Alkali-activated carbonate composite cementing material and preparation method thereof

A composite cementitious material, alkali-activated technology, applied in cement production, etc., can solve problems such as complex process, long construction period, unstudied setting time and shrinkage performance, and achieve the effect of highlighting technological progress and simple operation process

Inactive Publication Date: 2012-07-25
63653 FORCES PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Literature search disclosure: ① Yip et al. published an article "Carbonate mineral addition to metakaolin-based geopolymers" in the journal "Cement & Concrete Composites" in 2008, 30(10):979-985, indicating that the addition of metakaolin-based geopolymers About 20% of calcite or dolomite can increase its compressive strength, but it will lead to a large shrinkage of the test body in the initial 90d; ② Zhu Qiang et al. The article "Mechanical Properties and Microstructure of Dolomite Fly Ash-Based Geopolymers" was published in the Journal of Salt Science, showing that the addition of 10-25% dolomite powder helps to improve the early and late stages of geopolymers. Compressive strength, dolomite participates in the reac

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Operation method: take 20 parts by weight of slag, 10 parts of fly ash, 20 parts of metakaolin, and 50 parts of dolomite powder (the mass fraction of CaO is 30.73%, and the mass fraction of MgO is 21.31%), and place them in the mixer in sequence , at normal temperature and pressure, stirred at a speed of 120 rpm for 15 minutes to obtain a solid powder; slowly added to 80 parts at a stirring speed of 90 rpm, with a modulus of 1.2, silicon dioxide and oxide The sum of the sodium mass fractions is 40% of the modified water glass solution, and the stirring is continued for 5 minutes to obtain the alkali-excited composite gelled material; after passing the standards GB / T 8077-2000, GB / T 1346-2001 and GB / T 17671- The test in 1999 has reached the national standard

Embodiment 2

[0017] Operation method: Take 20 parts of slag, 15 parts of fly ash, 30 parts of metakaolin, and 35 parts of limestone powder (the mass fraction of CaO is 54.03%) in parts by weight, and place them in the mixer in sequence. Stir at a speed of 100 rev / min for 7 minutes, then the obtained solid powder; slowly add to 70 parts of a modulus of 1.4, the sum of the mass fractions of silicon dioxide and sodium oxide is 30 at a stirring speed of 90 rev / min % of the modified water glass solution, continue to stir for 4 minutes, and the obtained alkali-activated composite gelled material; after the tests of the standards GB / T 8077-2000, GB / T 1346-2001 and GB / T 17671-1999, all reach the national standard standard.

Embodiment 3

[0019] Operation method: Take 25 parts of slag, 20 parts of fly ash, 10 parts of metakaolin, and 45 parts of dolomite powder (the mass fraction of CaO is 30.35%, and the mass fraction of MgO is 21.61%) in the mixer in order in parts by weight. At normal temperature and pressure, stir at a speed of 60-120 rpm for 10 minutes, then slowly add the obtained solid powder to 90 parts of a modulus of 1.8, silicon dioxide and The sum of the mass fractions of sodium oxide is 40% of the modified water glass solution, and the stirring is continued for 3 minutes to obtain the alkali-activated composite gel material; after passing the standards GB / T 8077-2000, GB / T 1346-2001 and GB / T 17671 -The test in 1999 has reached the national standard.

[0020] The industrial sodium silicate used in the above test is three types of sodium silicate in line with the national standard GB / T 4209-2008, liquid-3, liquid-4 and solid-3;

[0021] The selected slag is S95 or S105 granulated blast furnace slag ...

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Abstract

The invention provides an alkali-activated carbonate composite cementing material and a preparation method thereof. Modified sodium silicate solution and solid powder material are weighed at the mass ratio of (0.6-1.0):1; in the preparation process, under the stirring of 60-120 turns/min, the solid powder material is slowly added into the modified sodium silicate solution to continuously stir for 3-5 minutes to obtain the alkali-activated composite cementing material, wherein the modified sodium silicate solution is prepared in the following steps: sodium hydroxide is dissolved in liquid sodium silicate, or sodium hydroxide and solid sodium silicate are dissolved in water together and the obtained product is continuously stirred until solution is transparent; the modulus of the obtained sodium silicate solution, i.e. the mass ratio of silica and sodium oxide is 1.2-2.0, and the mass concentration sum of the silica and the sodium oxide is 25-45%; the solid powder material is prepared from the following components in parts by weight: 15-30 parts of slag, 5-20 parts of coal ash, 10-30 parts of metakaolin and 20-70 parts of dolomite dust or limestone powder; and the above raw materials are successively arranged in a blender mixer and are stirred at normal pressure and temperature at 60-120 turns/ min for 5-15 minutes to obtain the finished product.

Description

technical field [0001] The invention relates to the field of gelling materials, in particular to an alkali-activated composite gelling material and a preparation method thereof. Background technique [0002] Alkali-activated gelling materials are a kind of gelling materials formed by the reaction of volcanic ash active or latent hydraulic raw materials and alkaline activators. Its invention expands the scope of hydraulic mineral gelling materials. The former Soviet Union carried out a lot of research in this area and developed alkali slag cement. Studies have found that compared with general-purpose Portland cement, alkali slag cement has the advantages of small water demand, low heat of hydration, high strength, and good durability, but it also has fatal shortcomings such as fast setting speed and large hardening shrinkage. its wide application. In the 1970s, French Davidovits developed a new type of alkali-activated metakaolin cementitious material with metakaolin as th...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/147
CPCY02P40/10
Inventor 袁晓宁杨萍赵维霞蔡溪南毛仙鹤赵康陈旻秦志桂
Owner 63653 FORCES PLA
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