A modified calcium aluminophosphate mineral

A technology of modifying calcium aluminophosphate and calcium aluminophosphate, which is applied in the field of cement materials, can solve problems such as low early strength, large volume shrinkage, and difficulty in meeting performance and construction requirements of Portland cement, achieving significant energy saving and consumption reduction , The effect of reducing the synthesis temperature

Inactive Publication Date: 2017-12-26
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is increasingly difficult for Portland cement to meet the performance and construction requirements of key projects or special projects. Its main disadvantages are low early strength and excessive volume shrinkage during hydration.

Method used

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  • A modified calcium aluminophosphate mineral
  • A modified calcium aluminophosphate mineral
  • A modified calcium aluminophosphate mineral

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A modified calcium aluminophosphate mineral, which is obtained by calcining raw materials, modifiers and mineralizers at a temperature of 1450 ° C, holding time for 3 hours, and rapidly cooling to room temperature;

[0029] The weight ratio of the raw meal, modifier and mineralizer is 100:7:5;

[0030] The mole percentage of each oxide in the raw material is: SiO 2 11.9, P 2 o 5 2.6, A1 2 o 3 46.1, CaO39.4;

[0031] The modifier is SrO;

[0032] MgO in the mineralizer: ZnO: Fe 2 o 3 The weight ratio is 1:1.5:1.

[0033] A modified calcium aluminophosphate mineral is prepared by the following steps:

[0034] 1) Grind various cement raw materials, modifiers and mineralizers separately, pass through a 200-mesh sieve, and the sieve residue is <5%;

[0035] 2) Mix the ground cement raw materials according to the mole percentage of each oxide in the raw meal, add modifiers and mineralizers according to the weight ratio, and add water according to the water-materi...

Embodiment 2

[0040] A modified calcium aluminophosphate mineral, which is obtained by calcining raw materials, modifiers and mineralizers at a temperature of 1500 ° C, holding time for 2 hours, and rapidly cooling to room temperature;

[0041] The weight ratio of the raw meal, modifier and mineralizer is 100:11:4;

[0042] The mole percentage of each oxide in the raw material is: SiO 2 10.2, P2 o 5 3.9, A1 2 o 3 42.6, CaO43.3;

[0043] The modifier is BaO;

[0044] MgO in the mineralizer: ZnO: Fe 2 o 3 The weight ratio is 1:1.2:1.5.

[0045] A kind of preparation method of modified calcium aluminophosphate mineral is the same as embodiment 1.

[0046] According to the mechanical property test, the compressive strength of clean paste is 30MPa for 1d, 65MPa for 3d, 95MPa for 7d, 120MPa for 28d and 130MPa for 90d.

Embodiment 3

[0048] A modified calcium aluminophosphate mineral, which is obtained by calcining raw materials, modifiers and mineralizers at a temperature of 1550 ° C, holding time for 1 hour, and rapidly cooling to room temperature;

[0049] The weight ratio of the raw meal, modifier and mineralizer is 100: 14: 3;

[0050] The mole percentage of each oxide in the raw material is: SiO 2 8.5, P 2 o 5 5.0, A1 2 o 3 39.3, CaO 47.2;

[0051] The modifier is BaO;

[0052] MgO in the mineralizer: ZnO: Fe 2 o 3 The weight ratio is 1:1:2.5.

[0053] A kind of preparation method of modified calcium aluminophosphate mineral is the same as embodiment 1.

[0054] According to the mechanical property test, the compressive strength of the clean pulp is 27MPa for 1d, 63MPa for 3d, 92MPa for 7d, 114MPa for 28d and 124MPa for 90d.

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Abstract

The invention discloses a modified calcium aluminophosphate mineral. The modified calcium aluminophosphate mineral is obtained in the mode that raw materials, a modifying agent and a mineralizing agent are calcined at the temperature of 1,450-1,550 DEG C, the heat preservation time ranges from 1 h to 3 h, and the temperature is rapidly reduced to the indoor temperature; the modifying agent is BaO or SrO. The modified calcium aluminophosphate mineral is high in early-stage hydration activity, the 7d hydration degree is 80% or above, and the 7d hydration degree is higher than that of non-modified calcium aluminophosphate mineral by 20% or above; the compressive strength is remarkably improved, the long-term strength is continuously increased, the resultant temperature of the modified calcium aluminophosphate mineral is reduced by about 30-70 DEG C, an energy saving effect and a cost reducing effect are remarkable, and the modified calcium aluminophosphate mineral is suitable for large-scale industrial application and popularization.

Description

technical field [0001] The invention belongs to the technical field of cement materials, in particular to a modified calcium aluminophosphate mineral. Background technique [0002] Portland cement is the most widely used cementitious material in the construction field in the world today. The cement clinker is mainly composed of C 3 S, C 2 S, C 3 A and C 4 AF four mineral composition. The cement hydration products are mainly C-S-H gel, calcium hydroxide and ettringite (AFt). However, it is increasingly difficult for Portland cement to meet the performance and construction requirements of key projects or special projects. Its main disadvantages are low early strength and excessive volume shrinkage during hydration. Therefore, the research, development and application of special cementitious materials that meet special engineering needs are of great significance. [0003] Aluminophosphate cement is a new type of special cement with my country's independent intellectual p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/02
CPCC04B12/025C04B7/32
Inventor 王守德杨帅芦令超赵丕琪宫晨琛
Owner UNIV OF JINAN
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