Surface modifier for regenerated coarse aggregate

A technology of surface modifier and recycled coarse aggregate, which is applied in the field of building materials, can solve the problems of high concrete strength and durability, limited strengthening capacity, and high processing price, so as to improve the surface strength of aggregates and process quickly and conveniently , the effect of improving its own performance

Inactive Publication Date: 2006-10-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, analyzing previous research results, on the one hand, the processing method is more complicated, and at the same time, when the materials used are inorganic materials, most of them have a long processing cycle; when they are organic materials, not only the processing price is high, but also their strengthening ability is limited.
Therefore, it cannot meet the characteristics of high strength and durability of concrete

Method used

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  • Surface modifier for regenerated coarse aggregate

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Experimental program
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Effect test

Embodiment 1

[0023] 1. Modify sodium silicate: grind sodium silicate solid and sodium hydroxide solid at a mass percentage of 3:1 to make the modulus M 0 Between 1.5-2.0, NaO and SiO in the system 2 The mass percentages of the modified sodium silicate are greater than 4.5% and 9.5% respectively, and its parameters are controlled to meet the requirements of the indicators in Table 1 to obtain modified sodium silicate.

[0024] model

[0025] 2. Preparation of raw materials: slag fine powder is ordinary water-quenched slag; coagulation regulator is sodium fluorosilicate; solid filler is silica fume.

[0026] 3. According to the percentage by weight of each raw material: 84% of slag fine powder, 6% of modified sodium silicate, 1% of coagulation regulator, 9% of solid filler, select raw materials; mix and grind various raw materials to a specific surface area of ​​1320m 2 / kg to obtain a surface modifier for recycled coarse aggregate. The structure of the recycled coarse aggregate...

Embodiment 2

[0034] 1. Preparation of raw materials: modify sodium silicate: grind sodium silicate solid and sodium hydroxide solid at a mass percentage of 3:1 to make the modulus M 0 Between 1.5-2.0, NaO and SiO in the system 2 The mass percentages are greater than 4.5% and 9.5%, respectively, to obtain modified sodium silicate. The coagulation regulator is sodium fluorosilicate; the solid filler is silica fume.

[0035] 2. According to the weight percentage of each raw material: slag fine powder 80, modified sodium silicate 2, coagulation regulator 0.1, solid filler 17.9, select raw materials; mix and grind various raw materials until the specific surface area is 1000m 2 / kg to obtain a surface modifier for recycled coarse aggregate.

Embodiment 3

[0037]1. Preparation of raw materials: modify sodium silicate: grind sodium silicate solid and sodium hydroxide solid at a mass percentage of 3:1 to make the modulus M 0 Between 1.5-2.0, NaO and SiO in the system 2 The mass percentages are greater than 4.5% and 9.5%, respectively, to obtain modified sodium silicate. The coagulation regulator is sodium fluorosilicate; the solid filler is silica fume.

[0038] 2. According to the weight percentage of each raw material: slag fine powder 90, modified sodium silicate 8, coagulation regulator 1, solid filler 1, select raw materials; mix and grind various raw materials until the specific surface area is 1500m 2 / kg to obtain a surface modifier for recycled coarse aggregate.

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Abstract

The invention relates to a surface active agent for surface reinforcement of reclaimed coarse aggregate, which is prepared mainly from the raw materials of (by weight percent) slag fines 80-90%, modified sodium silicate 2-8%, agglomerating agent 0.1-1% and solid packing material 1.0-17.9%.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a modifier for surface strengthening of recycled coarse aggregate. Background technique [0002] Recycled coarse aggregate is the aggregate whose particle size is larger than 5mm obtained after crushing and sorting of construction waste. Compared with natural aggregates, recycled aggregates have rough surfaces, more edges and corners, and contain about 30% hardened cement mortar. In addition, during the disintegration and crushing of concrete blocks (whether mechanical or manual) A certain amount of damage will cause a large number of micro-cracks inside the recycled aggregate. These factors will increase the water absorption and water loss rate of the recycled aggregate, which is unfavorable for the preparation of recycled concrete. Therefore, in order to improve the performance of recycled concrete, it is necessary to take certain measures to pretreat the recycled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02
Inventor 马保国蹇守卫郝先成张琴
Owner WUHAN UNIV OF TECH
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