【摘 要】
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In this study we report on the durability of newly developed cement-reduced eco-friendly concretes with high limestone powder content and low water-powder ratios against sulfate attack.This study pres
【机 构】
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Institute of Technology and Testing of Building Materials, Graz University of Technology, Graz 8010,
【出 处】
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The 14th International Congress on the Chemistry of Cement (
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In this study we report on the durability of newly developed cement-reduced eco-friendly concretes with high limestone powder content and low water-powder ratios against sulfate attack.This study presents an update of Mittermayr, Rezvani et al.(2015) and includes new data.For the experiments 3 different cements were applied -namely OPC (CEM I 32.5R), Portland-slag cement (CEM II/A S 52.5N), and BFS cement (CEM III/B 42.5N).Mortar specimens with the same paste composition than eco-friendly concretes were stored in a 30 g l1sodium sulfate solution and saturated Ca(OH)2 reference solution for 200 days at 8℃.After the immersion period the specimens exhibited different degrees of damage reaching from no visual damage to complete destruction.To decipher mechanisms responsible for the outcome of the sulfate test we used standard mechanical methods such as expansion rate and residual compressive strength measurements.In addition microstructural, mineralogical and chemical alteration were investigated by electron microprobe, X-ray diffraction with Rietveld refimement and phase quantification, mercury intrusion porosimetry, and elemental analyses such as total inorganic and organic carbon (TOC).
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