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The concept of localization during the postpeak of compressive strain softening is presented. To explore localization in compression, a feedback-control method using a linear combination of displacement and force that partially subtracts the elastic response of the specimen to give a stable feedback signal is used. Results are presented from two test series (45 and 90 MPa) that use this method to test cylinders with length-to-diameter ratios ranging from 2.0 to 5.5 It is shown that compressiondoi:10.1061/(asce)0733-9399(1997)123:1(25) fatcat:yyjxjqopyvglvifnla2ssjs7u4