Effect of limestone filler BET(H2O)-area on the fresh and hardened properties of self-compacting concrete
Effect of limestone filler BET(H2O)-area on the fresh and hardened properties of self-compacting concrete
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DOI：
10.1016/j.cemconres.2008.03.010
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发表时间：
2008-07
影响因子：
11.4
通讯作者：
Oskar Esping
中科院分区：
文献类型：
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作者：
Oskar Esping
研究了不同比表面积的石灰石填料对自密实混凝土新拌和硬化性能的影响。通过使用水蒸气作为吸附物的简化BET方法测定表面积。采用流变仪和坍落度流动试验对新拌混凝土的流动性进行了测定。用混凝土自收缩仪测定自收缩，用圆环试验测定塑性开裂倾向。在28天时测定抗压强度。发现BET（H2O）-面积的测量可用于评估SCC的恒定可加工性的水需求，其中BET（H2O）-面积的变化为1000 m2/kg对应于约0.8%的水分含量。结果表明，大面积填料可增加自收缩，减少蒸发，降低塑性开裂倾向，提高抗压强度。在额外的水的情况下，结果相反。
This paper presents a study on the use of limestone fillers with different specific surface area and their effect on the fresh and hardened properties of self-compacting concrete (SCC). The surface area was determined by a simplified BET method using water vapour as adsorbate. A rheometer and a slump flow test were used to measure the flowability of fresh concrete. A concrete dilatometer was used to measure the autogenous shrinkage, and a ring-test for the plastic cracking tendency. The compressive strength was determined at 28 days. It was found that the measure of BET(H2O)-area can be used to evaluate the water requirement for constant workability of the SCC, where a change in BET(H2O)-area of 1000 m2/kg corresponds to approximately 0.8% in moisture content. The results showed that filler with a large area will result in an increased autogenous shrinkage, decreased evaporation, lower plastic cracking tendency, and a higher compressive strength. With additional water the results was the opposite.