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Author: Waterways Experiment Station (U.S.). Publisher: ISBN: Category : Concrete Languages : en Pages : 50
Book Description
Fourteen groups of concrete masonry units were tested for drying shrinkage by CRD-C 73. During the drying period, samples were tested for moisture condition by the relative humidity method (CRD-C 76). The tests were performed at six Corps of Engineers laboratories. The relation between shrinkage, expressed as length change, percent, and equilibrium relative humidity was studied. No single pattern was apparent. Units at modified British equilibrium which would be expected to be in equilibrium with 21% relative humidity were found by test to be in equilibrium with relative humidities from 0.0 to 33.5%. Further study is recommended. (Author).
Author: Waterways Experiment Station (U.S.). Publisher: ISBN: Category : Concrete Languages : en Pages : 50
Book Description
Fourteen groups of concrete masonry units were tested for drying shrinkage by CRD-C 73. During the drying period, samples were tested for moisture condition by the relative humidity method (CRD-C 76). The tests were performed at six Corps of Engineers laboratories. The relation between shrinkage, expressed as length change, percent, and equilibrium relative humidity was studied. No single pattern was apparent. Units at modified British equilibrium which would be expected to be in equilibrium with 21% relative humidity were found by test to be in equilibrium with relative humidities from 0.0 to 33.5%. Further study is recommended. (Author).
Author: E. E. McCoy Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
Fourteen groups of concrete masonry units were tested for drying shrinkage by CRD-C 73. During the drying period, samples were tested for moisture condition by the relative humidity method (CRD-C 76). The tests were performed at six Corps of Engineers laboratories. The relation between shrinkage, expressed as length change, percent, and equilibrium relative humidity was studied. No single pattern was apparent. Units at modified British equilibrium which would be expected to be in equilibrium with 21% relative humidity were found by test to be in equilibrium with relative humidities from 0.0 to 33.5%. Further study is recommended. (Author).
Author: ER. Berg Publisher: ISBN: Category : Bricklaying Languages : en Pages : 5
Book Description
A laboratory method for the evaluation of concrete masonry unit (CMU) mix designs is proposed. The zero slump requirement and the unique method of molding CMU using simultaneous vibration and compression on an automated assembly line basis make CMU mix design a unique subset of concrete mix design. The compression and vibration of a block machine is simulated by the use of a drop hammer to compact the test specimens. The different compaction methods are equated by modifying the height of the hammer drop or the number of drops to obtain the same density as that obtained from the production block machine. The volumetric fill method of a production machine is replaced with weighing the mix placed in each mold prior to compaction to provide a uniform amount of material. Numerous batches can be made quickly in a laboratory using small amounts of material on a cost-effective basis. Two-inch (50-mm) cubes for strength testing based upon modified ASTM C 109 (Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)) procedures, and 1-in. (25-mm) square bars for change of length testing based upon modified ASTM C 157 (Test Method for Length Change of Hardened Hydraulic-Cement Mortars and Concrete) procedures can both be made using standard molds and testing equipment.
Author: Waterways Experiment Station (U.S.).
Author: Waterways Experiment Station (U.S.).
Author: E. E. McCoy
Author: Waterways Experiment Station (U.S.)
Author: 
Author: Robert C. Mack
Author: American Society for Testing and Materials
Author: ER. Berg
Author: California Concrete Masonry Technical Committee
Author: A. Huizer
Author: Jesse Charles Saemann