Shrinkage deformation of cement foam concrete

International Scientific Conference of Young Scientists: Advanced Materials in Construction and Engineering

材料科学;土木建筑工程;工业技术

Kudyakov, A.I.^1 ; Steshenko, A.B.^1

Tomsk State University of Architecture and Building, Department Building Materials, Tomsk

634003, Russia^1

关键词: Chrysotile asbestos fibers;    Cylindrical fibers;    Drying shrinkages;    Microstructure investigations;    Perforated walls;    Reinforced Foams;    Shaped particles;    Shrinkage deformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/71/1/012019/pdf
DOI  :  10.1088/1757-899X/71/1/012019

来源: IOP

【 摘 要 】

The article presents the results of research of dispersion-reinforced cement foam concrete with chrysotile asbestos fibers. The goal was to study the patterns of influence of chrysotile asbestos fibers on drying shrinkage deformation of cement foam concrete of natural hardening. The chrysotile asbestos fiber contains cylindrical fiber shaped particles with a diameter of 0.55 micron to 8 microns, which are composed of nanostructures of the same form with diameters up to 55 nm and length up to 22 microns. Taking into account the wall thickness, effective reinforcement can be achieved only by microtube foam materials, the so- called carbon nanotubes, the dimensions of which are of power less that the wall pore diameter. The presence of not reinforced foam concrete pores with perforated walls causes a decrease in its strength, decreases the mechanical properties of the investigated material and increases its shrinkage. The microstructure investigation results have shown that introduction of chrysotile asbestos fibers in an amount of 2 % by weight of cement provides the finely porous foam concrete structure with more uniform size closed pores, which are uniformly distributed over the volume. This reduces the shrinkage deformation of foam concrete by 50%.