Air-void parameters measurement of fresh concrete and hardened concrete

Air-void parameters measurement of fresh concrete and hardened concrete
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新拌混凝土和硬化混凝土的气孔参数测量

DOI:
10.1007/s11771-013-1590-z
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发表时间:
2013-04
影响因子:
--
通讯作者:
李化建
李化建
中科院分区:
--
文献类型:
--
作者:
李化建

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采用空隙率分析仪(AVA)法和显微镜法研究了不同含气量、坍落度和矿物掺合料(粉煤灰、矿渣、粉煤灰+矿渣、粉煤灰+矿渣+硅灰复合材料)对新拌混凝土和硬化混凝土的含气量、空隙率和比表面积的影响。分析了不同方法测试结果之间的相关性。结果表明,新拌混凝土与硬化混凝土的含气量和空隙率之间存在密切的相关性,而比表面积之间的相关性较弱。AVA法测得的混凝土含气量小于压力法和显微镜法测得的含气量,这是因为AVA装置只能捕捉小于3 mm的空隙。AVA法测得的新拌混凝土的空隙系数大于显微镜法测得的硬化混凝土的空隙系数,但比表面积较小。当采用压力法和显微镜法测得的含气量为4%~ 7%时,AVA法测得的含气量应为2.4%~ 4.6%。对于混凝土F-T耐久性,当细观法测定的间距系数为300 μm时,AVA法测定的间距系数应取360 μm。
Air content, spacing factor and specific surface of fresh concrete and hardened concrete with different air contents, slumps and mineral admixtures (fly ash, slag, fly ash + slag, fly ash + slag + silica fume composite) were studied by the air-void analyzer (AVA) method and the microscopical method. The correlations between the test results obtained from different methods were analyzed. The results show that, there is a close correlation of air content and spacing factor between the fresh concrete and the hardened concrete, but the specific surface correlation is weak. The air content of concrete measured by the AVA method is smaller than that of the pressure method and the microscopical method, because AVA device captures only the air voids with the size smaller than 3 mm. Spacing factor of the fresh concrete measured by the AVA method is greater than that of the hardened concrete measured by the microscopical method, while the specific surface is smaller. When the criterion of 4%–7% air content measured by the pressure method and microscopical method is acceptable for concrete freezing-thawing (F-T) durability in cold weather, the air content measured by the AVA method should be 2.4%–4.6%. For the concrete F-T durability, when the criterion of the spacing factor measured by the microscopical method is 300 μm, the spacing factor measured by the AVA method should be 360 μm.
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