Influence of Specimen Size on Autogenous Volume Deformation of Long-Aged MgO-Admixed Concrete

The transformation law of autogenous volume deformation MgO-admixed concrete with specimen size was revealed through continuous observation on standard-size (?200 mm × 500 mm), medium-size (?250 and large-size specimens 600 mm) over 6 years. Besides, the pore parameters core samples obtained from in 1st, 3rd, 6th years age were investigated. results show that increases increase MgO content or age. expansion rate decreases after 360 days, tends to be stable about 2 When changes, size. During 2–6 years, medium- is reduced by 6–10 15–20%, respectively, compared under same content. With condition an appropriate content, regardless specimen, structure becomes better growth age, denser denser, caused hydration will not cause damage structures.