Precast dry-mix sprayed concrete

A technology of sprayed concrete and dry mixing, which is applied in the field of building materials, can solve problems such as unstable quality, environmental pollution, and high rebound rate, and achieve the effects of accelerated setting time, good heat resistance, and high mechanical strength

Active Publication Date: 2018-11-13
北京建工新型建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the dry mixing method is widely used in underground engineering in my country due to its strong adaptability (easy to use, flexible, and long-distance pressure delivery), small site requirements, low machine cost, and convenient operation; Its serious environmental pollution, large dust, low efficiency, unstable quality and high rebound rate limit its development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0046] Preparation Example 1: at room temperature, 20kg water and 5kg magnesium fluorosilicate were added to the four-necked flask, after the magnesium fluorosilicate was dissolved, 4kg triethanolamine and 0.5kg lauroyl diethanolamine were added, and the temperature was warming up to 60°C, After stirring at a speed of 200r / min for 15min, then add 55kg of aluminum sulfate, then continue to stir at a speed of 1000r / min for 1.5h; finally add 1kg of sodium ethylenediaminetetramethylene phosphate and stir for 20min to obtain a high-efficiency accelerator.

preparation example 2

[0047] Preparation Example 2: At room temperature, 22.5kg of water and 7.5kg of magnesium fluorosilicate were added to the four-necked flask, after the magnesium fluorosilicate was dissolved, 5kg of triethanolamine and 0.75kg of lauroyl diethanolamine were added, and the temperature was warming up to 75 ℃, after stirring at a speed of 250r / min for 12.5min, then adding 57.5kg of aluminum sulfate, and then continuing to stir at a speed of 1100r / min for 1.25h; finally adding 1.25kg of sodium ethylenediaminetetramethylene phosphate and stirring for 25min to obtain a high-efficiency Accelerator.

preparation example 3

[0048] Preparation example 3: at room temperature, 25kg water and 10kg magnesium fluorosilicate were added to the four-necked flask, after the magnesium fluorosilicate was dissolved, 6kg triethanolamine and 0.8kg lauroyl diethanolamine were added, and the temperature was warming up to 80°C, After stirring at a speed of 300r / min for 10min, then add 60kg of aluminum sulfate, and then continue to stir at a speed of 1200r / min for 1h; finally add 1.5kg of sodium ethylenediaminetetramethylene phosphate and stir for 30min to obtain a high-efficiency accelerator.

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Abstract

The invention discloses a precast dry-mix sprayed concrete which belongs to the technical field of building materials. The key point of the technical scheme is that the precast dry-mix sprayed concrete includes the following components in parts by weight: cement, pebbles, medium sand, a high-efficiency accelerator, a binder and a water reducer, wherein the cement is P.042.5 grade ordinary Portlandcement, the binder includes attapulgite, sodium silicate and potash water glass with the weight ratio of 2:1:1. According to the invention, cement-aggregate ratio and sand ratio are reasonably controlled, strength and compactness of concrete are improved, and on the other hand, dust pollution and disability are reduced; dryness of the dry mixture is improved through the attapulgite, sodium silicate and potash water glass, the adhesive force and viscosity after jetting are improved, the disability is reduced; besides, both sodium silicate and potash water glass have excellent heat resistance,thereby improving the heat resistance of the concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a prefabricated dry shotcrete. Background technique [0002] Shotcrete is a construction method of spraying and pouring fine stone concrete with a pressure spray gun. It is often used for filling tunnel linings, walls, ceilings and other thin-walled structures or linings of other structures and protective layers of steel structures. At present, there are mainly two spraying methods: dry mixing method and wet mixing method. ①Shotcrete dry mixing method: dry mixing method is to mix cement, sand, and stone evenly in a dry state, and send them and accelerators with compressed air. The method of spraying after spraying to the nozzle and mixing with pressure water; ②Shotcrete wet mixing method: The wet mixing method is to pump the mixed concrete to the nozzle through grouting, and then spray irrigation with compressed air. Mix and spray to minimize consiste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26
CPCC04B28/26C04B2111/00155C04B2201/50C04B7/02C04B14/02C04B14/102C04B22/126C04B24/122C04B22/148C04B24/12C04B2103/302
Inventor 王军李茂山张程浩孔凡敏刘迎杰
Owner 北京建工新型建材有限责任公司
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