CN-121974636-A - Basalt short fiber reinforced concrete outdoor hollow decorative plate and preparation method thereof

Abstract

The invention discloses a basalt short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof, and relates to the field of assembled buildings. Aiming at the problems that the traditional concrete outdoor hollow decorative plate is easy to crack, high in dead weight and low in durability, basalt short fibers are easy to agglomerate and weak in bonding force with a matrix interface, the invention prepares modified basalt short fibers by heat treatment and modification of modified coating solution, and the raw materials such as activated silica fume, pretreated fly ash and compound cement are mixed, and the basalt short fiber reinforced concrete outdoor hollow decorative plate is prepared by step stirring, cast-in-situ molding and graded maintenance.

Inventors

• MENG JIANJUN
• Yang Liuyiyi
• WANG JIANJUN
• DAI RUNDENG
• Zhai Linqi
• ZHANG HAO
• YANG XIAOHUA
• LU MIAO
• HUANG XINYI

Assignees

• 帆颖装配式建筑科技(新乡)有限公司
• 湖南工业大学

Dates

Publication Date

20260505

Application Date

20251208

Claims (9)

1. 1. A preparation method of a basalt short fiber reinforced concrete outdoor hollow decorative plate comprises the following preparation steps: S1, mixing activated silica fume, pretreated fly ash, compound cement and quartz sand, dry-mixing, adding water and a water reducing agent, wet-mixing, adding modified basalt short fibers, continuously stirring, and uniformly stirring to obtain fiber reinforced concrete; S2, transferring the fiber reinforced concrete into a hollow decorative plate mold, performing cast-in-situ molding, curing and demolding to obtain a molded outdoor hollow decorative plate; and S3, curing the formed outdoor hollow decorative plate to obtain the basalt short fiber reinforced concrete outdoor hollow decorative plate.
2. 2. The preparation method of the basalt short fiber reinforced concrete outdoor hollow decorative plate is characterized by comprising the following raw materials, by weight, 80-120 parts of compound cement, 30-75 parts of modified basalt short fibers, 8-36 parts of activated silica fume, 8-24 parts of pretreated fly ash, 40-108 parts of quartz sand, 2.0-4.2 parts of a water reducer and 55-75 parts of water in the step S1.
3. 3. The method for preparing the basalt short fiber reinforced concrete outdoor hollow decorative plate according to claim 1, wherein the preparation method of the modified basalt short fiber is as follows: A1, carrying out heat treatment on basalt short fibers at 500-600 ℃ for 1-2 hours to obtain heat-treated basalt short fibers; a2, dissolving sodium silicate, sodium hydroxide and sodium metaaluminate in water, and stirring until the sodium silicate, the sodium hydroxide and the sodium metaaluminate are completely dissolved to obtain a modified coating solution; a3, dipping the basalt short fiber subjected to heat treatment in a modified coating solution for 10-30 min, taking out, drying at 60-80 ℃ for 2-4 h, and curing at 150-200 ℃ for 1-2 h to obtain the modified basalt short fiber.
4. 4. The preparation method of the basalt short fiber reinforced concrete outdoor hollow decorative plate according to claim 3 is characterized in that the basalt short fiber reinforced concrete outdoor hollow decorative plate comprises, by weight, 100 parts of basalt short fibers, 10-20 parts of sodium silicate, 2-5 parts of sodium hydroxide, 1-3 parts of sodium metaaluminate and 50-100 parts of water.
5. 5. The method for preparing the basalt short fiber reinforced concrete outdoor hollow decorative plate according to claim 1, wherein the preparation process of the activated silica fume is as follows: b1, mixing superfine silica fume, a silane coupling agent KH550, citric acid and deionized water, and stirring and soaking in a water bath at 50-60 ℃ for 2-4 hours to obtain modified silica fume; And B2, heating the modified silica fume to 400-500 ℃, introducing saturated steam, preserving heat for 2-3 hours, cooling to below 200 ℃ finally, and naturally cooling to obtain the activated silica fume.
6. 6. The preparation method of the basalt short fiber reinforced concrete outdoor hollow decorative plate according to claim 1 is characterized in that the preparation process of the pretreated fly ash comprises the steps of grinding the first-grade fly ash to a specific surface area of 400m 2 /kg-500m 2 /kg, and activating with steam for 2h to 4h at 180 ℃ to 200 ℃ to obtain the pretreated fly ash.
7. 7. The method for preparing the basalt short fiber reinforced concrete outdoor hollow decorative plate according to claim 1, wherein the compound cement is formed by compounding Portland cement and aluminate cement according to the weight ratio of 85-95:5-15.
8. 8. The method for preparing the basalt short fiber reinforced concrete outdoor hollow decorative plate according to claim 1, wherein the curing process in the step S3 is specifically that the formed outdoor hollow decorative plate is subjected to steam curing for 48-72 h at 60-80 ℃, and after natural cooling, the basalt short fiber reinforced concrete outdoor hollow decorative plate is obtained by drying for 3-5 d at room temperature.
9. 9. A basalt short fiber reinforced concrete outdoor hollow decorative sheet manufactured by the manufacturing method of a basalt short fiber reinforced concrete outdoor hollow decorative sheet as claimed in any one of claims 1 to 8.

