Building Materials and Products
DOI: http://www.dx.doi.org/10.24866/2227-6858/2019-4-15
Kotova K.
KRISTINA KOTOVA, Senior Lecturer, AuthorID: 978811, SPIN: 9278-2688,ORCID: 0000-0003-0032-7989, e-mail: kottova-k@yandex.ru
Department of Design of Вuildings and Constructions
Voronezh State Technical University
84, 20-letiya Oktyabrya St., Voronezh, Russia, 394006,
The influence of the characteristics of the foam concrete macroporous structure
on the parameters of its adhesion to reinforcement
Abstract: Foam concrete has a macroporous structure, which can affect not only the occurrence of corrosion in metal reinforcement, but also the cohesion strength – a characteristic of reliable operation of constructive elements. For the purpose of designing the foam concrete structural elements, the assessment of foam concrete structural characteristics and the degree of their influence on the cohesion strength with various types of reinforcement has been carried out. The article presents the study results of the foam concrete structure in the range of its average density from 1200 to 1600 kg/m3 by morphometric identification method. Quantitative data on the influence of foam concrete struc-tural characteristics on the previously experimentally determined cohesion parameters by the pull-out test of the bar from a concrete cube was obtained. It was established that with an increase in the average density of foam concrete in the range of 1200–1600 kg / m3, the area of the contact zone at the foam concrete – reinforcement boundary increases from 0.64 to 0.74 m2/m2. As a result, the increase of cohesion strength with an increase in the average density of concrete in the density range studied was from 21 to 66%, depending on the type and diameter of the reinforcement. Therefore, the criterion characteristic of the foam concrete macroporous structure is the surface area of the interstitial partitions Si.p, because when it increases, the cohesion strength values of composite bars and metal reinforcement increase from 21 till 66%. It has been established that the glass composite fittings cohesion strength with foam concrete of average density from 1200 to 1600 kg/m3 is 20–45% higher than the cohesion strength values obtained for basalt composite fittings and metal reinforcement. Increasing the diameter of the reinforcing bar leads to a decrease of the side surface area ratio from 9.7 to 4.6%, as a result the cohesion strength value is reduced.
Keywords: foam concrete, composite fittings, reinforcement, cohesion parameters, structural characteristics of foam concrete.
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