混凝土材料物理性能的空间非均匀性表现
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摘要
采用切片法测试经历不同潮湿养护历程的混凝土在垂直于表面不同深度处的回弹硬度、气体渗透系数和吸水性能.结果表明:早期潮湿养护时间与混凝土材料物理性能的空间均匀性密切相关,早期潮湿养护时间越短,混凝土物理性能空间非均匀性越明显,具体表现为表层混凝土的硬度(强度)越低,抗水、抗气体渗透性越差,且垂直于混凝土表面方向不同深度处的性能差异越显著.
Rebound hardness, gas permeability coefficient and water absorption rate of cut slides of concrete under different wet curing history at different depths on its surface were tested. The results show that the time of early wet curing is closely related to the spatial uniformity of the physical properties of concrete materials. The shorter the time of early wet curing, the lower the hardness(strength) of the surface layer concrete, and the worse the resistance to water and gas permeability, and the more significant the gradient of difference at different depths along the vertical concrete surface.
Rebound hardness, gas permeability coefficient and water absorption rate of cut slides of concrete under different wet curing history at different depths on its surface were tested. The results show that the time of early wet curing is closely related to the spatial uniformity of the physical properties of concrete materials. The shorter the time of early wet curing, the lower the hardness(strength) of the surface layer concrete, and the worse the resistance to water and gas permeability, and the more significant the gradient of difference at different depths along the vertical concrete surface.
引文
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[2] DHIR R K,HEWLETT P C,CHAN Y N.Near surface characteristics of concrete:intrinsic permeability[J].Magazine of Concrete Research,1989,41(147):87-97.
[3] 杨进波,阎培渝.混凝土边界效应层中粗骨料的分布特征[J].建筑材料学报,2009,12(5):580-583,620.YANG Jinbo,YAN Peiyu.Distribution characteristics of coarse aggregate in wall-affecting layer of concrete[J].Journal of Building Materials,2009,12(5):580-583,620.(in Chinese)
[4] WU Z,WONG H S,BUENFELD N R.Influence of drying-induced microcracking and related size effects on mass transport properties of concrete[J].Cement and Concrete Research,2015,68:35-48.
[5] 郭保林.模板衬里改善表层混凝土质量的机理研究[J].建筑材料学报,2011,14(4):512-516.GUO Baolin.Research on mechanism of surface concrete properties improved by controlled permeable formwork liner(CPFL)[J].Journal of Building Materials,2011,14(4):512-516.(in Chinese)
[6] DANG Y D,SHI X M,MERY S,et al.Influence of surface sealers on the properties of internally cured cement mortars containing saturated fine lightweight aggregate[J].Journal of Materials in Civil Engineering,2015,27(12):1-9.
[7] PAN X Y,SHI Z G,SHI C J,et al.A review on surface treatment for concrete—Part 2:Performance[J].Construction and Building Materials,2017,133:81-90.
[8] 王强,石梦晓.养护方式对混凝土表层渗透性的影响[J].清华大学学报(自然科学版),2015,55(2):150-154.WANG Qiang,SHI Mengxiao.Influence of curing conditions on the surface permeability of concrete[J].Journal of Tsinghua University (Science and Technology),2015,55(2):150-154.(in Chinese)
[9] 刘军,陈晓池,邢锋,等.混凝土表层渗水性能的影响因素及作用规律[J].功能材料,2014,45(18):18027-18030.LIU Jun,CHEN Xiaochi,XING Feng,et al.Factors influencing the surface permeability of concrete and their action mechanisms[J].Journal of Functional Materials,2014,45(18):18027-18030.(in Chinese)
[10] 李美利,钱觉时,徐姗姗,等.养护条件对混凝土表面层性能的影响[J].建筑材料学报,2009,12(6):724-728.LI Meili,QIAN Jueshi,XU Shanshan,et al.Effects of different curing conditions on near-surface layer properties of concrete[J].Journal of Building Materials,2009,12(6):724-728.(in Chinese)
[11] EL-SAKHAWY N R,EL-DIEN H S,AHMED M E,et al.Influence of curing on durability performance of concrete[J].Magazine of Concrete Research,1999,51(5):309-315.
[12] RONG M,HAO L,TAN P F.The durability of cover concrete[C]//International Conference on Advances in Concrete and Structures-ICACS 2003.France:RILEM Publications,2003:121-128.
[13] DHIR R K,HEWLETT P C,CHAN Y N.Near-surface characteristics of concrete:Assessment and development of in situ test methods[J].Magazine of Concrete Research,1987,39(141):183-195.
[14] NEVES R,BRANCO F,DE BRITO J.Study on the influence of surface and geometric factors on the results of a nondestructive onsite method to assess air permeability[J].Experimental Techniques,2016,40(3):1109-1116.
[15] SHIMOZAWA K,NAGAYAMA M,IMAMOTO K,et al.A study on the method for evaluating the performance of cover concrete to resist the rebar corrosion in RC structure[C]//Fourth International Symposium on Life-Cycle Civil Engineering.FL,USA:CRC Press-Taylor & Francis Group,2014:1182-1188.
[16] 贾路风,史才军,曹张,等.混凝土渗透性的就地测试方法综述[J].材料导报,2013,27(21):106-111.JIA Lufeng,SHI Caijun,CAO Zhang,et al.A review on methods for in-situ concrete permeability testing[J].Materials Review,2013,27(21):106-111.(in Chinese)
[17] ALSHAMSI A M,IMRAN H.Development of a permeability apparatus for concrete and mortar[J].Cement and Concrete Research,2002,32(6):923-929.
[18] WEI Y,WANG Y Q,GAO X.Effect of internal curing on moisture gradient distribution and deformation of a concrete pavement slab containing pre-wetted lightweight fine aggregates[J].Drying Technology,2015,33(3):355-364.
[19] MEHTA P K,MONTEIRO P J M.Concretemicrostructure,properties,and materials[M].Columbus,OH:The McGraw-Hill,Inc.,2006:61-64.
[20] GALLUCCI E,ZHANG X,SCRIVENER K L.Effect of temperature on the microstructure of calciumsilicate hydrate (C-S-H)[J].Cement and Concrete Research,2013,53:185-195.
[21] GLASSER F P,MARCHAND J,SAMSON E.Durability of concrete—Degradation phenomena involving detrimental chemical reactions[J].Cement and Concrete Research,2008,38(2):226-246.