Open AccessThe effect of mineral additives on foam concrete porosity
Author(s) -
Ekaterina Bartenjeva
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/962/2/022023
Subject(s) - wollastonite , materials science , porosity , foam concrete , autoclave , tobermorite , composite material , differential thermal analysis , hardening (computing) , thermal conductivity , volume (thermodynamics) , thermal insulation , foaming agent , cement , chemistry , metallurgy , raw material , physics , organic chemistry , layer (electronics) , quantum mechanics , diffraction , optics
Non-autoclave foam concrete is a promising material for low-rise house construction. It has been found that the addition of mineral additives allows to regulate the porous structure of non-autoclave foam concrete, at the same time the coefficient of thermal conductivity is reduced, density is reduced, and frost resistance is improved. The introduction of dispersed wollastonite and diopsid promotes the formation of conditionally closed pores, their volume increases by 47-49%. The introduction of wollastonite reduces the pore volume with a diameter greater than 0.1 μm by 2.34 times, the introduction of diopsid reduces it by 8.2%. It is noted that the addition of the examined additives enables to obtain closed pores with a glossy surface; it improves the performance characteristics of natural hardening foam concrete. According to the results of DTA (Differential Thermal Analysis) and XRFA (X-ray fluorescence analysis), a more complete hydration of cement is recorded, this fact can indicate the structural and modifying influence of additives as crystallization centers for newgrowths.