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Accelerating agent with good adaptability to cement with low alkali content and use method of accelerating agent

A quick-setting agent and adaptable technology, which is applied in civil engineering materials and civil engineering fields, can solve problems such as the incompatibility of the quick-setting agent, the inability of concrete to set quickly, and the impact on the construction progress and construction quality of shotcrete, and achieve the speed of strength development Ideal, less harmful to production and construction personnel and the environment, and low rebound rate

Pending Publication Date: 2022-07-08
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this kind of cement is used as the raw material of sprayed concrete, it is easy to cause the incompatibility of the accelerator, which is manifested in the fact that the concrete cannot set quickly after the accelerator is added, even if the amount of the accelerator is increased. This maladaptation is more prevalent when the coagulant
These problems have seriously affected the construction progress and construction quality of shotcrete

Method used

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  • Accelerating agent with good adaptability to cement with low alkali content and use method of accelerating agent

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Effect test

Embodiment 1

[0024] An accelerator with good adaptability to cement with low alkali content is composed of calcined alumite, sodium carbonate, shell calcined material separated during the preparation of machine-made sand, and diatomite, and the mass percentage of each composition is: calcined alum 20% of stone, 6% of sodium carbonate, 50% of calcined shell separated during the preparation of machine-made sand, and 24% of diatomaceous earth. The concrete prepared by mixing with low-alkali cement is sprayed for construction, and the dosage is 3% of the mass of the low-alkali cement.

Embodiment 2

[0026] An accelerator with good adaptability to cement with low alkali content is composed of calcined alumite, sodium carbonate, shell calcined material separated during the preparation of machine-made sand, and diatomite, and the mass percentage of each composition is: calcined alum 75% of stone, 2% of sodium carbonate, 20% of calcined shell separated during the preparation of machine-made sand, and 3% of expanded diatomaceous earth. The concrete prepared by mixing with low-alkali cement is sprayed for construction, and the dosage is 6% of the quality of the low-alkali cement.

Embodiment 3

[0028] An accelerator with good adaptability to cement with low alkali content is composed of calcined alumite, sodium carbonate, shell calcined material separated during the preparation of machine-made sand, and diatomite, and the mass percentage of each composition is: calcined alum 26% of stone, 4% of sodium carbonate, 30% of calcined shells separated during the preparation of machine-made sand, and 40% of expanded diatomaceous earth. The concrete prepared by mixing with low-alkali cement is sprayed for construction, and the mixing amount is 8% of the mass of the low-alkali cement.

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Abstract

The invention relates to an accelerator with good adaptability to cement with low alkali content and a use method of the accelerator. The accelerator comprises the following components in parts by weight: 20-75 parts of calcined alunite, 2-6 parts of sodium carbonate, 20-70 parts of calcined shell and 3-40 parts of diatomite. The use method is as follows: when the accelerator is used for spraying concrete, the mixing amount of the accelerator is 3-8% of the mass of low-alkali cement. Compared with the prior art, the concrete spraying agent is suitable for spraying construction of concrete prepared from cement with the alkali content smaller than or equal to 0.5%, has the advantages of being good in cohesiveness, rapid in setting and hardening, low in rebound rate, ideal in strength development speed and the like, and is suitable for open-air concrete spraying construction engineering such as mountain slope protection and pit backfilling.

Description

technical field [0001] The invention relates to the technical field of civil engineering materials and civil engineering, in particular to a quick-setting agent with good adaptability to cement with low alkali content and a method for using the same. Background technique [0002] my country's cement output has been ranked first in the world's cement output for 20 consecutive years. Due to the vast territory of our country and the great regional differences, the alkali content (Na 2 O+0.658K 2 O) less than 0.50%. Portland cement with an alkali content of less than 0.50% is also commonly referred to as "low-alkali Portland cement". The use of low-alkali cement in engineering can help prevent a series of durability problems such as alkali-aggregate reaction and resulting cracking and strength reduction. However, when this kind of cement is used as the raw material of shotcrete, it is easy to cause the incompatibility of the accelerator, which means that the concrete cannot ...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B103/12
CPCC04B40/0039C04B2103/12C04B22/142C04B22/10C04B22/064C04B14/08Y02W30/91
Inventor 孙振平耿瑶田俊涛张挺杨海静
Owner TONGJI UNIV
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