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Method for solidifying heavy metal and soil polyalcohol composite cement special for the same

The technology of soil polymer and composite cement is applied in the field of preparation of soil polymer composite cement solidified by heavy metals, which can solve the problems of difficult solidification process, swelling and fluffy solidified body, and achieve the effect of good solidification effect.

Inactive Publication Date: 2008-09-24
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many problems in the application process of cement curing technology, such as: the formed precipitation products will become soluble in low pH environment; the existence of organic matter will interfere with the cement hydration process, making the curing process difficult; soluble salts The presence of species reduces the strength of the solidified body, resulting in fluffy and damaged; the sulfate in the waste reacts with the cement hydration product, causing the solidified body to expand and rupture; the solidified body is easily corroded by acidic media

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Ordinary Portland cement 60.0%

[0020] Silicon fume 15.0%

[0021] Fly Ash 16.0%

[0022] Ground slag 3.0%

[0023] Metakaolin 5.0%

[0024] Base activator 2.5%

[0025] Take 440 parts of the above mixture, add 665 parts of medium sand, add 998 parts of stone and 198 parts of water, stir evenly, and make soil polymer composite cement concrete. The 28-day compressive strength of soil polymer composite cement concrete is 56.8MPa, the axial compressive strength is 35.8MPa, the splitting tensile strength is 2.44MPa, and the static compressive elastic modulus is 3.23×10 4 MPa, the tensile strength is 3.45MPa, and the tensile modulus is 3.01×10 4 MPa, the ultimate tensile value is 122.22×10 -6 . The soil-polymer composite cement concrete has similar mechanical behavior to ordinary concrete with a water-binder ratio of 0.45.

Embodiment 2

[0027] Take 440 parts of the mixture of Example 1, add 665 parts of medium sand, add 998 parts of stone and 198 parts of water, stir evenly, and make soil polymer composite cement concrete. The soil polymer composite cement concrete specimens are cured at room temperature of 20°C, and the surface is covered with plastic wrap to prevent water from evaporating. After the formwork is removed, they are placed in a drying shrinkage chamber to test the initial length. The temperature of the drying shrinkage chamber is controlled at 20°C±2°C , the humidity is controlled at 60% ± 5%. After the initial length test is completed, continue to place it in the drying shrinkage room, and test the length at the specified age, and calculate the shrinkage rate. The dry shrinkage rate of the soil polymer composite cement concrete was measured to be 284.8×10 in 60 days -6 , is 81.5% of ordinary concrete with a water-binder ratio of 0.45, and the drying shrinkage of other ages is significantly lo...

Embodiment 3

[0029] Ordinary Portland cement 60.0%

[0030] Silicon fume 15.0%

[0031] Fly Ash 16.0%

[0032] Ground slag 3.0%

[0033] Metakaolin 5.0%

[0034] Base activator 2.5%

[0035] Take 440 parts of the above mixture, add 665 parts of medium sand, add 998 parts of stone and 198 parts of water, stir evenly, and make soil polymer composite cement concrete. The effective diffusion coefficient of chloride ions in this concrete is 1.00×10 -12 m 2 / s, which is only 17.0% of ordinary concrete with a water-binder ratio of 0.45, so this concrete has better resistance to chloride ion erosion than ordinary concrete.

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Abstract

The invention discloses a soil polymer composite cement, which is prepared when the following weight percentages of materials react after being mixed: common Portland cement accounts for 40.0 to 77.0 percent; silicon powder accounts for 5.0-20.0 percent; pulverized fuel ash accounts for 10.0-30.0 percent; milled slag accounts for 0-10 percent, metakaolin accounts for 5.0-10.0 percent, alkali excitant accounts for 1.0-5.0 percent. After being fully mixed with water, the soil polymer composite cement prepared by the invention can harden into solid at room temperature. The soil polymer composite cement prepared by the invention has excellent sulfate corrosion resistance and chloridion corrosion resistance, has fine solidification effect on the added copper, lead, nickel, zinc, cadmium, and other heavy metals; the solidification rates are all more than 99.9 percent.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a method for preparing soil polymer composite cement used for heavy metal solidification. Background technique [0002] Soil polymer is one of the most active research materials in the world in recent years. It is a new type of inorganic new material integrating the advantages of early strength, environmental protection and durability. field has been widely applied. The soil polymer does not have the hydration reaction like ordinary cement. It is a raw material containing silicon and aluminum. Under the action of OH- in a strong alkali environment, the bridge oxygen structure is broken, and free-moving silicon and aluminum monomers are rapidly dissolved. These monomers Local orientation, local reconstruction, polycondensation reaction occurs, three-stage solidification process of dissolution-reconstruction-polycondensation is completed, and the entire system hardens to ...

Claims

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Application Information

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IPC IPC(8): A62D3/30B09C1/00A62D101/43C04B22/08C04B22/06C04B18/08
CPCY02W30/91
Inventor 李克亮黄国泓陈健王毅温金保邢有红刘兴荣陈国新王冬唐修生蔡明祝烨然
Owner NANJING RUIDI HIGH TECH
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