Magnesium phosphate cement recycled aggregate structure concrete and preparation method thereof

A technology of magnesium phosphate cement and recycled aggregate, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of low replacement rate of recycled aggregate, poor interface bonding performance, poor durability, etc. Achieve the effects of improving mechanical properties and durability, enhancing interfacial bonding performance, and stabilizing volume

Inactive Publication Date: 2014-10-01
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the problems of low strength, large shrinkage, poor interfacial bonding performance, poor durability and low replacement rate of recycled aggregates in the existing Portland cement recycled concrete, aiming at magnesium phosphate cement-based To solve the problems of fast setting of materials, large concentrated release of heat of hydration, and later strength shrinkage, a magnesium phosphate cement recycled aggregate structure concrete is provided, which has high early strength, small shrinkage, high volume stability, strong cohesion, The hardened body is neutral, good fire resistance and durability. It is suitable for structural concrete and high-performance recycled aggregate concrete. It can be used for civil construction under harsh conditions such as sulfate erosion, seawater erosion, high temperature environment and low temperature environment. engineering; the invention has simple preparation process, convenient use, energy saving and environmental protection

Method used

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  • Magnesium phosphate cement recycled aggregate structure concrete and preparation method thereof
  • Magnesium phosphate cement recycled aggregate structure concrete and preparation method thereof
  • Magnesium phosphate cement recycled aggregate structure concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The percentages by weight of the components of the magnesium phosphate cement recycled aggregate structure concrete in this example are: magnesium oxide 18.6%, potassium dihydrogen phosphate 5.4%, sodium dihydrogen phosphate 2.5%, composite retarder 2.4%, admixture pulverized coal Ash 2.8%, limestone powder 2.8%, recycled fine aggregate 13.3%, sand 13.3%, recycled coarse aggregate 15.1%, crushed stone 15.1%, water 7.9%; among them, the mass ratio of composite retarder is sodium tetraborate: 12 Disodium hydrogen phosphate hydrate: inorganic chloride salt = 2: 6: 3;

[0031] Mix magnesium oxide, phosphate, composite retarder, and admixture evenly according to the above ratio to obtain phosphate cement base material; wet the inner surface of the mixer, add regenerated coarse and fine aggregates and a part of water, and stir for 2-3 Minutes; After the recycled aggregate absorbs water, add the phosphate cement base material, natural aggregate and the rest of the water and st...

Embodiment 2

[0033] The percentage by weight of each component of the magnesium phosphate cement recycled aggregate structure concrete in this embodiment is: magnesia 18.5%, potassium dihydrogen phosphate 7.9%, composite retarder 2.4%, admixture fly ash 2.7%, limestone powder 2.7% %, recycled fine aggregate 21.3%, sand 5.3%, recycled coarse aggregate 24.2%, crushed stone 6.1%, water 8.9%; among them, the mass ratio of composite retarder is sodium tetraborate: sodium hydrogen phosphate dodecahydrate: inorganic Chlorine salt=2:6:3;

[0034] Mix magnesium oxide, phosphate, composite retarder, and admixture evenly according to the above ratio to obtain phosphate cement base material; wet the inner surface of the mixer, add regenerated coarse and fine aggregates and a part of water, and stir for 2-3 Minutes; After the recycled aggregate absorbs water, add the phosphate cement base material, natural aggregate and the rest of the water and stir evenly, and form the phosphate recycled aggregate st...

Embodiment 3

[0036] The percentage by weight of each component of the magnesium phosphate cement recycled aggregate structure concrete in this embodiment is: magnesia 18.5%, potassium dihydrogen phosphate 7.9%, composite retarder 2.4%, admixture fly ash 2.7%, limestone powder 2.7% %, recycled fine aggregate 26.6%, recycled coarse aggregate 30.2%, water 8.9%; among them, the mass ratio of composite retarder is sodium tetraborate: disodium hydrogen phosphate dodecahydrate: inorganic chloride = 2: 6: 3 ;

[0037] Mix magnesium oxide, phosphate, composite retarder, and admixture evenly according to the above ratio to obtain phosphate cement base material; wet the inner surface of the mixer, add regenerated coarse and fine aggregates and a part of water, and stir for 2-3 Minutes; After the recycled aggregate absorbs water, add the phosphate cement base material, natural aggregate and the rest of the water and stir evenly, and form the phosphate recycled aggregate structure concrete after harden...

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Abstract

The invention discloses magnesium phosphate cement recycled aggregate structure concrete and a preparation method thereof. The magnesium phosphate cement recycled aggregate structure concrete comprises the following components by weight percent: 12-30% of magnesium oxide, 8-20% of phosphate, 2-10% of composite retarder, 5-15% of admixture, 5-20% of recycled fine aggregate, 5-30% of recycled coarse aggregate, 0-10% of natural fine aggregate, 0-15% of natural coarse aggregate, and the balance being water. High early strength, small shrinkage rate, strong adhesive property and good corrosion resistance of the concrete are ensured by the magnesium phosphate cement; stable growth of the strength of the concrete is ensured by the admixture, and the durability and the volume stability are improved. The magnesium phosphate cement recycled aggregate structure concrete has the beneficial effects that the concrete material is applicable to the structure concrete and high-performance recycled aggregate concrete, can be applied to civil engineering in bad environments such as sulphate attack, marine corrosion, high-temperature environment and low-temperature environment, efficient utilization of the waste concrete is achieved, mining of natural gravel is reduced, the construction cost is reduced, and the targets of recycling wastes and protecting environment are achieved.

Description

technical field [0001] The invention belongs to the concrete category in the field of building materials, and relates to structural concrete prepared by using phosphate cement and recycled aggregate, high-performance recycled concrete and a preparation method thereof. Background technique [0002] Around my country's infrastructure construction and urbanization process, on the one hand, the concrete market demand is increasing year by year, resulting in a serious shortage of raw material resources; It is transported to the suburbs and processed by stacking or landfilling. Construction waste has caused serious harm to urban development and human settlements. Therefore, the recycling of waste concrete has great engineering value and environmental protection significance. [0003] After the waste concrete is crushed, decomposed, cleaned and graded, the particles of different sizes are mixed in a certain proportion and graded to form recycled concrete aggregate, referred to as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B18/16
CPCY02W30/91
Inventor 尹红宇荀勇杨建明孙帅支正东
Owner YANCHENG INST OF TECH
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