Show GAS TAR TREATMENT PROTECTS CONCRETE bureau of public roads gives results of tests fluid byproduct by product of ef artificial gas ga plants proven satisfactory in preserving drain tile against alkali prepared by bj th the united stile states of 0 agriculture in its search for a means of 0 protecting portland cement concrete against the action of alkaline waters tile bureau of public roads united states department of agriculture announces ari promising results from treatment with a very fluid crude water gas tar such as may be obtained as a byproduct from many artificial gas plants so successful have the tests testa been that further investigations of the alkali resisting properties of tar treated concrete and mortar are inder way and the protective effect ot OE wa ter gas tar on mass concrete tores lures Is being studied the treatment consists of simply ini mertil ng the concrete in the liquid which Is soaked up even by a dense conc concrete Tete cement drain tile treated in this way ond and stored from six to eight months in a strong alkali solution have shown no indication of disintegration and samples tested tor for tensile strength were as strong as those stored in pure water on OB the other hand untreated samples showed both disintegration and a loss ot of strength in certain parts of the country where alkali salts exist concrete drain tile and concrete structures have been at attacked in many such places concrete Is a very desirable material on account of the accessibility of the materials that go into it the bureaus bureau investigations alin aim to devise means mean of using concrete with assurance |