Low energy compositions based on inorganic binders
inorganic binders, cellular concrete, aerated concrete
The results of scientific research in realization of energy-intensity cellular concrete production technology of normal condition hardening are shown. Physical-mechanical and thermophysical properties of cellular concretes, which are produced by this technology, are relevant to active normative documents. In this case the produced cellular concretes are characterized with strength increasing in time in compare to autoclave hardening cellular concretes and aerated concrete. The influence of the chemical activity of the fillers on the performance of the final product has been established.
According to the results of the performed researches it is established that the activity of the filler determines the kinetics of change in the time of the strength of the composition, which solidifies under normal conditions. When used as ground coal ash filler, the level of strength of porous concrete at the age of 28 days is at the level of strength of the composition with the addition of ground granulated slag (3,22 and 3,38 MPa, respectively).
It is also found that, unlike autoclaved aerated concretes, the strength of aerated concretes of normal cement based on Portland cement increases over time both on binder without mineral additives and in the presence of ash, milled slag and quartz sand. The intensity of the process of gaining strength over time is determined by the activity of the mineral additive. When used as a mineral admixture of non-ground quartz sand, which, under normal curing conditions, does not interact with the curing of Portland cement, the strength of the porous concrete decreases with increasing amount of this additive in the composition. The intensity of the strength of these compositions at the age of 90 days, depending on the amount of additive, is 10 - 18%.
The proposed technology for the production of cellular concrete based on Portland cement, curing under normal conditions, was implemented in industrial production. D700 concrete was selected as the base for production.
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