远,等译.重庆:重庆大学出版社,2005.
[11]马慧,陈雪菲,杨娟亚,等.混凝土节水保湿养护膜的制备[J].纺织学报,2013,34(5):12-16.
[12]唐冬汉,姚佳良,刘晓剑,等.混凝土节水保湿养护膜特点及养护应用研究[C]//中国土木工程学会混凝土质量专业委员会.特种混凝土与沥青混凝土新技术及工程应用会议论文集.深圳:中国土木工程学会混凝土质量专业委员会,2012.
[13]高久平,李曼容,曹汝伟.水泥混凝土路面节水保湿养护膜性能试验[J].湖南交通科技,2006,32(2):66-67.
[14]OLAWUYI B J,BOSHOFF W P.Influence of SAP Content and Curing Age on Air Void Distribution of High Performance Concrete Using 3D Volume Analysis[J]. Construction and Building Materials,2017,135:580-589.