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Modified phosphogypsum-based concrete prefabricated part and preparation method thereof

A prefabricated component, phosphogypsum technology, applied in the field of concrete, can solve the problems of not using large-scale production, complex process, long aging time, etc., and achieve the improvement of fluidity and workability, improvement of compressive strength, and excellent strength. Effect

Pending Publication Date: 2020-07-14
南通长城建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with unmodified concrete, the strength and expansion properties of the concrete prepared by modification of phosphogypsum are improved to a certain extent, but the aging time required for the whole modification process is longer, which is not conducive to industrial production; and the early strength of the prepared material is not high
The patent (CN 105777022 B) discloses a phosphogypsum concrete extruded partition wall. The modification method used is to use a composite activator for heat transfer and activating catalytic treatment. The whole process is complicated and time-consuming, and does not use large-scale production

Method used

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  • Modified phosphogypsum-based concrete prefabricated part and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B11/26
CPCC04B11/26C04B28/143C04B2201/50C04B7/00C04B18/08C04B14/42C04B14/02C04B14/06C04B24/226
Inventor 龚培友施宁
Owner 南通长城建筑科技有限公司
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