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Concrete Wear Tests and Surface Durability
Description
Concrete wear tests show how well a surface can stand up to abrasion and long-term use. Abrasion is the wearing away of a material by rubbing, scraping, or contact with moving solids. This property matters because concrete surfaces can lose material under vehicle traffic or when solids carried in water brush against them.
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Transcript
混凝土磨损可能由车辆在表面行驶造成,也可能由水中磨蚀性固体引起,后者会侵蚀渠道衬砌。
喷砂试验通过从距离混凝土样品4英寸处、以90 psi的压力,使用0.25英寸喷嘴喷射2000个符合ASTM No. 20规格的钢丸,来评估混凝土因水中固体物质造成的侵蚀情况。
在旋转圆盘试验中,三块平板以每秒0.2个周期的频率作圆周运动,同时每块平板还以其自身轴线为中心以每秒4.7个周期的频率旋转。碳化硅作为平板与混凝土之间的磨料物质。
钢球磨耗试验通过钢球对旋转的压头施加作用力,压头与混凝土之间由钢球隔开;试验过程中使用循环水清除被磨下的材料。
修整轮测试采用改装的钻床,将力施加于三组共七个与样品接触的旋转轮上,驱动头以每秒0.93个周期的频率...
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