Sleeve grouting material for reinforcing steel bar connection in winter construction and preparation method thereof

A technology of sleeve grouting and steel bars, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of frost heave damage, impossibility of construction, high maintenance cost, etc., and achieves reduced corrosion and good reliability constructive effect

Active Publication Date: 2021-07-02
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this period, the daily average temperature has dropped below 5°C. Under low temperature conditions, the hydration of cement is limited, and the early strength is too low. During the process of water cooling and freezing, ice expansion will occur, resulting in frost heave damage.
The internal structure of the grouting slurry will be damaged from the surface to the inside due to freezing, and the construction cannot be carried out. Moreover, the maintenance cost in winter is too high, and the construction steps are complicated, which also limits the development of prefabricated buildings.
Therefore, many scholars and manufacturers in the market have developed low-temperature sleeve grouting materials suitable for -5 to 10°C, which can meet the construction requirements at -5°C and meet the industry standard JG / T408 "Sleeves for Steel Bar Connections". The relevant description and technical indicators of low-temperature grouting materials in "Sleeve Grouting Materials", but the construction environment temperature in actual projects can be as low as -10°C or even lower, so the requirements for sleeve grouting materials are also more stringent

Method used

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  • Sleeve grouting material for reinforcing steel bar connection in winter construction and preparation method thereof
  • Sleeve grouting material for reinforcing steel bar connection in winter construction and preparation method thereof
  • Sleeve grouting material for reinforcing steel bar connection in winter construction and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] The sleeve grouting material for the connection of steel bars for winter construction in the present embodiment is composed of the following parts by weight:

[0026] P O52.5R 35 parts of ordinary Portland cement, 9 parts of high alumina cement, 5 parts of microbead fly ash, 34 parts of 20-40 mesh emery, 6 parts of 40-70 mesh emery, 3 parts of 70-140 mesh emery , 5 parts of anhydrite, 0.01 part of tartaric acid, 0.01 part of sodium gluconate, 0.1 part of lithium carbonate, 3 parts of ettringite expansion agent, 0.02 part of azodicarbonamide, 0.28 part of BASF F10 superplasticizer, Mingling Chemical 0.05 parts of P803 defoamer, 0.04 parts of nitrous acid rust inhibitor, 0.035 parts of hydroxypropyl methylcellulose ether, 0.2 parts of anti-saponification redispersible vinyl acetate / ethylene copolymer rubber powder, 0.1 parts of CSH nanoparticles, nitrous acid Sodium 0.4 parts.

[0027] After mixing the above materials evenly, place them in an environment of 8°C for 24 ho...

Embodiment 2

[0032] The sleeve grouting material for the connection of steel bars for winter construction in the present embodiment is composed of the following parts by weight:

[0033] 20 parts of P O52.5R ordinary portland cement, 15 parts of fast-hardening sulphoaluminate cement, 10 parts of high alumina cement, 5 parts of heavy calcium superfine powder, 20-40 mesh, washing, drying and screening of river sand 35 parts, 40-70 mesh washed, dried and screened river sand 5 parts, 70-140 mesh river sand 2 parts, anhydrous gypsum 4 parts, tartaric acid 0.025 parts, lithium carbonate 0.15 parts, quicklime expansion agent 4 parts, azo Diformamide 0.025 parts, Sika 325C water reducer 0.31 parts, Mingling Chemical P803 defoamer 0.05 parts, amino alcohol rust inhibitor 0.05 parts, hydroxypropyl methyl cellulose ether 0.03 parts, anti-saponification redispersible 0.15 parts of vinyl acetate / ethylene copolymer rubber powder, 0.1 parts of CSH nanoparticles, and 0.35 parts of sodium nitrate.

[0034...

Embodiment 3

[0039]The sleeve grouting material for the connection of steel bars for winter construction in the present embodiment is composed of the following parts by weight:

[0040] 35 parts of P O52.5R ordinary portland cement, 15 parts of rapid hardening sulphoaluminate cement, 5 parts of silica fume, 35 parts of 20-40 mesh machine-made sand, 7 parts of 40-70 mesh machine-made sand, 0.02 part of tartaric acid , 0.15 parts of lithium carbonate, 3 parts of ettringite expansion agent, 0.025 parts of azodicarbonamide, 0.27 parts of BASF melamine water reducing agent, 0.05 parts of Mingling Chemical P803 defoamer, 0.05 parts of amino alcohol rust inhibitor , 0.035 parts of hydroxypropyl methylcellulose ether, 0.1 parts of anti-saponification redispersible vinyl acetate / ethylene copolymer rubber powder, 0.1 parts of CSH nanoparticles, and 0.45 parts of sodium nitrate.

[0041] After mixing the above materials evenly, place them in an environment of 8°C for 24 hours, and measure the fluidit...

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Abstract

The invention discloses a sleeve grouting material for reinforcing steel bar connection in winter construction and a preparation method thereof. The grouting material mainly comprises the raw materials: cement, a mineral admixture, aggregate, a setting control component, an expanding agent, a water reducing agent, a defoaming agent, a corrosion inhibitor, a water-retaining agent, redispersible latex powder, a rheological stabilizer, an anti-freezing agent and the like, and is used for grouting connection of ribbed reinforcing steel bar sleeves of prefabricated building concrete prefabricated components in an environment of-10 to 10 DEG C. Under the low-temperature condition of fabricated construction in winter, the grouting material still has good hydration characteristic, can meet the requirements of related performance indexes in the industrial standard JG / T 408 'Sleeve Grouting Material for Reinforcement Connection' only through conventional maintenance without auxiliary heating, and has the properties of double expansion systems, good fluidity, low chloride ion content, early stage, high strength, no shrinkage and the like. The manufacturing method is simple, easy to operate and capable of meeting construction requirements.

Description

technical field [0001] The invention belongs to the technical field of prefabricated buildings, and in particular relates to a sleeve grouting material for steel bar connection in winter construction and a preparation method thereof. Background technique [0002] my country is now in the stage of modern industrialization development. The rapid development of the economy, the optimization and transformation of the industrial structure, the urgent task of environmental protection and the disappearance of the demographic dividend have brought good opportunities for the development of prefabricated buildings, a new structural system that is green and environmentally friendly, and are It is one of the key directions for the development of building structures in my country. According to the national development goals, by 2025, my country's prefabricated buildings will account for 30% of the new construction area. [0003] Grouting sleeve connection is the main way of longitudinal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B28/34C04B111/70
CPCC04B28/04C04B28/06C04B28/34C04B2111/70C04B2201/50C04B7/02C04B18/08C04B14/324C04B14/365C04B24/06C04B24/10C04B22/10C04B22/142C04B24/129C04B2103/302C04B2103/50C04B2103/601C04B24/383C04B2103/0057C04B22/085C04B14/28C04B14/06C04B22/064Y02W30/91
Inventor 韩梦迪阎明伟孙岩波李大宁李冲李云舟
Owner BEIJING ACAD OF BUILDING ENG
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