A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Effect of Calcium Chloride on Cement-Aggregate Reaction in Concrete
An investigation was performed to determine what effect various amounts of calcium chloride would have on cement-aggregate reaction for three classes of concrete (47B, AX and 47B PS) used in Nebraska highways. Concretes were prepared with 0, 1, 2, and 4 percent calcium chloride for classes 47B and AX, and with 0 and 2 percent for class 47B PS. The initial curing for classes 47B and AX was moist storage, and for class 47B PS it was steam curing. After the initial curing, durability tests were made on 3 x 4 x 16-inch beams subjected to various exposure conditions. This included the following: continuous moist curing, outdoor exposure, directional freezing and uniform thawing, and alternate wetting and drying. Compressive strengths were determined on moist cured specimens at ages of 7, 28, 90, and 365 days. The following are some of the conclusions drawn from these tests: (1) calcium chloride increases strength of the cncrete at all ages for all mixes; (2) calcium chloride was not detrimental to durability of steam-curred concrete, subjected to any exposure; (3) class AX concrete was less durable in freezing and thawing and wetting and drying when calcium chloride was used; (4) additions of 4 percent calcium chloride should be avoided because of the accelerated set.
The Effect of Calcium Chloride on Cement-Aggregate Reaction in Concrete
An investigation was performed to determine what effect various amounts of calcium chloride would have on cement-aggregate reaction for three classes of concrete (47B, AX and 47B PS) used in Nebraska highways. Concretes were prepared with 0, 1, 2, and 4 percent calcium chloride for classes 47B and AX, and with 0 and 2 percent for class 47B PS. The initial curing for classes 47B and AX was moist storage, and for class 47B PS it was steam curing. After the initial curing, durability tests were made on 3 x 4 x 16-inch beams subjected to various exposure conditions. This included the following: continuous moist curing, outdoor exposure, directional freezing and uniform thawing, and alternate wetting and drying. Compressive strengths were determined on moist cured specimens at ages of 7, 28, 90, and 365 days. The following are some of the conclusions drawn from these tests: (1) calcium chloride increases strength of the cncrete at all ages for all mixes; (2) calcium chloride was not detrimental to durability of steam-curred concrete, subjected to any exposure; (3) class AX concrete was less durable in freezing and thawing and wetting and drying when calcium chloride was used; (4) additions of 4 percent calcium chloride should be avoided because of the accelerated set.
The Effect of Calcium Chloride on Cement-Aggregate Reaction in Concrete
1965
13 pages
Report
No indication
English
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