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Q/P phase cement clinker containing phosphorus calcium aluminate

A technology of cement clinker and calcium aluminum phosphate, applied in cement production, etc., can solve problems such as slow hydration and inability to meet the growth of cement strength

Active Publication Date: 2021-08-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but since C 2 The hydration of S is slow and cannot meet the demand for cement strength growth in the later stage. Therefore, it is of great significance to develop a Q-phase cement clinker with excellent performance.

Method used

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  • Q/P phase cement clinker containing phosphorus calcium aluminate
  • Q/P phase cement clinker containing phosphorus calcium aluminate
  • Q/P phase cement clinker containing phosphorus calcium aluminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Calculate and weigh 200g of raw materials according to the mineral ratio, the particle size is to pass through a 200-mesh standard sieve, and the sieve residue is 6-10%. Then use a ball mill to stir, dry, and sample preparation. The sample is a circular cake-shaped sample with a diameter of 40 mm, which is dried in a low-temperature oven, then placed in a high-temperature calciner for firing at 1350 ° C, and kept for 2 hours.

[0026] The weight percentage of clinker mineral is:

[0027] Q / P phase: 40%

[0028] Calcium aluminophosphate: 35%

[0029] Calcium aluminate: 10%

[0030] Dicalcium silicate: 10%

[0031] Tetracalcium aluminoferrite: 5%.

Embodiment 2

[0033] Calculate and weigh 200g of raw materials according to the mineral ratio, the particle size is to pass through a 200-mesh standard sieve, and the sieve residue is 6-10%. Then use a ball mill to stir, dry, and sample preparation. The sample is a circular cake-shaped sample with a diameter of 40 mm, which is dried in a low-temperature oven, then placed in a high-temperature calciner for firing at 1350 ° C, and kept for 2 hours.

[0034] The weight percentage of clinker mineral is:

[0035] Q / P phase: 45%

[0036] Calcium aluminophosphate: 40%

[0037] Calcium aluminate: 10%

[0038] Dicalcium silicate: 3%

[0039] Tetracalcium aluminoferrite: 2%.

Embodiment 3

[0041] Calculate and weigh 200g of raw materials according to the mineral ratio, the particle size is to pass through a 200-mesh standard sieve, and the sieve residue is 6-10%. Then use a ball mill to stir, dry, and sample preparation. The sample is a circular cake-shaped sample with a diameter of 40 mm, which is dried in a low-temperature oven, then placed in a high-temperature calciner for firing at 1350 ° C, and kept for 2 hours.

[0042] The weight percentage of clinker mineral is:

[0043]Q / P phase: 50%

[0044] Calcium aluminophosphate: 35%

[0045] Calcium aluminate: 8%

[0046] Dicalcium silicate: 5%

[0047] Tetracalcium aluminoferrite: 2%.

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Abstract

The invention particularly relates to a Q / P phase cement clinker containing phosphorus calcium aluminate, and belongs to the technical field of building materials. The cement clinker is composed of five mineral phases, namely a Q / P phase, calcium phosphoaluminate (C8A6P), calcium aluminate (CA), dicalcium silicate (C2S) and tetracalcium aluminoferrite (C4AF). According to the invention, by doping a certain amount of P2O5 into the system, not only is the generation of a Q / P phase promoted, but also the introduction of an iron phase reduces the cement firing temperature and promotes the generation of calcium phosphoaluminate, so that part of calcium aluminate is converted into calcium phosphoaluminate to replace part of C2S to ensure the later strength increase. The prepared cement clinker has the advantages of low firing temperature, good hydration performance, high early strength and no shrinkage of later strength.

Description

technical field [0001] The invention specifically relates to a Q / P phase cement clinker containing calcium aluminum phosphate, which belongs to the technical field of building materials. Background technique [0002] T∙W∙ Parker discovered pleochroite when studying high-alumina cement. Later, this kind of mineral was called P phase, and its molecular composition was 6CaO∙4Al 2 o 3 ∙FeO∙SiO 2 , abbreviated as C 6 A 4 F''S, and concluded that the P phase may exist in the following system: CA-P phase-C 12 A 7 -C 2 S; CA-P phase-C 2 S-C 2 AS; CA-P phase-C 2 AS-FeO. If FeO is replaced by MgO in the system, the P phase will be transformed into Q phase. [0003] The Q-phase mineral is a stable phase formed by the CaO-MgO-Al2O3-SiO2 quaternary system at 1260°C-1300°C, and its composition was originally considered to be C 6 A 4 MS, namely 6CaO∙4Al 2 o 3 ∙MgO∙SiO 2 , and later Kapralik I and Hanic F et al. had new research on the composition and structure of the Q pha...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36C04B7/38C04B7/43
CPCC04B7/32C04B7/36C04B7/38C04B7/43Y02P40/121
Inventor 王守德袁俊刚颜景华黄永波程新
Owner UNIV OF JINAN
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