Author(s):
C. Kanabar, W.B. Ledbetter
Publication Date
December 1966
Abstract
The scope of this research study was to extend the knowledge gained from previous studies on the durability of structural lightweight concrete, and to attempt to correlate (a) degree of pre-wetting of the synthetic lightweight coarse aggregate, (b) type of synthetic light- weight coarse aggregate, (c) compressive strength of lightweight concrete and (d) the freezer-thaw durability of lightweight concretes made with these aggregates; utilizing the results obtained from prior research, together with research carried out in this investigation. Concrete specimens made with selected synthetic coarse lightweight aggregates were subjected to freezing in air and thawing in water. An analysis of the data indicates that results were obtained on the effects of all the variables included in this investigation, and although the number of tests was not sufficient to draw final conclusions following tentative conclusions were suggested:|1. The degree of aggregate pre-wetting has a definite effect on the freeze-thaw durability of the concretes tested. Excessive aggregate pre-wetting is extremely detrimental to the freeze-thaw durability of the concretes tested and, for the aggregates investigated herein, should be avoided in exposed conditions.|2. All the three aggregates tested have more or less similar effects on the freeze-thaw durability of the resulting concretes.|3. A trend is revealed indicating that when the total water absorbed in the aggregate in terms of percent absolute void volume exceeds around 85 to 90 percent, the resulting concrete fails rapidly under the type of freeze-thaw tests employed in this study.|4. The hydraulic pressure concept may not always provide the full explanation for disruptive action from freezing and thawing.|These conclusions are entirely dependent upon the conditions under which this research was conducted and should not be further generalized.
Report Number:
81-2
Link(s):
Document/Product
http://tti.tamu.edu/documents/81-2.pdf
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