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- W622741625 abstract "Four-inch (10-cm) concrete cubes were cast by using conventional portland cement concretes with a water-to-cement ratio of 0.35, 0.44, and 0.54 and polymer-modified concretes made with latex and epoxy modifiers. Four-inch cubes were also cut from latex-modified shotcrete repairs in the field. All cubes were immersed for 21 days in 15 percent NaCl solution and then stored in a controlled-climate room in accordance with the test procedures described in NCHRP Report 244. During 21 days of soaking and 21 days of final air drying, weight gains and losses were determined at 3, 7, 14, and 21 days during each period. Following air drying, powder samples were removed by drilling at several intervals of depth from the center of each face to the center of the cube. Then half of each cube was crushed to powder and the acid-soluble chloride ion contents of all samples were measured by a potentiometric titration procedure. At a depth of 1 1/2 to 2 in. (37 to 50 mm), the latex-modified concretes had the least amount of chloride. Laboratory tests of the influence of high temperature and wind on hand-placed and on form-cast large vertical repairs using the modified concretes showed that under arid conditions, the hand-placed repairs always cracked. Accelerated-weathering tests on small repairs made with the polymer-modified concretes left the repairs intact. On the basis of these test results, the acrylic latex modified cast-in-place concrete was successfully used to repair columns, spandrels, and balcony slabs of a high-rise housing complex and modified shotcrete acrylic latex was used to repair underground garages. Both types of repairs were in excellent condition after 5 years' service." @default.
- W622741625 created "2016-06-24" @default.
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- W622741625 date "1986-01-01" @default.
- W622741625 modified "2023-09-24" @default.
- W622741625 title "LABORATORY INVESTIGATION OF CONVENTIONAL AND POLYMER-MODIFIED CONCRETES AND THEIR USE FOR REPAIRS" @default.
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