Description

Basalt short fiber reinforced concrete outdoor hollow decorative plate and preparation method thereof Technical Field The invention relates to the field of assembled buildings, in particular to a basalt short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof. Background The rapid development of the assembled building puts higher requirements on the comprehensive performance of the outdoor hollow decorative board, and the decorative board needs to have high strength, high crack resistance, light weight and high weather resistance so as to adapt to industrial construction and long-term outdoor service scenes. The mainstream concrete outdoor hollow decorative board in the market at present is mostly prepared by taking ordinary Portland cement as a base material and matching with conventional aggregate and fiber, and although the concrete outdoor hollow decorative board can meet the basic use requirement, obvious short boards exist in the aspect of performance balance. The problems of large self weight and poor heat preservation and insulation effect of the traditional concrete outdoor hollow decorative plate generally exist, and the problems of cracking, peeling and the like are easy to occur due to insufficient bonding force between aggregate and a matrix interface, so that the appearance integrity of the decorative plate is reduced, the service life of the decorative plate is greatly shortened, and the later maintenance cost is increased. Meanwhile, the compression resistance, the crack resistance and the bending strength of the decorative plate are difficult to consider, the application requirements of the ultra-high strength grade cannot be met, and the popularization of the decorative plate in high-requirement assembly type building scenes is limited. In order to solve the above problems, the prior art attempts to optimize performance by adding short fibers, modified ceramsite and the like, but there is still a key technical bottleneck. On one hand, basalt short fibers are easy to agglomerate when directly doped, the interfacial binding force between the basalt short fibers and a concrete matrix is difficult to effectively improve by a conventional surface modification means, the reinforcing and toughening effects of the fibers cannot be fully exerted, on the other hand, the pretreatment of ceramsite is mostly carried out by adopting a single pre-water absorption or simple polymer coating mode, the water absorption rate is difficult to reduce, the compatibility with the cement matrix is improved, and the light weight and the durability improvement effect of the decorative plate are limited. Disclosure of Invention In view of the above, the invention aims to provide the basalt short fiber reinforced concrete outdoor hollow decorative plate and the preparation method thereof, which effectively solve the problems that the traditional concrete outdoor hollow decorative plate has large weight, poor heat preservation and insulation effects, easy cracking and peeling, insufficient durability, difficult combination of compression resistance, cracking resistance and bending strength, easy agglomeration when being directly doped with basalt short fibers and weak interface binding force with a concrete substrate. The aim of the invention can be achieved by the following technical scheme: In a first aspect, the invention provides a preparation method of a basalt short fiber reinforced concrete outdoor hollow decorative plate, which comprises the following preparation steps: S1, mixing activated silica fume, pretreated fly ash, compound cement and quartz sand, dry-mixing, adding water and a water reducing agent, wet-mixing, adding modified basalt short fibers, continuously stirring, and uniformly stirring to obtain fiber reinforced concrete; S2, transferring the fiber reinforced concrete into a hollow decorative plate mold, performing cast-in-situ molding, curing and demolding to obtain a molded outdoor hollow decorative plate; and S3, curing the formed outdoor hollow decorative plate to obtain the basalt short fiber reinforced concrete outdoor hollow decorative plate. Further, the step S1 comprises the following raw materials, by weight, 80-120 parts of compound cement, 30-75 parts of modified basalt short fibers, 8-36 parts of activated silica fume, 8-24 parts of pretreated fly ash, 40-108 parts of quartz sand, 2.0-4.2 parts of water reducer and 55-75 parts of water. Further, the preparation method of the modified basalt short fiber comprises the following steps: A1, carrying out heat treatment on basalt short fibers at 500-600 ℃ for 1-2 hours to obtain heat-treated basalt short fibers; a2, dissolving sodium silicate, sodium hydroxide and sodium metaaluminate in water, and stirring until the sodium silicate, the sodium hydroxide and the sodium metaaluminate are completely dissolved to obtain a modified coating solution; a3, dipping the basalt short fiber subjected to heat tre