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Retarder for recycled aggregate mortar, and preparation method of retarder

A recycled aggregate and retarder technology, applied in the field of building materials, can solve the problems of large loss of mortar mixture consistency, poor fluidity of mortar mixture, and short operating time of mortar, so as to increase the setting time, Enhance the retarding effect and prolong the effect of setting time

Inactive Publication Date: 2020-06-26
深圳市三绿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, because the surface of the recycled aggregate is rough, sharp and angular, and there is an interlocking effect between the particles, the fluidity of the mortar mixture is deteriorated. Secondly, the water absorption is large, and the absorbed water is lost quickly. The regenerated bone with the angular characteristics of the aggregate The material makes the consistency of the mortar mixture lose a lot, the mortar quickly becomes dry and hard, the setting time is greatly shortened, and the operating time of the mortar is shorter

Method used

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  • Retarder for recycled aggregate mortar, and preparation method of retarder
  • Retarder for recycled aggregate mortar, and preparation method of retarder
  • Retarder for recycled aggregate mortar, and preparation method of retarder

Examples

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preparation example 1

[0030] Preparation Example 1: According to the ratio of raw materials in Table 1, (1) 10kg of corn stalks were pulverized into 1mm fiber material, the fiber material was placed in 5kg sodium hydroxide solution, kept at 30°C for 50min, and 5kg of ethanol and 5kg of chloroacetic acid, heated to 60°C in a water bath, and dried to a moisture content of 10%; (2) Heat the fiber material, 10kg of acrylic acid, 0.01kg of N,N-methylenebisacrylamide and 0.12kg of ammonium persulfate in a water bath to Stir at 70°C for 2 hours, dry, and crush to 0.4 mm to obtain straw colloid; (3) Mix 10 kg of phosphogypsum with straw colloid to obtain modified phosphogypsum, the particle size of which is 10 μm.

[0031]The raw material ratio of modified phosphogypsum in the preparation example 1-3 of table 1

[0032]

preparation example 2

[0033] Preparation example 2: according to the raw material proportioning in table 1, (1) 15kg corn stalks are pulverized into the fiber material of 8mm, fiber material is placed in 8kg sodium hydroxide solution, at 35 ℃ for 45min, add 8kg ethanol and 8kg of chloroacetic acid was heated to 65°C in a water bath and dried to a moisture content of 13%; (2) the fiber material, 13kg of acrylic acid, 0.03kg of N,N-methylenebisacrylamide and 0.14kg of ammonium persulfate were heated in a water bath to Stir at 75°C for 1.5h, dry, and crush to 0.5mm to obtain straw colloid; (3) Mix 15kg of phosphogypsum with straw colloid to obtain modified phosphogypsum with a particle size of 15μm.

preparation example 3

[0034] Preparation example 3: according to the raw material proportioning in table 1, (1) 20kg corn stalks are pulverized into the fibrous material of 15mm, the fibrous material is placed in 10kg sodium hydroxide solution, kept at 40 ℃ for 40min, add 10kg ethanol and 10kg of chloroacetic acid was heated to 70°C in a water bath and dried to a moisture content of 15%; (2) the fiber material, 15kg of acrylic acid, 0.05kg of N,N-methylenebisacrylamide and 0.14kg of ammonium persulfate were heated in a water bath to Stir at 80°C for 1 hour, dry, crush to 0.4mm to obtain straw colloid; (3) Mix 20kg of phosphogypsum with straw colloid to prepare modified phosphogypsum, the particle size of phosphogypsum is 20μm.

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Abstract

The invention discloses a retarder for recycled aggregate mortar, and a preparation method thereof, and relates to the technical field of building materials, wherein every 100 parts by weight of the retarder for the recycled aggregate mortar is prepared from the following components in parts by weight: 2.5 to 3.5 parts of sodium gluconate, 4.5 to 5.5 parts of white sugar, 1.5 to 2.5 parts of citric acid, 2 to 3 parts of amino trimethylene phosphonic acid, 2 to 3 parts of modified phosphogypsum, 1.5 to 2 parts of steel slag micro powder and the balance of water. The retarder for recycled aggregate mortar has the advantages of good compatibility with a cementing material, strong water retention and plasticity retention, prolongation of the setting time of the recycled aggregate mortar, prolongation of the operation time, and improvement of the compressive strength of the hardened mortar.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a retarder for recycled aggregate mortar and a preparation method thereof. Background technique [0002] The construction industry is a large household that produces waste, and it is also an important industry that can use waste to regenerate resources. Therefore, comprehensive utilization of construction waste can not only solve environmental problems caused by construction waste, but also an effective way to solve resources and protect the ecological environment. [0003] After specific treatment, crushing, grading and mixing of building materials in a certain proportion, the aggregates formed to meet different use requirements are recycled aggregates, and the recycled aggregates with a particle size larger than 4.75mm are called recycled coarse aggregates. The regenerated aggregate with a particle size range of 0.08-4.75mm is called regenerated sand (also known as r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B28/02C04B103/22
CPCC04B40/0039C04B28/02C04B2103/22C04B2201/50C04B2201/10C04B24/10C04B24/06C04B24/003C04B18/142C04B18/248C04B22/062C04B24/026C04B24/005C04B24/04C04B24/124C04B22/14C04B22/144C04B14/06C04B18/16
Inventor 易钢招庞永献庞森林
Owner 深圳市三绿科技有限公司
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