Diatomite Introduction to Building Materials
Key words
Diatomite, Diatomaceous earth, concrete reinforcement, filling of concrete pore structure, frost resistance
Diatomite is a kind of sedimentary rock formed by long-term geological differentiation of rock. Because of its special pore structure, as an external admixture, it can significantly improve the strength of concrete.
Diatomite can fill in the cracks inside the concrete and change the pore structure of the concrete, thereby improving the strength of the concrete and enhancing the compactness and frost resistance of the concrete.
Diatomaceous earth is added to the paint for extinction and odor absorption. The indoor and outdoor coatings, decoration materials and diatom mud produced with diatomite will not emit harmful chemicals, but also improve the living environment. effect.
The chemical composition of diatomite is mainly SiO2, containing a small amount of Al2O3, Fe2O3, CaO, MgO, etc. and organic matter.
The density of diatomite is 1.9-2.3g/cm3, the bulk density is 0.34-0.65g/cm3, the specific surface area is 40-65m2/g, the pore volume is 0.45-0.98cm3/g, and the water absorption rate is 2-4 times of its own volume. The melting point is 1650 -1750 C, and the special porous structure can be observed under the electron microscope.
