超高性能混凝土的自收缩特性研究
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摘要
研究了不同钢纤维体积分数(0、2%、3.5%)的超高性能混凝土(UHPC)在密封养护条件下的线性收缩量、温度变化以及水化放热速率随时间的变化规律。结果表明,超高性能混凝土的自收缩过程可以分为四个阶段,分别由温度和湿度控制,且与温度变化以及水化放热数据匹配良好;钢纤维的掺入不改变收缩发展阶段也不改变各阶段的持续时间,但随着钢纤维掺量的提高,有效抑制了UHPC收缩发展程度;通过MANGAT&AZARI纤维收缩抑制模型模拟UHPC自收缩变化,与实测数据的匹配度良好。
The linear shrinkage deformation, temperature and hydration release rate evolution in ultra-high performance concrete(UHPC) with different volume fractions of steel fibers(0, 2.0% and 3.5%)were studied. The results indicate that four distinct stages are identified on the shrinkage development profile governed by temperature and pore humidity, both of which possess good correlation to shrinkage strain. The addition of steel fibers does not alter the shrinkage pattern in UHPC and reduces shrinkage strain in proportion to the volume fraction of steel fibers. The MANGAT&AZARI model on shrinkage restraining effect is employed to calculate the shrinkage strain in steel fiber reinforced UHPC mixes, which demonstrates good match to the measured results.
The linear shrinkage deformation, temperature and hydration release rate evolution in ultra-high performance concrete(UHPC) with different volume fractions of steel fibers(0, 2.0% and 3.5%)were studied. The results indicate that four distinct stages are identified on the shrinkage development profile governed by temperature and pore humidity, both of which possess good correlation to shrinkage strain. The addition of steel fibers does not alter the shrinkage pattern in UHPC and reduces shrinkage strain in proportion to the volume fraction of steel fibers. The MANGAT&AZARI model on shrinkage restraining effect is employed to calculate the shrinkage strain in steel fiber reinforced UHPC mixes, which demonstrates good match to the measured results.
引文
[1]陈宝春,季韬,黄卿维,等.超高性能混凝土研究综述[J].建筑科学与工程学报,2014,31(3):1-24.
[2]黄政宇,阳东翱.超高性能混凝土基体的组成与微结构关系研究[J].硅酸盐通报,2017(12):4104-4111.
[3]明阳,李顺凯,沈尔卜,等.低水化热低收缩超高性能混凝土(UHPC)试验研究[J].混凝土与水泥制品,2019(3):6-9.
[4]高育欣,沈锐,程宝军,等.钢纤维搭配对超高性能混凝土拌合物性能的影响[J].混凝土与水泥制品,2019(1):55-60.
[5]MENG W N,KAMAL H K.Effect of Hybrid Fibers on Fresh Properties,Mechanical Properties,and Autogenous Shrinkage of Cost-Effective UHPC[J].Journal of Materials in Civil Engineering.2018,30(4).
[6]叶光.稻壳灰抑制超高性能混凝土的自收缩机理分析[J].硅酸盐学报,2012,40(2):212-216.
[7]DAURIAC C.Special concrete may give steel stiff competition[J].The Seattle Daily Journal of Commerce,1997.
[8]JI W Y,AN M Z,YAN G P,et al.Study on Reactive Powder Concrete Used in the Sidewalk System of the Qinghai-Tibet Railway Bridge[C].水泥混凝土技术与可持续发展研讨会,2004.
[9]YAZICI H,YARDIMCI M Y,AYDIN S,et al.Mechanical properties of reactive powder concrete containing mineral admixtures under different curing regimes[J].Construction and Building Materials,2009,23(3):1223-31.
[10]XIE T,FANG C,ALI M S,et al.Characterizations of autogenous and drying shrinkage of ultra-high performance concrete(UHPC):An experimental study[J].Cement and Concrete Composites,2018,91:156-173.
[11]陈宝春,李聪,黄伟,等.超高性能混凝土收缩综述[J].交通运输工程学报,2018(1):13-28.
