在一项旨在消除或控制乙烯基内衬石棉水泥（a-C）管道中四氯乙烯浸出的研究项目中，对a-C管道的清洗和水泥内衬进行了研究。通过移除乙烯基衬里并涂抹水泥砂浆衬里，以及直接在乙烯基衬里上涂抹水泥砂浆，可降低四氯乙烯浓度。包括表格、数字。

In a research project aimed at eliminating or controlling the leaching of tetrachloroethylene from vinyl- lined asbestos-cement (A-C) pipe, cleaning and cement- lining of A-C pipes were studied. Tetrachloroethylene concentrations were reduced by removing the vinyl liner and applying a cement-mortar liner, and by applying cement mortar directly over the vinyl liner. Includes tables, figures.