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Dry-mixed ground mortar prepared from recycled aggregate and preparation method thereof

A technology of recycled aggregate and recycled fine aggregate, which is applied in the field of resource utilization of construction waste and production of building materials, can solve problems such as low strength, narrow application range, and many cracks, and achieve the effect of reducing porosity and improving compactness

Pending Publication Date: 2021-04-06
XIAMEN TIANRUN JINLONG BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of using recycled fine aggregate instead of natural sand to prepare dry-mixed ground mortar, so as to overcome the problems of existing recycled fine aggregate with many cracks, low strength and narrow application range

Method used

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  • Dry-mixed ground mortar prepared from recycled aggregate and preparation method thereof
  • Dry-mixed ground mortar prepared from recycled aggregate and preparation method thereof
  • Dry-mixed ground mortar prepared from recycled aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1 Preparation of dry-mixed ground mortar RDS-1

[0061] (1) Modified recycled fine aggregate

[0062] a. Repeated crushing, refining, cleaning and screening of construction waste concrete to obtain recycled fine aggregate with a particle size of 0.08-4.75 mm.

[0063] b. Weigh polyether polyol PEG400 and sodium silicate, mix well, add water and fully stir and dissolve to obtain modified slurry solution, wherein the mass ratio of PEG400, sodium silicate and water is 0.5:4.5: 100.

[0064] c. Under stirring, spray the modified slurry solution evenly on the surface of the recycled fine aggregate, so that the surface of the recycled fine aggregate is infiltrated by the modified slurry solution, and the modified slurry solution fully penetrates into the fine bone into the micro-cracks of the material, and then let it stand to dry to obtain the pretreated fine aggregate.

[0065] d. Dissolve the coupling agent mercaptopropyltrimethoxysilane in absolute ethanol to f...

Embodiment 2

[0069] Example 2 Preparation of dry-mixed ground mortar RDS-2

[0070] (1) Modified recycled fine aggregate

[0071] a. Repeated crushing, refining, cleaning and screening of waste masonry to obtain recycled fine aggregate with a particle size of 0.08-4.75 mm.

[0072] b. Weigh polyether polyol PPG1000 and sodium silicate, after mixing evenly, add water and fully stir and dissolve to obtain a modified slurry solution, wherein the mass ratio of PPG1000, sodium silicate and water is 1:3.5: 100.

[0073] c. Under stirring, spray the modified slurry solution evenly on the surface of the recycled fine aggregate, so that the surface of the recycled fine aggregate is infiltrated by the modified slurry solution, and the modified slurry solution fully penetrates into the fine bone into the micro-cracks of the material, and then let it stand to dry to obtain the pretreated fine aggregate.

[0074] d. Dissolve the coupling agent anilinomethyltrimethoxysilane in absolute ethanol to for...

Embodiment 3

[0078] Example 3 Preparation of dry-mixed ground mortar RDS-3

[0079] (1) Modified recycled fine aggregate

[0080] a. The waste mortar is crushed and refined repeatedly, cleaned and screened to obtain recycled fine aggregate with a particle size of 0.08-4.75mm.

[0081] b. Weigh polyether polyol PPG4000 and sodium silicate, mix evenly, add water and fully stir and dissolve to obtain a modified slurry solution, wherein the mass ratio of PPG4000, sodium silicate and water is 1.5:4: 100.

[0082] c. Under stirring, spray the modified slurry solution evenly on the surface of the recycled fine aggregate, so that the surface of the recycled fine aggregate is infiltrated by the modified slurry solution, and the modified slurry solution fully penetrates into the fine bone into the micro-cracks of the material, and then let it stand to dry to obtain the pretreated fine aggregate.

[0083] d, the coupling agent isopropyl tris (dioctyl pyrophosphate acyloxy) titanate is dissolved in...

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Abstract

The invention provides dry-mixed ground mortar prepared from recycled aggregate and a preparation method thereof, and the preparation method comprises the following steps: crushing, refining, cleaning and screening construction waste to obtain recycled fine aggregate; modifying the recycled fine aggregate with polyether polyol, sodium silicate and a coupling agent to obtain modified recycled fine aggregate; and then, weighing ordinary Portland cement, the modified recycled fine aggregate, II-grade fly ash, modified palygorskite, redispersible latex powder, starch ether, a water reducing agent and sodium gluconate in parts by weight, and uniformly mixing to prepare the dry-mixed ground mortar. By modifying the recycled fine aggregate, the 28d compressive strength of the obtained modified recycled fine aggregate dry-mixed ground mortar is improved by nearly 20%, the water retention rate is improved by about 17%, the setting time is improved by about 9%, the 2h consistency loss rate is reduced by about 32%, and the performance of the modified recycled fine aggregate dry-mixed ground mortar is equivalent to that of natural river sand dry-mixed ground mortar, and even better so that the resource utilization of the construction waste is realized.

Description

technical field [0001] The invention relates to the technical field of resource utilization of construction waste and production of building materials, in particular to a dry-mixed ground mortar prepared by using recycled aggregates and a preparation method thereof. Background technique [0002] The aggregate formed by crushing and grading construction waste (mainly composed of waste concrete and waste bricks, etc.) is called recycled concrete aggregate, or recycled aggregate for short. With the improvement of environmental awareness in modern society, the recycling of a large amount of waste concrete produced by the construction industry has attracted more and more attention. The development and application of recycled concrete aggregates, on the one hand, can use a large amount of waste concrete to reduce the consumption of natural aggregates in the construction industry; of sustainable development. [0003] However, compared with natural aggregates, recycled aggregates ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/60
CPCC04B28/04C04B2201/50C04B2111/60C04B2111/00017
Inventor 赖广兴尹键丽叶俊辉肖伟陈裕佳郭元强林添兴
Owner XIAMEN TIANRUN JINLONG BUILDING MATERIAL
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