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Special dry-mixed mortar for plastering construction via 2D guniting method

A dry-mixed mortar and shotcrete technology, applied in the field of mortar, can solve the problems of low tensile bond strength, low early strength, and high bond strength, and achieve the effects of reducing porosity, reducing shrinkage deformation, and solving dust accumulation.

Active Publication Date: 2021-03-26
GUANGZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to design a special dry-mixed mortar for 2D spraying plastering construction, which solves the problems of segregation bleeding, low early strength, non-waterproof, low tensile bond strength, and easy initial micro-cracks in the mortar. , rough surface and easy dust accumulation, good workability, high bonding strength, can effectively prevent plastering layer mortar from falling off, hollowing and cracking, and has excellent cost performance, eliminating the obstacles to the promotion of mechanical spraying technology, thus solving the problem of people A series of problems brought about by the work

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  • Special dry-mixed mortar for plastering construction via 2D guniting method

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preparation example Construction

[0049] The preparation method of the special dry-mixed mortar for 2D shotcrete plastering construction of the present invention comprises the following steps: putting sand, Portland cement, low-alkalinity sulfoaluminate cement and glass powder into a mixer, and dry-mixing for 60-120s; Then add polypropylene fibers in the state of low-speed rotation of the mixer, the purpose is to disperse the fibers evenly, and stir for 20-40s; finally add limestone powder, wollastonite powder, latex powder, rubber powder, cellulose ether, early strength agent, expansion agent and Water reducing agent, stir for 120-150s. After the mixture is evenly stirred, it is packaged and transported to the construction site. Add water and mix well at the construction site before use. In the whole preparation process, the amount of materials is accurately weighed according to the mixing ratio.

[0050] In the following examples, the strength grade of Portland cement and sulfoaluminate cement is not less tha...

Embodiment 1

[0052] A special dry-mixed mortar for 2D shotcrete plastering construction is prepared from the following raw materials by weight:

[0053] 441 parts of ordinary Portland cement, 45 parts of sulfoaluminate cement, 1150 parts of river sand, 213 parts of water, 1 part of cellulose ether, 46 parts of early strength agent, 36 parts of swelling agent and 8 parts of water reducing agent.

[0054] The preparation method of the present embodiment comprises the following steps:

[0055] (1) In the test preparation stage, first weigh the above-mentioned various materials required;

[0056] (2) Put the weighed river sand, ordinary Portland cement and sulfoaluminate cement into the mixer, and dry mix for 60-120s;

[0057](3) Finally, add the weighed water, cellulose ether, early strength agent, swelling agent and water reducing agent, stir for 120-150s, and the mixture can be used after stirring evenly.

Embodiment 2

[0059] A special dry-mixed mortar for 2D shotcrete plastering construction is prepared from the following raw materials by weight:

[0060] 401 parts of ordinary Portland cement, 32 parts of sulfoaluminate cement, 1000 parts of river sand, 213 parts of water, 27 parts of polypropylene fiber, 50 parts of limestone powder, 30 parts of glass powder, 24 parts of wollastonite powder, 8 parts of latex powder 12 parts of rubber powder, 1 part of cellulose ether, 46 parts of early strength agent, 36 parts of swelling agent, and 8 parts of water reducing agent.

[0061] The preparation method of the present embodiment comprises the following steps:

[0062] (1) In the test preparation stage, first weigh the above-mentioned various materials required;

[0063] (2) Put the weighed river sand, Portland cement, sulfoaluminate cement and glass powder into the mixer, and dry mix for 60-120s;

[0064] (3) Add the weighed polypropylene fiber under the low-speed rotation of the mixer, and sti...

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Abstract

The invention discloses special dry-mixed mortar for plastering construction via a 2D guniting method. The dry-mixed mortar is prepared from ordinary Portland cement, sulphoaluminate cement, river sand, water, polypropylene fibers, limestone powder, glass powder, coating-grade wollastonite powder, latex powder, rubber powder, cellulose ether, an early strength agent, an expanding agent and a waterreducing agent. The mortar has the advantages of solving the problems of segregation, bleeding, low early strength, no water resistance, low tensile bonding strength, easy generation of initial micro-cracks, rough surface, easy dust accumulation and the like of conventional mortar, and being good in workability, high in bonding strength, capable of effectively preventing the mortar of a plaster layer from falling off, hollowing and cracking, excellent in cost performance and capable of eliminating obstacles in popularization of a mechanical guniting technology; and therefore, a series of problems caused by manual operation are solved.

Description

technical field [0001] The invention relates to a construction mortar, in particular to a special dry-mixed mortar for 2D shotcrete plastering construction, which belongs to the field of mortar. Background technique [0002] In the design of public buildings or residential buildings, the needs of building interior ventilation, various pipelines, cable arrangements, and organically connecting each floor to ensure the normal use of the building depend on the establishment of a certain number of brick and concrete structural system wells to achieve. At present, the mortar plastering on the inside of the shaft still mainly relies on the manual construction process of "laying and plastering". In actual engineering, the inner diameter of the shaft is very small, and in a narrow space, it is difficult to manually apply the cement mortar on the inner surface. Can not meet the "Ventilation and Air Conditioning Engineering Construction Quality Acceptance Specifications" (GB / T50243-201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2111/00155C04B2201/50C04B7/02C04B14/068C04B16/0633C04B14/28C04B14/22C04B14/043C04B24/24C04B24/383C04B2103/302C04B2103/0068
Inventor 张姣焦楚杰杨得卉
Owner GUANGZHOU UNIVERSITY
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