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

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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 strengthe

Method used

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

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Example Embodiment

[0020] Example 1

[0021] The recycled aggregate in this embodiment is derived from recycled concrete with a compressive strength of 30 MPa after being poured and cured for 28 days. The alkali-active aggregate used is Xiangjiang pebbles that have been verified as alkali-active aggregate through many experiments. They are crushed and sieved to the specified gradation according to ASTM C1567.

[0022] In step (3), according to the ASTM C1567 alkali-aggregate reaction expansion test method, the prepared recycled aggregate molded specimens are used. The particle size distribution of the recycled aggregates without treatment and vacuum suction of silica fume slurry is 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 percentages are 10%, 25%, 25%, 25% and 15% respectively. The following embodiments are the same.

[0023] The auxiliary cementing material made of recycled concrete aggregate after vacuum suction treatment with silica fume slurry can effectively inh...

Example Embodiment

[0029] Example 2

[0030] The recycled aggregate in this embodiment is derived from recycled concrete with a compressive strength of 30 MPa after being poured and cured for 28 days. The alkali-active aggregate used is Xiangjiang pebble that has been verified as alkali-active aggregate by many experiments, and it will be crushed and sieved to the specified gradation according to ASTM C1567.

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

[0032] (1) Collection of recycled aggregate: the recycled concrete with a compressive strength of 30MPa after being poured and cured for 28 days is crushed and screened 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 a water-solid mass ratio of 10:1 ...

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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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