go to jove.com

HIGH SCHOOL

Engineering

Concept Videos

Civil Engineering

This is a free preview. For full access

Strength of Concrete

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.

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...

More videos by Standards