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Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof

A technology of pre-products and cement, which is applied in the field of preparation of self-pulverizing low-calcium cement and its pre-products. It can solve the problems of reduced cement performance, unsuitability for industrial applications, and low growth rate, and achieves reduced cement power consumption and short production cycles. , the effect of slowly increasing intensity

Active Publication Date: 2016-02-24
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN102491655A discloses the preparation method of self-powdering clinker slag portland cement, but this cement is hydraulic, slag is the main cementitious material, and self-powdering clinker is only an external material; The content of clinker in cement is used to prepare the method of low-carbon cement; Patent CN102249576A has announced a kind of low energy consumption, low emission cement and its preparation method and application, and the main minerals of this cement are dicalcium silicate, calcium sulfoaluminate and iron Tetracalcium aluminate; the above method, although to a certain extent reduces the CO produced by cement 2 Emissions, but the consequence is that the performance of cement is greatly reduced, manifested in: low early strength, low growth rate in the later period, cracking, poor durability, short life, not suitable for industrial applications, and not suitable for cementitious materials for prefabricated building materials

Method used

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  • Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof
  • Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof
  • Autogenously-pulverizable low calcium cement, and making method of prefabricated products thereof

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Experimental program
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Effect test

Embodiment 1

[0023] A kind of preparation method of self-pulverizing low-calcium cement pre-product is as follows:

[0024] Step 1. Mix 70 parts of limestone, 20 parts of sandstone and 10 parts of iron ore. The chemical composition of the raw materials is shown in Table 1. After crushing and grinding, they are calcined in a rotary kiln at a calcining temperature of 1250 ° C and cooled naturally, which is obtained from Powdered low-calcium cement clinker, the CaO content in the cement is 52%, and the fineness of the raw material after grinding is controlled below 10%;

[0025] Step 2, 90 parts of the self-powdering low-calcium cement clinker prepared in step 1 was added to 10 parts of tap water, and after stirring evenly, the test block of 40×40×40 was obtained by extrusion molding on the molding equipment;

[0026] Step 3. Put the test block prepared in step 2 into the curing kettle, and feed high concentration CO 2 Industrial waste gas, control the pressure in the curing kettle at 0.5MPa...

Embodiment 2

[0030] A kind of preparation method of self-pulverizing low-calcium cement pre-product is as follows:

[0031] Step 1. Mix 70 parts of limestone, 20 parts of sandstone and 10 parts of iron ore. The chemical composition of the raw materials is shown in Table 2. After being crushed and ground, they are calcined in a rotary kiln at a calcining temperature of 1250° C. and cooled naturally, which is obtained from Powdered low-calcium cement clinker, the CaO content in the cement is 52%, and the fineness of the raw material after grinding is controlled below 10%;

[0032] Step 2. Add 90 parts of the self-powdering low-calcium cement clinker prepared in step 1 to 10 parts of tap water, stir evenly, and then extrude on a molding device to obtain a 100×100×10 sheet;

[0033] Step 3. Put the thin plate prepared in step 2 into the curing kettle, and pass high concentration CO 2 Industrial waste gas, control the pressure in the curing kettle at 0.5MPa, room temperature, curing for 5 hour...

Embodiment 3

[0038] A kind of preparation method of self-pulverizing low-calcium cement pre-product is as follows:

[0039] Step 1. Mix 60 parts of limestone, 35 parts of sandstone and 5 parts of iron ore. The chemical composition of the raw materials is shown in Table 3. After being crushed and ground, they are calcined in a rotary kiln at a calcining temperature of 1200° C. and cooled naturally, which is obtained from Powdered low-calcium cement clinker, the CaO content in the cement is 42%, and the fineness of the raw material after grinding is controlled below 10%;

[0040] Step 2, 90 parts of the self-powdering low-calcium cement clinker prepared in step 1 was added to 10 parts of tap water, and after stirring evenly, the test block of 40×40×40 was obtained by extrusion molding on the molding equipment;

[0041] Step 3. Put the test block prepared in step 2 into the curing kettle, and feed high concentration CO 2 Industrial waste gas, control the pressure in the curing kettle at 0.6M...

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Abstract

The invention relates to an autogenously-pulverizable low calcium cement, and a making method of a prefabricated product thereof. The autogenously-pulverizable low calcium cement is made from limestone, sandstone and iron ore, the CaO content of the prepared autogenously-pulverizable low calcium cement is 40-60%, and the main mineral phase of the autogenously-pulverizable low calcium cement is CS, C3S2, gamma-C2S and a liquid phase. The activity of the cement is excited by using high-concentration CO2 gas in a short period (8h) to make the prefabricated products of the autogenously-pulverizable low calcium cement, and the prefabricated products can be a sheet, a building block, a brick and a tile, and can also be solid or hollow or porous high-strength prefabricated products. The problems of long curing period, high energy consumption and shrinkage cracking of ordinary Portland cement prefabricated products are solved in the invention; and additionally, the autogenously-pulverizable low calcium cement has the advantages of low energy consumption in the baking process, small CO2 discharge amount, high early strength, and slow increase of the later strength, and the product of the autogenously-pulverizable low calcium cement has the advantages of excellent physical and mechanical performances, good durability, fire and corrosion resistance, good decorativeness and processability, environmental protection, energy saving and emission reduction, and very good social, economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of self-powdering low-calcium cement and a prefabricated product thereof. Background technique [0002] In recent years, prefabricated houses have attracted more and more attention. Prefabricated houses use industrialized production methods to build houses. Some or all of the components of the house are prefabricated in the factory, and then transported to the construction site. The houses assembled by reliable connection methods are called industrialized houses or industrialized houses in Europe, America and Japan. The production of prefabricated components inevitably requires the use of Portland cement, but there are still some shortcomings in the currently used Portland cement, mainly as follows: low early strength (20-30MPa), long maintenance period, high energy consumption for steam curing, Easy to crack, etc. In addition, the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/02C04B28/04
CPCC04B7/02C04B28/04C04B40/0231
Inventor 管学茂刘松辉张海波冯春花勾密峰李海燕邱满张建成
Owner HENAN POLYTECHNIC UNIV
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