A kind of non-alkali and chlorine-free concrete quick-setting agent based on magnesium carbonate trihydrate

A technology of magnesium carbonate trihydrate and accelerator, applied in the field of building materials, can solve the problems of high mechanical cost, complicated preparation process, high price and other problems of wet spraying machine, and achieve good adaptability, improved durability and less components. Effect

Active Publication Date: 2020-12-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the non-alkali liquid accelerator has many advantages compared with the traditional powder accelerator, but due to the high price of the non-alkali liquid accelerator and the high mechanical cost of the wet spraying machine
The recently researched polymer modified accelerator has the problems of high cost and complicated preparation process

Method used

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  • A kind of non-alkali and chlorine-free concrete quick-setting agent based on magnesium carbonate trihydrate
  • A kind of non-alkali and chlorine-free concrete quick-setting agent based on magnesium carbonate trihydrate
  • A kind of non-alkali and chlorine-free concrete quick-setting agent based on magnesium carbonate trihydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the determination of this accelerator composition ratio

[0035] Referring to GB / T 35159-2017 "Accelerators for Shotcrete", in the experiment, the room temperature was 20.3°C, the water temperature was adjusted to 20±1°C, and the temperature of cement and accelerator components was 19±1°C. Since this accelerator is mainly based on MgCO 3 ·3H 2 O is the main component, so an accelerator with a dosage of 5% is used, and MgCO in the accelerator 3 ·3H 2 O accounts for 80%, 60%, and 40% respectively; slag powder accounts for 15%, 30%, and 45%; calcium carbonate accounts for 5%, 10%, and 15%. The specific experimental results are shown in Table 1.

[0036] According to the results of attached table 1, it can be seen that when the content of accelerator is kept at 5%, the MgCO in the components 3 ·3H 2 The higher the O content, the more obvious the quick-setting effect, so the quick-setting agent should be MgCO 3 ·3H 2 O is the main component, and other a...

Embodiment 2

[0037] Embodiment 2: the determination of this quick-setting agent dosage

[0038] Referring to GB / T 35159-2017 "Accelerators for Shotcrete", in the experiment, the room temperature was 20.3°C, the water temperature was adjusted to 20±1°C, and the temperature of cement and accelerator components was 19±1°C. Because this quick-setting agent in embodiment 1 MgCO 3 ·3H 2 The effect is best when O accounts for 80%, so the composition is 80% MgCO 3 ·3H 2 O, 15% slag powder, 5% calcium carbonate accelerator, the amount of accelerator was 3%, 5% and 7% respectively for initial and final setting experiments. Specific experimental methods such as figure 1 , see the attached table 2 for the specific experimental results.

[0039] It can be seen from the results of attached table 2 that the quick-setting agent component is kept at 80% MgCO 3 ·3H 2 O, 15% slag powder, 5% calcium carbonate, the more the accelerator is added, the more obvious the quick-setting effect will be.

Embodiment 3

[0040] Embodiment 3: Determination of the compressive strength of this quick-setting agent cement mortar

[0041] Referring to the relevant national specifications for the compressive strength test of accelerators, in the experiment, the room temperature was 20.3°C, the water temperature was adjusted to 20±1°C, and the temperature of cement, sand and accelerator components was 19±1°C. According to the dosage experiment of accelerator, this experiment adopts the dosage of accelerator 0%, 3%, 7% to conduct 1d and 28d compressive strength experiments of cement mortar. Specific experimental methods such as figure 2 , see the attached table 2 for the specific experimental results.

[0042] It can be seen from the results of attached table 2 that the quick-setting agent component is kept at 80% MgCO 3 ·3H 2 When O, 15% slag powder, 5% calcium carbonate, cement mortar 1d appears early strength phenomenon, compared with blank group, the compressive strength of 3% quick-setting age...

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Abstract

The invention discloses an alkali-free concrete accelerator based on magnesium carbonate trihydrate, and a using method thereof, and belongs to the technical field of accelerators. The accelerator component is magnesium carbonate trihydrate and accounts for 50-80% of the total amount of the accelerator, and the total doping amount of other raw materials is 20-50% of the total amount of the accelerator. The accelerator is free of alkalis and chlorine, and has little influence on the environment and personnel when in use; the accelerator has a remarkable coagulation accelerating effect at a lowmixing amount, the coagulation times of different cements can meet the accelerator using requirements of concrete in GB / T 35159-2017, the 28d compressive strength is increased by 26.7-33.0%, and the accelerator has good adaptability to different cements. Alkali-aggregate reaction and corrosion to reinforcing steel bars, caused by increase of the total alkali content, can be avoided. One of other auxiliary materials is a substance capable of reducing the concentration of calcium ions in a mixture solution, such as ground slag; and the other one is a carbonate substance used as a seed crystal, such as calcium carbonate, so that the compactness and durability of the concrete can be improved, the later strength of the concrete is improved, greenness and environmental protection are achieved, and the construction requirements of different environmental conditions are met.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to an alkali-free and chlorine-free concrete quick-setting agent based on magnesium carbonate trihydrate. Background technique [0002] Accelerator has an important influence on the setting speed of concrete. It is an indispensable additive in shotcrete construction method. The quality of its effect directly affects the spray quality and performance of shotcrete. The function of the quick-setting agent is to accelerate the hydration and hardening of the cement and form sufficient strength in a short period of time to meet the requirements of special construction. Accelerators are widely used in highways, railways, bridges, mines, shafts, caves, tunnels, national defense, water conservancy and other engineering constructions, leak prevention and plugging, ground concrete rapid construction and concrete emergency rescue projects. [0003] The main component of traditional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/10C04B28/00C04B103/12
CPCC04B28/00C04B40/0039C04B2103/12C04B2201/50C04B22/10C04B22/0006C04B14/06
Inventor 陈德平王英旺钟伟慈李灏于道涵
Owner UNIV OF SCI & TECH BEIJING
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