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Preparation method of recycled aggregate for inhibiting alkali-aggregate reaction

A technology for recycled aggregates and aggregates, applied in the field of recycled aggregates, can solve the problems of primary aggregate damage, high requirements for solution concentration and soaking time, and large energy consumption, and achieves convenient installation and maintenance, shortened processing time, and reduced processing time. simple craftsmanship

Active Publication Date: 2019-03-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mechanical grinding and high temperature removal of the slurry attached to the surface of the recycled aggregate consume a lot of energy. The slurry attached to the recycled aggregate strengthened by water glass and polymer emulsion has high requirements on the solution concentration and soaking time, and the acid solution soaking treatment is easy to damage the primary bone. material damage

Method used

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  • Preparation method of recycled aggregate for inhibiting alkali-aggregate reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The recycled aggregate in this example comes from recycled concrete with a compressive strength of 30 MPa after pouring and curing for 28 days. The alkali-active aggregate used is Xiangjiang pebbles that have been verified as alkali-active aggregate by many experiments, and will be crushed and screened to the specified gradation according to the ASTM C1567 standard.

[0022] In step (3), according to the ASTM C1567 alkali-aggregate reaction expansion test method, the prepared recycled aggregate was used to form the test piece, and the particle size distribution of the recycled aggregate without treatment and vacuum inhaled silica fume slurry was 4.75- 2.36 mm, 2.36-1.18mm, 1.18-0.6mm, 0.6-0.3 mm and 0.3-0.15mm, the mass proportions are 10%, 25%, 25%, 25% and 15% respectively. The following examples are the same.

[0023] The auxiliary cementitious material that can effectively inhibit the alkali-aggregate reaction of concrete, which is made of recycled concrete aggrega...

Embodiment 2

[0030] The recycled aggregate in this example comes from recycled concrete with a compressive strength of 30 MPa after pouring and curing for 28 days. The alkali-active aggregate used is Xiangjiang pebbles that have been verified as alkali-active aggregate by many experiments, and will be crushed and screened to the specified gradation according to the ASTM C1567 standard.

[0031] The auxiliary cementitious material that can effectively inhibit the alkali-aggregate reaction of concrete, which is made of recycled concrete aggregate after vacuum suction treatment of silica fume slurry, is made according to the following steps:

[0032] (1) Collection of recycled aggregate: crush and sieve recycled concrete with a compressive strength of 30MPa after pouring and curing for 28 days to obtain recycled aggregate with a particle size of ≤4.75mm;

[0033] (2) Preparation of silica fume slurry: Dissolve silica fume in water according to the water-solid mass ratio of 10:1 to prepare silic...

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Abstract

The invention provides a preparation method of recycled aggregate for inhibiting an alkali-aggregate reaction. The preparation method is prepared from the following steps (1) the recycled aggregate iscollected, specifically, recycled concrete is crushed and sieved, and thus the recycled aggregate with the concrete required size is prepared; (2) silica fume slurry is prepared, specifically, according to the water-solid mass ratio of 5:1 to 15:1, silica fume is dissolved in water, and the silica fume slurry is prepared; (3) the silica fume slurry is subjected to vacuum suction to prepare the recycled aggregate, specifically, the collected and prepared recycled aggregate and the silica fume slurry are jointly placed into a vacuum container with the negative pressure for 6-18 h, and it is ensured that the silica fume slurry is fully sucked into recycled aggregate attached slurry body; and (4) the recycled aggregate with the sucked silica fume is dried, specifically, the recycled aggregatesubjected to vacuum sucking of the silica fume slurry is dried, and thus the recycled aggregate for effectively inhibiting alkali activity is obtained. According to the preparation method, a technology is simple, the cost is low, meanwhile, the recycled aggregate with the alkali activity can be efficiently utilized, and the environmental pressure is relieved.

Description

technical field [0001] The invention relates to a regenerated aggregate that has been strengthened with silica fume slurry that inhibits the alkali-aggregate reaction, in particular to a regeneration that inhibits the alkali-aggregate reaction obtained after the regenerated aggregate is treated with vacuum inhalation of silica fume slurry aggregate. Background technique [0002] Concrete is the most widely used building material in the world today. Improving the durability of concrete has important economic and environmental significance for the sustainable development and utilization of concrete materials. The alkali-aggregate reaction of concrete is one of the main problems that limit its durability. In essence, the alkali-aggregate reaction is the metastable reaction between the alkaline substances such as potassium hydroxide or sodium hydroxide precipitated in cement and the active aggregate. The reaction between the state of silica, this reaction will generate a silica...

Claims

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Application Information

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IPC IPC(8): C04B20/10
CPCC04B20/1066C04B20/026
Inventor 史才军彭子奕卢豹
Owner HUNAN UNIV
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