Severe warping occurred of decorative, precast, white concrete panels fixed to the frames of some building in Perth, Western Australia. Measurements of cyclic shrinkage and expansion, and petrographic, XRD, and SEM examinations showed that the concrete expanded irreversibly due to cracking and subsequent healing. This behaviour is attributed to the lack of sand and excess of cement in the mix design. Inclusion of sand in the mix eliminated the problem. In laboratory experiments, concrete made with white cement and ordinary Portland cement behaved similarly and indicated that the warping was not due to the use of white cement, as had been previously suggested.