高温后高强混凝土剪切强度与细观结构

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发布时间：2022-07-22

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摘要：通过高温后高强混凝土（HSC)试件的 push-off 试验，研究了温度和混凝土抗压强度对 HSC
剪切强度的影响.其于前切面细的变化.分析了高温后HSC剪切强度变化的机理，研究了
高温后HSC骨料断梨率与剪切强度的关系.结果表明：常温下HSC抗压强度为64.7.94.0 MPa
时，200℃SC前切强度较常温时分别略有减小和略有增大：超过200 Ch.HSC前切强度随
温度的升高而降低;无论经历多高的温度,混凝土的抗压强度越高,则 HSC剪切强度越大:HSC试
件剪切面上的骨料斷裂率隨溫度的升高而减小,随混凝土扰压强度的增加而增大.最后,建立了高
温后HSC的骨料咬合模型。
关键词：高强混凝土；高温；剪切强度；细观结构；骨料断裂率；骨料咬合
中图分类号：TU528.31；TU375文献标志码:A doi:10.3969/j.issn.1007-9629,2015,06.007
Shear Strength and Meso-structure of High Strength Concrete
after Elevated Temperatures
LIZhitoeils, XIAOJianzhuang1.3, SUN Zhenping
(1. Departrnent of Structural Engineering, Tongji University，Shanghai 200092,China: 2.Key Laboratory of
Advanced Civil Engineering Materials of Ministry of Education, Tongji University , Shanghai 201804 , China
3. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306，Chinal
Abstract: Push-off tests for high strength concrete(HSC) specimens after elevated temperatures were car
ried out to study the effect of elevated temperature and concrete compressive strength on shear strength of
HSC. Based on the variation of the meso-structure of HSr plane, the mechanism tor shear strength
change of HSC after elevated temperatures was investigated. The relationship between aggregate fracture
rate and shear strength of HSC after elevated temperatures was discussed. Results show that when the
compressive strengths are 64.7,94.0 MPa at room temperature, the shear strengths of HSC after 200 ℃
have a little decrease and a little increase compared with that at room temperature, respectively. when the
elevated temperature exceeds 200 C, the shear strength of HSC reduces with the increase of the elevated
temperature, The higher the compresslve strength of concrete (at any temperature) is, the greater the
shear strength will be. The aggregate fracture rate of HSC shear plane decreases as the elevated tempera
ture rises and it will increase as the concrete compressive strength increases. At last, the aggregate inter
lock model for HSCafterelevatedtemperatures is proposed.
Key words：high strength concrete(HSC)；elevated temperature；shear strength；meso-structure：aggre
gate fracture rate；aggregate interlock