Show GAS TAR GAS TAR WILL PROTECT CONCRETE j Bureau of Public Roads Gives Results Results Results Re Re- of Tests Fluid Product By-Product of Artificial Gas Plants Proven Satisfactory In Preserving Drain Tile Against Alkali Prepared br by bJ the th United Unlit States Stale D Department of Agriculture In Its f search for fur u means menns of protecting protecting protecting pro pro- Portland cem cement nt concrete against the action of alkaline waters the bureau of ot public roads United States Department of Agriculture announces announces announces an an- promising results from tr treatment treatment treat treat- nt ment anent with a n ver very fluid crude gas later tar such uch as us mo may be obtained as u a b byproduct byproduct by by- product from many artificial gus gas plants So successful have the tho tests been that further l In investigations of or the resisting alkali properties f t f tar- tar treated concrete and mortar are arc under underway underway way yay and the protective effect of wa wn water way ter tel gas tar on mass maSs maSs' concrete tures tur Is being studied I. I e t iJ J r. r The treatment consists of simply Immersing Immersing Im Im- the concrete In the liquid which Is soaked up even en b by n a dense concrete Cement drain tile the treated In this wa way and stored from six to el eight ht months in a u stron strong alkali solution solution solution tion have hu shown no indication of ot disIntegration disintegration disintegration dis dis- integration and samples tested for tensile strength were as ns strong as os those stored In pure water On the theother theother theother other hand untreated samples showed both disintegration ont and a loss of strength In certain parts of the country when alkali salts exist concrete drain the and concrete structures have been attacked In many such places concrete concrete con con- crete Is n a nery very ery desirable material on account of the accessibility of the materials materials ma ma- that go Into It The bureaus bureau's Investigations aim to to d devise lse t r means menns of using concrete with assurance e. e |