mso-hansi-font-family:"Times New Roman"">透水时效试验方法
mso-hansi-font-family:"Times New Roman"">一、砂基透水砖透水时效过滤罩试验设备及材料:
1、设备:透水速率测试仪、干燥箱、过滤罩(100 mso-hansi-font-family:"Times New Roman"">×100mm "Times New Roman"">)。
2、材料:用高岭土粉和去离子水调配的模拟道路径流水样,粉和水的比例为8g/L mso-hansi-font-family:"Times New Roman"">。
mso-hansi-font-family:"Times New Roman"">二、砂基透水砖透水时效过滤罩试样:
mso-hansi-font-family:"Times New Roman"">试样数量为5 "Times New Roman"">块。
mso-hansi-font-family:"Times New Roman"">三、砂基透水砖透水时效过滤罩试验:
1、将试样放入干燥箱,烘干至质量变化不超过0.1% mso-hansi-font-family:"Times New Roman"">;
2、将试样在水中浸泡20min mso-hansi-font-family:"Times New Roman"">取出;
3、将过滤防护罩压紧在试样的上表面,向罩内缓慢倒入搅拌均匀的模拟水样250L mso-hansi-font-family:"Times New Roman"">;待试样无明显渗出水时,将其放入干燥箱中烘干至质量变化不超过0.1% mso-hansi-font-family:"Times New Roman"">。
4、将过滤烘干的试样取出放至室温,浸泡20min mso-hansi-font-family:"Times New Roman"">取出,按透水速率试验方法测试试样的透水速率V1 mso-hansi-font-family:"Times New Roman"">;
5、如V1 mso-hansi-font-family:"Times New Roman"">大于或等于1.5mL/ "Times New Roman"">(min·cm2 mso-hansi-font-family:"Times New Roman"">),则重复以上步骤,直至第N "Times New Roman"">次透水速率Vn "Times New Roman"">小于1.5mL/ "Times New Roman"">(min·cm2 mso-hansi-font-family:"Times New Roman"">),N-1 "Times New Roman"">即为试样的透水时效。