[12]SHEN P,LU L,HE Y,et al.Experimental investigation on the autogenous shrinkage of steam cured ultra-high performance concrete[J].Construction&Building Materials,2018,162:512-522.
[13]黄政宇,胡功球.热养护过程中超高性能混凝土的收缩性能研究[J].材料导报,2016,30(4):115-120.
[14]覃维祖,曹峰.一种超高性能混凝土-活性粉末混凝土[J].工业建筑,1999(4):16-18.
[15]MANGAT,P S M.Motamedi A.A theory for the free shrinkage of steel fiber reinforced cement matrices.Journal of Materials Science,1984,19(7):2183-2194.
[16]ALKAYSI M,EL-TAWIL S,LIU Z,et al.Effects of silica powder and cement type on durability of ultra-high performance concrete(UHPC),Cement and Concrete Composites.2016,66:47-56.
[17]吴林妹,史才军,张祖华,等.钢纤维对超高性能混凝土干燥收缩的影响[J].材料导报,2017,31(23):58-65.
[2]黄政宇,阳东翱.超高性能混凝土基体的组成与微结构关系研究[J].硅酸盐通报,2017(12):4104-4111.
[3]明阳,李顺凯,沈尔卜,等.低水化热低收缩超高性能混凝土(UHPC)试验研究[J].混凝土与水泥制品,2019(3):6-9.
[4]高育欣,沈锐,程宝军,等.钢纤维搭配对超高性能混凝土拌合物性能的影响[J].混凝土与水泥制品,2019(1):55-60.
[5]MENG W N,KAMAL H K.Effect of Hybrid Fibers on Fresh Properties,Mechanical Properties,and Autogenous Shrinkage of Cost-Effective UHPC[J].Journal of Materials in Civil Engineering.2018,30(4).
[6]叶光.稻壳灰抑制超高性能混凝土的自收缩机理分析[J].硅酸盐学报,2012,40(2):212-216.
[7]DAURIAC C.Special concrete may give steel stiff competition[J].The Seattle Daily Journal of Commerce,1997.
[8]JI W Y,AN M Z,YAN G P,et al.Study on Reactive Powder Concrete Used in the Sidewalk System of the Qinghai-Tibet Railway Bridge[C].水泥混凝土技术与可持续发展研讨会,2004.
[9]YAZICI H,YARDIMCI M Y,AYDIN S,et al.Mechanical properties of reactive powder concrete containing mineral admixtures under different curing regimes[J].Construction and Building Materials,2009,23(3):1223-31.
[10]XIE T,FANG C,ALI M S,et al.Characterizations of autogenous and drying shrinkage of ultra-high performance concrete(UHPC):An experimental study[J].Cement and Concrete Composites,2018,91:156-173.
[11]陈宝春,李聪,黄伟,等.超高性能混凝土收缩综述[J].交通运输工程学报,2018(1):13-28.
[12]SHEN P,LU L,HE Y,et al.Experimental investigation on the autogenous shrinkage of steam cured ultra-high performance concrete[J].Construction&Building Materials,2018,162:512-522.
[13]黄政宇,胡功球.热养护过程中超高性能混凝土的收缩性能研究[J].材料导报,2016,30(4):115-120.
[14]覃维祖,曹峰.一种超高性能混凝土-活性粉末混凝土[J].工业建筑,1999(4):16-18.
[15]MANGAT,P S M.Motamedi A.A theory for the free shrinkage of steel fiber reinforced cement matrices.Journal of Materials Science,1984,19(7):2183-2194.
[16]ALKAYSI M,EL-TAWIL S,LIU Z,et al.Effects of silica powder and cement type on durability of ultra-high performance concrete(UHPC),Cement and Concrete Composites.2016,66:47-56.
[17]吴林妹,史才军,张祖华,等.钢纤维对超高性能混凝土干燥收缩的影响[J].材料导报,2017,31(23):58-65.