Preparation method of composite cement with low clinker dosage and high flexural compression ratio

A technology of composite cement and folding ratio, applied in the direction of cement production, etc., can solve the problems of limited application range and dosage, large water demand, low activity, etc., achieve good crack resistance, eliminate increased water demand, and initial porosity low effect

A technology of composite cement and folding ratio, applied in the direction of cement production, etc., can solve the problems of limited application range and dosage, large water demand, low activity, etc., achieve good crack resistance, eliminate increased water demand, and initial porosity low effect

CN101948255BActive Publication Date: 2012-12-05SOUTH CHINA UNIV OF TECH
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  • Preparation method of composite cement with low clinker dosage and high flexural compression ratio
  • Preparation method of composite cement with low clinker dosage and high flexural compression ratio
  • Preparation method of composite cement with low clinker dosage and high flexural compression ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] At present, the dosage and properties of commercially available Portland cement (P.II) and ordinary Portland cement (P.O) are shown in Table 2. The bulk density of Portland cement and ordinary Portland slurry is about 50%, and its 28-day folding ratio is about 0.2.

[0049] Table 2 Proportion and properties of Portland cement and ordinary Portland cement

[0050]

[0051] According to the method of the present invention, the above-mentioned cementing components that meet the "interval narrow distribution" are distributed according to the content of each interval and the type of cementitious material in Table 3, and the prepared composite cement particle distribution is as follows: Figure 5 , Figure 6 shown. Due to the limited classification efficiency of the particle classifier, there is a certain degree of overlap in each interval, and the prepared composite cement with the particle characteristics of "narrow interval distribution and overall wide distribution" ...

Embodiment 2

[0055] Table 4 shows the properties of the composite cement prepared by using the above-mentioned gelling components conforming to the "narrow interval distribution" according to the content of each interval and the type of gelling material in Table 4.

[0056] Table 4 Proportion and performance of composite cement with particle characteristics of "narrow distribution in intervals and wide distribution in the whole"

[0057]

[0058]

Embodiment 3

[0060] Table 5 shows the performance of the composite cement prepared by using the above-mentioned gelling components that meet the "narrow interval distribution" according to the content of each interval and the type of gelling material in Table 5.

[0061] Table 5 Proportion and performance of composite cement with particle characteristics of "narrow distribution in intervals and wide distribution in the whole"

[0062]

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Abstract

The invention discloses a preparation method of composite cement with low clinker dosage and high flexural compression ratio. The preparation method is to mix three size ranges of powder particles and obtain the composite cement. The three size ranges of powder particles are as follows: 1) the grain size of particles is less than 8mu m, the particles are composed of high-activity supplementary cementing material with the grain size; 2) the grain size of particles is 8-24mu m, the particles are composed of cement clinker particles with the grain size; and 3) the grain size of particles is 24-80mu m, and the particles are composed of low-activity supplementary cementing material or inert filler. The volume percentages of the three size ranges of powder particles are 25-40%, 25-30% and 30-45% respectively. The clinker volume percentage of the composite cement is 25-30%, the 28-day compressive strength is up to 35-50MPa, the flexural strength is up to 10-12Mpa, the flexural compression ratio is 1 / 3-1 / 4; and the composite cement has low hydration heat and good anti-cracking capability and can be used in the civil construction / engineering with the demand on the anti-cracking capability.

Description

technical field [0001] The invention relates to a preparation method of composite cement, in particular to a preparation method of low clinker consumption and high folding ratio composite cement. Background technique [0002] Cement concrete is currently the most widely used man-made building material. The production of Portland cement needs to consume a large amount of natural resources and energy, and the inconsistency between resources and the environment is getting worse day by day. In 2009, my country's cement production reached 1.65 billion tons, accounting for 55% of the world's total cement production, consuming 1.46 billion tons of limestone, 240 million tons of clay, about 182 billion kW h of electricity, more than 190 million tons of standard coal, and emitting CO 2 More than 1 billion tons, SO x More than 480,000 tons, NO x More than 1.9 million tons. CO2 emissions from the cement industry to the atmosphere from 1996 to 2009 2 Cumulatively reaching 17 bill...

Claims

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Application Information

Patent Timeline
05 Dec 2012
Publication
CN101948255B
IPC
C04B7/28; C04B7/19
CPC
Y02P40/10
Inventors
余其俊; 张同生