Moisture-absorbing expansion grouting mortar and its preparation method and its application in the construction of adjustable step height prefabricated stairs

A moisture-proof and mortar technology, applied in stairs, treads, stepped structures, etc., can solve the problems affecting the construction quality and pouring quality of prefabricated stairs, poor stability of drying shrinkage volume, and inability of expansion agents to work, and achieve stable construction performance. and volume stability, improve volume stability, and solve the effect of shrinkage cracking

Active Publication Date: 2022-03-01
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the pouring mortar used in the market has the disadvantages of unstable construction performance, easy segregation and bleeding under high flow conditions, poor stability of drying shrinkage volume, etc., which seriously affects the construction quality and pouring quality during the installation of prefabricated stairs.
During the installation process of adjustable step height prefabricated stairs, no wet curing is carried out, so that the traditional expansion agent cannot play a role, and the high-performance expansion agent with dual expansion sources with the function of absolute moisture expansion is limited because of its high price. Scale use

Method used

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  • Moisture-absorbing expansion grouting mortar and its preparation method and its application in the construction of adjustable step height prefabricated stairs
  • Moisture-absorbing expansion grouting mortar and its preparation method and its application in the construction of adjustable step height prefabricated stairs
  • Moisture-absorbing expansion grouting mortar and its preparation method and its application in the construction of adjustable step height prefabricated stairs

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preparation example Construction

[0069] The present invention also proposes a preparation method of moisture-absorbing expansion grouting mortar, which comprises the following steps:

[0070] Weigh the raw materials according to the aforementioned materials and proportions of the moisture-proof expansion grouting mortar, and mix them uniformly to obtain the moisture-proof expansion grouting mortar, which is a dry-mix composition.

[0071] The present invention also proposes an application of the moisture-insulating expansion grouting mortar prepared according to the aforementioned method in field installation of adjustable step height prefabricated stairs.

[0072] Preferably, it includes the following steps: adding water to the dry mix composition, stirring, and pouring.

[0073] Preferably, when the above-mentioned absolute moisture expansion grouting mortar is used in practice, 10-12% of its mass of water needs to be added and stirred by a mixer with a linear speed of 6-10 m / s for 3-5 minutes.

Embodiment 1～5

[0076] Weigh the raw materials according to the formula shown in Attached Table 1 and Attached Table 2, mix the various raw materials evenly, and add them to the mortar mixer together with water, wherein the weight of the added water accounts for 11.0% of the perfusion mortar dry mix composition, and the stirring blade The linear speed is 8m / s, and the rapid stirring is 4 minutes, and the moisture-absorbing grouting mortar with high fluidity, early strength and fast hardening, and no shrinkage can be obtained.

[0077] Among them, the mass percentage ratio of the three-stage gradation of quartz sand is 30.0% of 20-40 mesh quartz sand, 40.0% of 40-70 mesh quartz sand, and 30.0% of 70-120 mesh quartz sand.

[0078] According to GB / T 50448-2015 "Technical Specifications for Application of Cement-Based Grouting Materials", perform performance tests such as initial fluidity, 30min fluidity, 1d compressive strength, 3d compressive strength, 28d compressive strength and 24h vertical e...

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Abstract

The main purpose of the present invention is to provide a moisture-insulating expansion grouting mortar and its preparation method and its application in the construction of adjustable step height prefabricated stairs. The pouring mortar includes 15%-25% of steel slag, 5%-12% of slag, 10%-15% of Portland cement clinker, 3%-4% of waste gypsum in terms of mass percentage, and the flow state is stable and improved. 2% to 3% of non-reactive materials and 45% to 55% of quartz sand; weigh the raw materials according to the aforementioned proportion, mix them evenly to obtain a dry mix composition; add water to stir and pour. The technical problem to be solved is to make the pouring mortar have stable high fluidity and filling properties, so that it can establish effective expansion to compensate for volume shrinkage, crack resistance, early strength and rapid hardening without watering and maintenance. Therefore, the construction progress is accelerated, and it is especially suitable for on-site installation of prefabricated stairs with adjustable step height.

Description

technical field [0001] The invention belongs to the technical field of grouting mortar manufacturing, in particular to a moisture-absorbing expansion grouting mortar and its preparation method and its application in the construction of adjustable step height prefabricated stairs. Background technique [0002] Chinese patent CN208168196U discloses a prefabricated staircase with adjustable step height, wherein the steps of the adjustable step height prefabricated staircase are prefabricated separately from the stair boards. The production mold of the prefabricated step can be adjusted arbitrarily according to the type of the pedal; the production mold of the prefabricated step board is also easier and the size can be adjusted arbitrarily. Therefore, the adjustable step height prefabricated stairs can improve the utilization rate of the mold and reduce the amortization cost of the mold. Reserved steel bars are set between the top area of ​​the prefabricated stair slab and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04E04F11/104
CPCC04B28/04E04F11/1041C04B2201/50C04B2111/00017C04B18/142C04B18/141C04B22/143C04B14/06C04B2103/302C04B2103/50C04B24/383
Inventor 魏丽颖李长成郑永辉贾福杰赵顺增
Owner CHINA BUILDING MATERIALS ACAD
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