ДИСПЕРСНО–АРМОВАНИЙ ЛИТИЙ КЕРАМЗИТОБЕТОН НА МЕХАНОАКТИВОВАНОМУ ШЛАКОПОРТЛАНДЦЕМЕНТІ

Abstract

The paper examines the properties of dispersed-reinforced cast expanded clay concrete on mechanically activated slag Portland cement with the addition of Super-PC polycarboxylate superplasticizer. Experimental studies have established the possibility of obtaining lightweight concrete based on high-mobility lightweight concrete mixtures with a diameter of a cone of at least 50 cm. It has been experimentally confirmed that the hydrophobization of expanded clay gravel helps to increase the spreading of the cone of the concrete mixture, and also increases the viability of the concrete mixture. The expediency of mechanical activation of slag Portland cement in the presence of Super-PC to obtain light concrete with increased characteristics in terms of frost resistance, abrasion and impact strength is shown. The results of research are presented, which indicate that the introduction of basalt fiber into slag Portland cement together with the mechanical activation of the binder allows to reduce the abrasion of concrete from 0.44 to 0.13 g/cm2, as well as to increase the impact strength of concrete by almost 2 times (compared to with control). The proposed complex of recipe-technological influences allows to ensure frost resistance of concrete not less than 350 cycles of alternating freezing and thawing. It was established that the mechanical activation of the binder causes an increase in the strength of concrete at the age of 3 days from 11.3 to 16.2 MPa, that is, by more than 40% compared to the control. The introduction of basalt fiber in the amount of 1% of the mass of the binder ensures an increase in the strength of concrete by 10-15%. The joint effect on slag Portland cement of mechanical activation, additives of poly-carboxylate Super-PC and basalt fiber causes an increase in the strength of concrete at the age of 28 days (compared to the control) from 11.3 to 29.5 MPa, i.e. more than 2.5 times. In general, the combined use of the listed recipe-technological factors ensures an increase in the main physical and mechanical characteristics of lightweight concrete.