Preparation of single-component alkali-activated cement and application method thereof

Abstract

The invention belongs to the novel cement material field and specifically relates to the preparation of a single-component alkali-activated cement and an application method thereof, wherein a raw material 1 including SiO2, Al2O3, and CaO are mixed with the raw material 2 including Na2O in a certain ratio; the ratio should be decided so that the percentage of the weight of each component of the calcined product, which is obtained by calcining the mixed materials at a temperature greater than or equal to 1100 DEG C, in the total weight is as follows: Al2O3: 8-25%; SiO2: 24-55%; CaO: 10-55%; and Na2O +0.658K2O: 6-25%; after being calcined at a temperature ranging from 950-1200 DEG C for 1.5-3 h, the mixed materials are then ground to obtain cement powder; the cement powder is mixed with water into paste; next, the paste is cured at 50-80 DEG C for 2-3 days so that neat cement paste briquettes excellent in strength can be obtained; and the strength can be continuously increased if curing is continuously performed under normal temperature. The preparation of the single-component alkali-activated cement has the following advantages that: the raw material range of the alkali-activated cement is greatly expanded; the storage, transportation and utilization of the cement are more convenient; and the improvement of the cementitious activity of the cement and the reduction of the cost are expected to be realized.

Description

technical field [0001] The invention belongs to the field of new cement materials, and in particular relates to the preparation and application method of a single-component alkali-activated cement. Background technique [0002] In 2011, my country's cement output reached 2.063 billion tons, most of which were Portland cement. The calcination temperature of Portland cement reaches 1450°C, high energy and material consumption, high carbon emissions, serious environmental pollution, poor acid resistance, corrosion resistance and durability, and consumes a large amount of high-quality limestone resources, so its use should be gradually restricted and reduced. The development trend of cement requires wide sources of raw materials, high waste utilization, low energy consumption, low resource consumption, low pollution, low carbon emissions, and good durability and corrosion resistance. Alkali-activated cement, which has been actively studied recently, is a two-component cement co...

AI Technical Summary

Problems solved by technology

However, slag is obtained by water quenching after melting at 1400-1600°C in the iron-making blast furnace. Artificial slag consumes a lot of energy, and the output of slag, a by-product of iron-making, cannot meet the demand for cement, and its composition changes with the needs of iron-making. When a large amount is added to prepare alkali slag cement, the properties of the cement will be unstable (Note: R-monovalent alkali metal oxide, M-divalent alkaline earth metal oxide, A-Al 2 o 3 , S-SiO 2 , C-CaO, H-H 2 O,N-Na 2 O)

Images