The Alkali and Temperature Resistance of Some Fibres

Porous concrete needs to be reinforced to improve its strength, frost-resistance, durability etc. An alkaline media (pH = 12.6) is formed during the production of porous autoclave concrete, so the reinforcing fibres should be stable to alkali and temperature influence (up to 180DGC). The resistance to these factors of four different fibres (mineral and kaolin wool, carbon and polypropene fibres) was investigated using X-ray diffraction and scanning electron microscopy (SEM). It was determined that kaolin wool cannot be recommended for use as a reinforcing agent during the formation of porous concrete. The others investigated fibres might be used for these purposes.