Modified low-alkalinity sulphoaluminate cement

Abstract

The invention discloses modified low-alkalinity sulphoaluminate cement, which is a hydraulic cementing material prepared by the following steps: forging raw materials including proper elements to obtain 55-70% of clinker which takes anhydrous calcium sulphoaluminate (C3A3S), dicalcium silicate (C2S) and tetracalcium aluminoferrite (C4AF) as main mineral elements, using 5-10% of lithium residues asa modifier, adding a proper amount of 8-15% of anhydrite, 15-20% of mixing material and 0.05-0.2% of adjusting setting agents, and grinding to prepare the cement. The invention has the advantages ofsimple preparation technique, easily guaranteed quality, industrial waste residue recycle, low energy consumption, low cost, environment protection, good performances of low alkalinity, early and highstrength, microdilatancy, cracking resistance, freezing resistance, impermeability, anti-carbonization, abrasion resistance, flushing resistance, good adhering capability, adjustable primary time offinal setting, good slurry fluidity, good coherence in water and wide application range.

Description

technical field [0001] The invention belongs to building materials, in particular to a modified low-alkalinity sulphoaluminate cement. Background technique [0002] At present, low-alkalinity sulfoaluminate cement is anhydrous calcium sulfoaluminate (C 4 A 3 S), dicalcium silicate (C 2 S) is made of clinker composed of main minerals, and then mixed with appropriate amount of gypsum and mixed material (limestone). [0003] Low-alkalinity sulfoaluminate cement and alkali-resistant glass fiber are used to produce fiber-reinforced cement products. This is an ideal new building material and product at present. It is mainly used for the production of interior and exterior composite wall panels and various special-shaped components. tiles, grid panels, bathroom boxes, various ventilation ducts, bathtubs and various architectural sketches. The low-alkalinity sulphoaluminate cement has higher requirements on raw materials. Al is required 2 o 3 High-grade bauxite resources with...

AI Technical Summary

Problems solved by technology

Al is required 2 o 3 High-grade bauxite resources with a content of about 70%, the main minerals in the fired clinker are anhydrous calcium sulfoaluminate with a content of 56-68%, dicalcium silicate with a content of 20-25%, and a content of tetracalcium aluminoferrite Lower than 10%, although the low-alkali cement produced has the advantages of early strength, micro-expansion, low dry shrinkage, and low alkalinity, but its performance in carbonization, abrasion, wear, erosion, and cracking is relatively low. Poor, the surface of the product is easy to "sand" and "powder" and fall off

Its fluidity is not good during use, and it is often solved simply by adding water, which can easily lead to serious bleeding of concrete, serious segregation of cement slurry, sand and stone aggregates, seriously affecting the strength of components, and even leading to scrapping of components

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