Supersulfated Cement Applied to Produce Lightweight Concrete

Abstract

The physical and mechanical characteristics of expanded-clay lightweight concrete based on a supersulfated binder in comparison with lightweight concrete based on ordinary Portland cement were studied. In replacing CEM 32.5 with a supersulfated binder of 6000 cm2/g specific surface, one can increase the tensile strength in bending up to 20% and can increase the ratio of the tensile strength in bending to the compressive strength that indicates the crack resistance increase of concrete. Compressive strengths at the age of 28 days were equal to 17.0 MPa and 16.6 MPa for the supersulfated binder of 3500 cm2/g specific surface and CEM 32.5, respectively. Shrinkage deformation of hardening concrete, indicators of fracture toughness, frost resistance, and thermal conductivity were determined during the experimental works. The coefficient of thermal conductivity decreased up to 12% compared to the use of CEM 32.5. An enhancement in concrete properties was associated with the increase of supersulfated binder fineness.

The Experimental Study of Innovative Methods Regarding the Removal of Sm(III)

“…In particular, the ion flotation method is commercially used for the removal of non-ferrous, rare-earth, and radioactive metal cations from industrial and residential wastewaters [11]. In addition, when using different types of flocculants and coagulants, The work objective is an experimental and thermodynamic study of the possibility of selective REE removal (by the example of Sm +3 ) by adsorptive bubble methods.…”

“…In particular, the ion flotation method is commercially used for the removal of nonferrous, rare-earth, and radioactive metal cations from industrial and residential wastewaters [11]. In addition, when using different types of flocculants and coagulants, wastewater treatment for petroleum and oil impurities by the ion flotation method is possible [12].…”

“…On the achieved technological level, processing of this type of raw materials is unprofitable [6][7][8]. The complex systematic study of the interaction of structural components in nitrate systems of lanthanides of the cerium family and the representatives of the Li, Na, and K chemical group established the formation of the representative class of Ln alkali coordination nitrates [9][10][11]. The findings form the basis for revealing and controlling the phase state of processing facilities in preparatory stages when forming construction material coating layers, as well as the determination of process and functional dependences for changing the composite material properties [12][13][14].…”

Ion Flotation of Ytterbium Water-Salt Systems—An Innovative Aspect of the Modern Industry

“…A special feature of Russian raw material sources is the low REE content and complex chemical and mineralogical composition. The processing of such raw materials is unprofitable [19][20][21][22][23][24][25][26][27]. Furthermore, ore mined at the Kola peninsula (a fairly developed Arctic region in Russia) is used for production of up to 25 concentrates that are different in terms of their composition and properties [28].…”

The Removal of Rare-Earth Metals from Water-Salt Systems – An Innovative Aspect of the Modern Industry

“…A special feature of Russian raw material sources is the REE low content and complex chemical and mineralogical composition. The processing of such raw materials in unprofitable [20][21][22][23][24][25][26][27][28]. Besides, ore mined at Kola peninsular (a fairly developed Arctic Region in Russia) are used for production of up to 25 concentrates that are different in terms of their composition and properties [29].…”