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Mortar Constituent of Concrete under Cyclic Compression

机译：循环压缩下混凝土的砂浆组成

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The behavior of the mortar constituent of concrete under cyclic compression was studied and a simple analytic model was developed to represent its cyclic behavior. Experimental work consisted of monotonic and cyclic compressive loading of mortar. Two mixes were used, with proportions corresponding to concretes having water-cement ratios of 0.5 and 0.6. Forty-four groups of specimens were tested at ages ranging from 5 to 70 days. Complete monotonic and cyclic stress-strain envelopes were obtained. A number of loading regimes were investigated, including cycles to a constant maximum strain. Major emphasis was placed on tests using relatively high stress cycles. Degradation was shown to be a continous process and a function of both total strain and load history. No stability or fatigue limit was apparent. Other significant findings indicate that for monotonic loading, the strength of mortar increases with age and decreasing water-cement ratio; that the factors controlling degradation of mortar and concrete are similar; and that the analytical model of mortar matches well with the experimental response of mortar for a number of loading cycles.

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