Aberthaw tests of concrete in sea water . Sample No, 4 Proportions 1 Cement2K Sand^yi Stone165 lb. Water Cast very dry, January 9, were removed January 11,1909. Specimen immersed March 1,1909. When cast there was no free water,but the surface was moist. Length 10 ft. Average sec-tional area sq. ft. Volume cu. ft. Net Volume ofConcrete Gross Weight 4175 lb. Net Weight ofConcrete Do. per cu. ft. Condition March 3, 1910 Slightly pitted on the sides — moreso on front face, where the finematerial had apparently been eroded,exposing the stones but leaving t

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Aberthaw tests of concrete in sea water . Sample No, 4 Proportions 1 Cement2K Sand^yi Stone165 lb. Water Cast very dry, January 9, were removed January 11,1909. Specimen immersed March 1,1909. When cast there was no free water,but the surface was moist. Length 10 ft. Average sec-tional area sq. ft. Volume cu. ft. Net Volume ofConcrete Gross Weight 4175 lb. Net Weight ofConcrete Do. per cu. ft. Condition March 3, 1910 Slightly pitted on the sides — moreso on front face, where the finematerial had apparently been eroded,exposing the stones but leaving themfirmly embedded. The extreme erosionwas about 1 inch. Condition December 17, 1913 Face badly eaten from high water tobottom — a little worse between highand low water. Aggregate exposed onentire face. Back good — slightlyflaked at mid-water. Sides look asthough specimen had been poorlyspaded — aggregates exposed instreaks. A detailed view of the face is shownon page 32. ^Z Condition June 9, 1920 Bottom seems no worse than in19

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectconcret, bookyear1920