Abstract. The paper presents the results of theoretical and experimental studies of structural strength and strength at the age of 28 days of vibrovacuumized and vibrated concrete. Structural strength is very important when moulding prefabricated or monolithic structures with immediate dismantling. Regularities of removal of a part of tempering water (liquid phase) from vibrovacuumized concrete mix, having capillaries of various form (round, square, formed by three or four cylinders), narrowing and expanding capillaries, and also capillaries of variable cross-section (with areas that expand and contract), are established as a result of researches. In such capillaries, the value of the capillary pressure is different and, accordingly, at different values of the external pressure, the liquid phase is removed. Also the value of breakdown pressure at which the liquid phase is removed from capillaries of variable section and with sites of small diameter is calculated. The high structural strength of vacuum concrete is theoretically substantiated. The results of experimental studies confirmed the theoretical developments and showed that the structural strength of freshly moulded vacuum c
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