Aberthaw tests of concrete in sea water . ?iSS. Sample No. 20 Proportions 1 Cement3 Sand6 Stone275 lb. Water Cast norma], January 14, were removed January l(i,1909. Specimen immersed February-23, 1909. When cast qual^tamping. ed with light Length 16 ft. Average sec-tional area sq. ft. Volume cu. ft. Net Volume ofConcrete Gross Weight 4165 lb. Net Weight ofConcrete Do. per cu. ft. Condition March 3, 1910 A slight roughness showed on thefront face. Condition December 17, 1913 Very slightly flaked on all foursides between low water and half wayto high wat

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Aberthaw tests of concrete in sea water . ?iSS. Sample No. 20 Proportions 1 Cement3 Sand6 Stone275 lb. Water Cast norma], January 14, were removed January l(i,1909. Specimen immersed February-23, 1909. When cast qual^tamping. ed with light Length 16 ft. Average sec-tional area sq. ft. Volume cu. ft. Net Volume ofConcrete Gross Weight 4165 lb. Net Weight ofConcrete Do. per cu. ft. Condition March 3, 1910 A slight roughness showed on thefront face. Condition December 17, 1913 Very slightly flaked on all foursides between low water and half wayto high water. Below water, eaten ina few small spots for j-g inch or all slightly eaten. Condition June 9, 1920 FiUcd on all faces from liTgTf tide tobottom. Front corners badly corners badly pitted, but notgone. Fine aggregate somewhat rottenbetween high and low water.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectconcret, bookyear1920