Magnesium phosphate cement base fiber composite material and preparation method thereof

A technology of fiber composite materials and magnesium phosphate cement, which is applied in the field of construction composite materials, can solve the problems of inability to construct existing structures, long maintenance periods, and large dry shrinkage, and achieve excellent volume stability and good work performance , the effect of high early intensity

Active Publication Date: 2020-02-18
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low early strength of traditional ECC, large drying shrinkage, long maintenance period, inability to construct in cold winter, and weak bonding with existing structures have affected the scope of its practical application in engineering.

Method used

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  • Magnesium phosphate cement base fiber composite material and preparation method thereof
  • Magnesium phosphate cement base fiber composite material and preparation method thereof
  • Magnesium phosphate cement base fiber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The magnesium phosphate cement-based fiber composite material consists of 688.2kg of dead-burned magnesia, 585.0kg of potassium dihydrogen phosphate, 41.3kg of borax, 318.3kg of fly ash, 20.8kg of polyvinyl alcohol fiber, 248.3kg of water and 318.3 kg of quartz sand, borax, and potassium dihydrogen phosphate are composed of potassium dihydrogen phosphate particles with a particle size of 40 mesh and potassium dihydrogen phosphate particles with a particle size of 80 mesh, and potassium dihydrogen phosphate particles with a particle size of 40 mesh and potassium dihydrogen phosphate The mass ratio of hydrogen potassium particles is 1:1, and the specific surface area of ​​dead-burned magnesium oxide is 315.7m 2 / kg.

[0036] The selection of each mixture in the composite material is as follows:

[0037] The specific surface area of ​​dead-burned magnesia is 315.7m 2 / kg, the particle size distribution is shown in Table 1, and the composition is shown in Table 2.

[003...

Embodiment 2

[0062] Different from Example 1, the magnesium phosphate cement-based fiber composite material is composed of 686.9kg of dead-burned magnesium oxide, 583.9kg of potassium dihydrogen phosphate, 41.2kg of borax, 317.7kg of fly ash, and 24.4kg of polyethylene Alcohol fiber, 247.8kg of water and 317.7kg of quartz sand.

Embodiment 3

[0064] Different from Example 1, the magnesium phosphate cement-based fiber composite material consists of 823.4kg of dead-burned magnesium oxide, 699.8kg of potassium dihydrogen phosphate, 49.4kg of borax, 380.8kg of fly ash, and 20.8kg of polyvinyl alcohol Fiber, 247.7kg of water and 0kg of quartz sand.

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Abstract

The invention relates to a magnesium phosphate cement base fiber composite material and a preparation method thereof. The magnesium phosphate cement base fiber composite material is composed of following components in parts by weight: 516.2 to 823.4 parts of heavily burnt magnesia, 438.7 to 699.8 parts of potassium dihydrogen phosphate, 31.0 to 49.4 parts of borax, 159.2 to 636.6 parts of fly ash,15.6 to 26.0 parts of polyethylene alcohol fiber, 248.3 to 325.0 parts of water, and 0 to 546.9 parts of quartz sand. The magnesium phosphate cement base fiber composite material has the characteristics of high ductility, strain-hardening, and multi-crack stable cracking damage, moreover, the work performance is good, the early strength is high, and the volume stability is excellent. In the priorart, a conventional cement base engineering material has the shortages of large shrinkage, long maintenance period, and low early strength, at a low temperature, the engineering material cannot be cured or hardened, and the binding force between the engineering material and a structure is weak, and the provided composite material solves the problems mentioned above, and has an important application value.

Description

technical field [0001] The invention relates to a composite material for construction, in particular to a magnesium phosphate cement-based fiber composite material and a preparation method thereof. Background technique [0002] ECC (Engineered Cementitious Composites, referred to as ECC) is a random fiber reinforced cement-based composite material with high ductility, also known as bendable concrete or ultra-high toughness cement-based composite material. It has the characteristics of multi-seam steady-state cracking, and it can be used as a repair material to improve the bearing capacity of existing structures, or as an external protective layer material to prevent various forms of concrete cracking, which can improve the durability of the overall structure and deal with harsh environmental factors and strict conditions. durability requirements. However, the low early strength of traditional ECC, large drying shrinkage, long maintenance period, inability to construct in co...

Claims

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Application Information

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IPC IPC(8): C04B28/34
CPCC04B28/34C04B22/0013C04B18/08C04B16/0641C04B14/06Y02W30/91Y02A30/30
Inventor 冯虎刘光辉赵祥宇李璐璐沈世豪杜冠宇程站起高丹盈
Owner ZHENGZHOU UNIV
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