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首页> 外文期刊>Magazine of Concrete Research >Characterisation of damage due to abrasion in SCC by acoustic emission analysis
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Characterisation of damage due to abrasion in SCC by acoustic emission analysis

机译：通过声发射分析表征SCC磨损造成的损坏

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This investigation evaluates and compares the abrasion resistance of various concrete types by means of acoustic emission (AE) analysis. Normal concrete, self-consolidating concrete (SCC) and SCC with variable supplementary cementing materials (SCMs) were tested under the rotating cutter method for abrasion resistance. The effect of using different SCMs in SCC mixtures including fly ash, metakaolin (MK), silica fume and slag on the abrasion resistance of SCC was examined. In conjunction with the abrasion testing, AE monitoring was simultaneously conducted on all mixtures using AE attached sensors. AE parameters such as signal amplitude, signal strength, number of hits, duration and cumulative signal strength (CSS) were collected during the abrasion tests. Three additional parameters were determined through further analyses: b-value, severity (S-r) and historic index (H(t)). Results from the abrasion tests indicated that the SCC mixture containing MK had the highest abrasion resistance among all tested mixtures. The studied AE parameters including CSS, number of hits, b-value, H(t) and S-r were well correlated to the extent of abrasion damage in all tested specimens. The progression of abrasion damage was associated with increased AE activities indicated by high fluctuations in the b-value and H(t) along with ever-increasing values of CSS, number of hits and S-r. The AE intensity analysis quantified which ranges for H(t) and S-r would indicate the extent and severity of the damage due to abrasion by means of developed damage classification charts.
机译：这项研究通过声发射（AE）分析评估并比较了各种混凝土的耐磨性。普通混凝土，自密实混凝土（SCC）和具有可变补充胶结材料（SCM）的SCC在旋转切割机方法下进行了耐磨性测试。研究了在粉煤灰，偏高岭土（MK），硅粉和矿渣等SCC混合物中使用不同的SCM对SCC耐磨性的影响。结合磨损测试，使用附有AE的传感器对所有混合物同时进行AE监测。在磨耗测试中收集了AE参数，例如信号幅度，信号强度，命中次数，持续时间和累积信号强度（CSS）。通过进一步分析确定了三个附加参数：b值，严重性（S-r）和历史指数（H（t））。磨损测试的结果表明，在所有测试混合物中，含MK的SCC混合物具有最高的耐磨性。所研究的AE参数包括CSS，命中次数，b值，H（t）和S-r与所有测试样品中的磨损损伤程度均具有良好的相关性。磨损损伤的进展与AE活动的增加有关，这由b值和H（t）的高波动以及CSS，击中次数和S-r的值不断增加所表明。 AE强度分析量化了H（t）和S-r的范围，这将通过开发的损伤分类图指示由于磨损引起的损伤的程度和严重性。

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