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Sleeve grouting material for steel bar connection and preparation method thereof

A sleeve grouting and steel bar technology, which is applied in the field of construction engineering, can solve the problems of substandard vertical expansion rate, uneven quality, poor volume stability, etc., and achieve the effects of long working time, easy operation and simple preparation method

Inactive Publication Date: 2018-01-12
CNBM ZHONGYAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The quality of the existing sleeve grouting materials on the market is uneven, and there are phenomena such as rapid loss of fluidity, substandard early vertical expansion rate, low early and late strength, and poor late volume stability.

Method used

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  • Sleeve grouting material for steel bar connection and preparation method thereof
  • Sleeve grouting material for steel bar connection and preparation method thereof
  • Sleeve grouting material for steel bar connection and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] This embodiment provides a sleeve grouting material suitable for use at normal temperature (≥5°C) for non-shrinkage steel bar connections. The grouting material has high fluidity after leaving the machine and 30 minutes, micro-expansion, early strength and high strength, and is easy to produce and construct. , Long working hours, strong environmental adaptability.

[0037] In this embodiment, the cement is mainly composed of 5-100% by weight of ordinary Portland cement and 5-15% by weight of sulphoaluminate cement, and the cement strength grade is not lower than 42.5. Ordinary Portland cement with a cement strength grade of 42.5 is used to compound an appropriate amount of cement strength grade 42.5 sulfoaluminate cement, which can not only ensure the 1d and 3d strength of the grouting material at a low water-cement ratio, but also ensure the continuous growth of the later strength, and The quality of P.O42.5 cement is stable and easy to get.

[0038] Typical but non-l...

Embodiment approach 2

[0057] This embodiment provides a sleeve grouting material for non-shrinkage steel bar connection used at low negative temperature (-10°C-5°C). The grouting material has high fluidity, micro-expansion, early strength and high strength, and is easy to produce and construct. Etc.

[0058] In this embodiment, the cement is mainly composed of 5-10% by weight of ordinary Portland cement and 5-100% by weight of sulphoaluminate cement, and the cement strength grade is not lower than 42.5.

[0059] In this embodiment, the weight percentage of the modifier is 0.05-0.3%, specifically, the typical but non-limiting weight percentages of the modifier are 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.11% %, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.2%, 0.22%, 0.24%, 0.26%, 0.28%, or 0.3%. In terms of weight percentage, the regulator includes: polyether modified silicon defoamer 0.02-0.05%, retarder 0.03-0.1%, coagulation accelerator 0-0.04%, early strength agent 0.05-0.2%, vis...

Embodiment 1

[0077] The invention provides a sleeve grouting material suitable for use under normal temperature conditions, which comprises the following components in weight percent: 45% cement, 42% aggregate, 8% admixture, and 0.3% polycarboxylate superplasticizer %, plastic expansion agent 0.05%, compound expansion agent 4.58%, regulator 0.07%. The water-to-material ratio can be 0.14 in the preparation process of the sleeve grouting material for steel bar connection.

[0078] Among them, the cement is composed of 92% of ordinary Portland cement with a strength grade of 42.5 and 8% of sulphoaluminate cement with a strength grade of 42.5 by weight percentage.

[0079] The aggregate is washed, dried and screened river sand, which is compounded by weight percentage of 58% of 20-40 mesh and 42% of 40-70 mesh.

[0080] The regulator is composed of 60% defoamer, 15% retarder and 25% viscosity regulator by weight.

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Abstract

The invention provides a sleeve grouting material for steel bar connection and a preparation method thereof and relates to the technical field of construction engineering. The sleeve grouting materialfor the steel bar connection is mainly prepared from raw materials including cement, aggregate, an admixture, a polycarboxylic water reducer, a plastic expanding agent, a compound expanding agent, aregulator and the like; the sleeve grouting material has great machine discharging flowability and flowability after 30min, slight expansion, early strength and high strength, is easy to produce and construct in the aspect of construction and has the advantages of reliable quality, low cost, shortened construction period, convenience for utilization and the like; the sleeve grouting material has long working time and strong environmental adaptability. The preparation method provided by the invention is simple and easy to operate; the sleeve grouting material for the steel bar connection, whichis applicable to room-temperature, low-temperature and negative-temperature conditions, can be prepared through regulating the ratio.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a sleeve grouting material for steel bar connection and a preparation method thereof. Background technique [0002] Prefabricated buildings have the advantages of fast construction speed, energy saving and environmental protection, and integration, and have become an important development direction of contemporary architecture. The State Council promulgated (Guo Ban Fa (2016) No. 71) pointed out that it is necessary to accelerate the increase in the proportion of prefabricated buildings in the new construction area, and strive to make the proportion of prefabricated buildings in the new construction area reach 30% in about 10 years. Big cities such as Beijing and Shanghai even issued documents requiring that by 2020, the proportion should exceed 30%. At present, the sleeve grouting connection accounts for more than 80% of the vertical connection market of prefab...

Claims

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Application Information

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IPC IPC(8): C04B28/06
Inventor 范德科宋作宝马强王健单立福吴明慧郝利国梅海峰
Owner CNBM ZHONGYAN TECH
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