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
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[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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