Modified phosphogypsum-based concrete prefabricated part and preparation method thereof

Abstract

The invention discloses a modified phosphogypsum-based concrete prefabricated part and a preparation method thereof. The preparation method sequentially comprises the following steps: S1, modificationof phosphogypsum; S2, preparation of concrete; and S3, preparation of the prefabricated part. According to the method, lime pretreatment is adopted, so that the influence of soluble phosphorus and fluorine on the practical performance of ardealite can be eliminated; the precast concrete component prepared from chemical fibers, additives, concrete raw materials, modified ardealite and the like isexcellent in performance and meets the quality requirements of fabricated building construction.

Description

Technical field

[0001] The invention relates to the technical field of concrete, in particular to a modified phosphogypsum-based concrete prefabricated component and a preparation method thereof. Background technique

[0002] Phosphogypsum is a by-product produced in the wet process of phosphoric acid production. About 4 to 5 tons of phosphogypsum are produced for every 1 ton of phosphoric acid produced. The comprehensive utilization rate of phosphogypsum in my country is about 40%. The output of phosphogypsum is large, and the comprehensive utilization cost is relatively high. A large amount of phosphogypsum is piled for a long time, which not only takes up land, but also poses greater environmental safety risks. The use of phosphogypsum in my country is mostly through four ways: building materials, chemicals, agriculture, and underground filling. From the perspective of industrial utilization, it is mainly concentrated in cement, cement clinker, wallboard, mortar, block, cement...

Examples

Embodiment 1

[0022] S1 Modification of phosphogypsum: Weigh 4.5 parts of quicklime and pre-hydrate with a small amount of water, add 90 parts of phosphogypsum that has been dried to a constant weight, mix well, air dry and sieve to obtain modified phosphogypsum;

[0023] S2 Preparation of concrete: weigh 90 parts of modified phosphogypsum, 350 parts of cement, 7 parts of fly ash, and 1.2 parts of glass fiber into the mixing device, stir at 450r / min for 10 minutes; add 534 parts of sand, stone 1046 parts, 125 parts of water, 4.5 parts of naphthalene water reducer, continue to stir for 20 minutes;

[0024] S3 Preparation of prefabricated components: pour the concrete mortar obtained in S2 into the mold of the required prefabricated components, cure and wait for forming.

Embodiment 2

[0028] S1 Modification of phosphogypsum: Weigh 6 parts of quicklime and use a small amount of water to pre-hydrate, add 100 parts of phosphogypsum that has been dried to a constant weight, mix well, air dry and sieve to obtain modified phosphogypsum;

[0029] S2 Concrete preparation: Weigh 100 parts of modified phosphogypsum, 375 parts of cement, 9.5 parts of fly ash, and 1.5 parts of glass fiber into the mixing device, stir at 450r / min for 12min; add 600 parts of sand and stone in sequence 1130 parts, 145 parts of water, 5.6 parts of melamine water reducer, continue to stir for 20 minutes;

[0030] S3 Preparation of prefabricated components: pour the concrete mortar obtained in S2 into the mold of the required prefabricated components, cure and wait for forming.

Embodiment 3

[0034] S1 Modification of phosphogypsum: Weigh 7 parts of quicklime and use a small amount of water to pre-hydrate, add 110 parts of phosphogypsum that has been dried to a constant weight, mix well and air dry and sieve to obtain modified phosphogypsum;

[0035] S2 Concrete preparation: Weigh 110 parts of modified phosphogypsum, 400 parts of cement, 11.5 parts of fly ash, and 1.7 parts of glass fiber into the mixing device, stir at 450r / min for 15min; add 647 parts of sand, stone 1250 parts, 175 parts of water, 7.2 parts of polycarboxylic acid water reducer, continue to stir for 25 minutes;

[0036] S3 Preparation of prefabricated components: pour the concrete mortar obtained in S2 into the mold of the required prefabricated components, cure and wait for forming.

Technical field

[0001] The invention relates to the technical field of concrete, in particular to a modified phosphogypsum-based concrete prefabricated component and a preparation method thereof. Background technique

[0002] Phosphogypsum is a by-product produced in the wet process of phosphoric acid production. About 4 to 5 tons of phosphogypsum are produced for every 1 ton of phosphoric acid produced. The comprehensive utilization rate of phosphogypsum in my country is about 40%. The output of phosphogypsum is large, and the comprehensive utilization cost is relatively high. A large amount of phosphogypsum is piled for a long time, which not only takes up land, but also poses greater environmental safety risks. The use of phosphogypsum in my country is mostly through four ways: building materials, chemicals, agriculture, and underground filling. From the perspective of industrial utilization, it is mainly concentrated in cement, cement clinker, wallboard, mortar, block, cement...

Examples

Embodiment 1

[0022] S1 Modification of phosphogypsum: Weigh 4.5 parts of quicklime and pre-hydrate with a small amount of water, add 90 parts of phosphogypsum that has been dried to a constant weight, mix well, air dry and sieve to obtain modified phosphogypsum;

[0023] S2 Preparation of concrete: weigh 90 parts of modified phosphogypsum, 350 parts of cement, 7 parts of fly ash, and 1.2 parts of glass fiber into the mixing device, stir at 450r / min for 10 minutes; add 534 parts of sand, stone 1046 parts, 125 parts of water, 4.5 parts of naphthalene water reducer, continue to stir for 20 minutes;

[0024] S3 Preparation of prefabricated components: pour the concrete mortar obtained in S2 into the mold of the required prefabricated components, cure and wait for forming.

Embodiment 2

[0028] S1 Modification of phosphogypsum: Weigh 6 parts of quicklime and use a small amount of water to pre-hydrate, add 100 parts of phosphogypsum that has been dried to a constant weight, mix well, air dry and sieve to obtain modified phosphogypsum;

[0029] S2 Concrete preparation: Weigh 100 parts of modified phosphogypsum, 375 parts of cement, 9.5 parts of fly ash, and 1.5 parts of glass fiber into the mixing device, stir at 450r / min for 12min; add 600 parts of sand and stone in sequence 1130 parts, 145 parts of water, 5.6 parts of melamine water reducer, continue to stir for 20 minutes;

[0030] S3 Preparation of prefabricated components: pour the concrete mortar obtained in S2 into the mold of the required prefabricated components, cure and wait for forming.

Embodiment 3

[0034] S1 Modification of phosphogypsum: Weigh 7 parts of quicklime and use a small amount of water to pre-hydrate, add 110 parts of phosphogypsum that has been dried to a constant weight, mix well and air dry and sieve to obtain modified phosphogypsum;

[0035] S2 Concrete preparation: Weigh 110 parts of modified phosphogypsum, 400 parts of cement, 11.5 parts of fly ash, and 1.7 parts of glass fiber into the mixing device, stir at 450r / min for 15min; add 647 parts of sand, stone 1250 parts, 175 parts of water, 7.2 parts of polycarboxylic acid water reducer, continue to stir for 25 minutes;

[0036] S3 Preparation of prefabricated components: pour the concrete mortar obtained in S2 into the mold of the required prefabricated components, cure and wait for forming.

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