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Sleeve grouting material for low-temperature cement-based steel bar connection

A sleeve grouting and cement-based technology, which is applied in the field of building materials, can solve the problems of slow hydration speed of dicalcium silicate, difficulty in ensuring strength, and slow hydration speed, so as to improve mechanical properties, increase added value, and reduce production costs. cost effect

Pending Publication Date: 2022-01-04
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The high belite cement with relatively high proportion is used in the grouting material for low temperature reinforcement sleeve connection provided by the patent application CN110950616A. The content of dicalcium silicate in the high belite cement is relatively high, but the hydration rate of dicalcium silicate itself is relatively low. Slower, the hydration rate is even slower in low temperature environment, so the early strength of the grouting material for low temperature steel sleeve connection is difficult to guarantee

Method used

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  • Sleeve grouting material for low-temperature cement-based steel bar connection
  • Sleeve grouting material for low-temperature cement-based steel bar connection

Examples

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Effect test

Embodiment 1

[0040] The low-temperature cement-based steel bar connection sleeve grouting material provided in this embodiment is composed of the following raw materials in parts by weight: 900 parts of cementitious material, 1000 parts of mixed aggregate, 65 parts of active admixture, and 35 parts of admixture; The cementitious material accounts for 45.0% of the total mass of the sleeve grouting material components for the low-temperature cement-based steel bar connection; , 74 parts of quartz sand with a particle size larger than 120 mesh, 148 parts with a particle size of 40-70 mesh, 148 parts with a particle size of 70-120 mesh, and 38 parts of sandstone aggregate with a particle size larger than 120 mesh; the admixture consists of 3.5 parts Water reducer, 9.5 parts of defoamer, 8 parts of early strength agent and 14 parts of antifreeze, said antifreeze is made up of 8.5 parts of calcium nitrite and 5.5 parts of sodium nitrite;

[0041] Wherein, the preparation method of the gelled mat...

Embodiment 2

[0050] The composition of the sleeve grouting material for low-temperature cement-based steel bar connection provided by this embodiment is exactly the same as that of Example 1; wherein, the preparation methods of the sandstone aggregate and the active admixture are all the same as in Example 1; different The feature is that the preparation method of the gelled material is:

[0051] Wherein, the preparation method of the gelled material is:

[0052] S1. Dry 480 parts of Portland cement clinker and 320 parts of sulphoaluminate cement clinker at 100°C to constant weight, and after cooling, grind them together in a ball mill until the specific surface area is 340-360m 2 / kg, to obtain clinker powder for later use; mix 55 parts of dihydrate gypsum with a particle size of ≤30mm and dried calcium sulfate content of 83% and 45 parts of dried limestone with a particle size of ≤30mm and mix them in a ball mill Grinding to obtain primary micropowder with sieve residue ≤ 5% through 80 ...

Embodiment 3

[0055] The composition of the sleeve grouting material for low-temperature cement-based steel bar connection provided by this embodiment is exactly the same as that of Example 1; wherein, the preparation methods of the sandstone aggregate and the active admixture are all the same as in Example 1; different The feature is that the preparation method of the gelled material is:

[0056] Wherein, the preparation method of the gelled material is:

[0057] S1. Dry 400 parts of Portland cement clinker and 400 parts of sulphoaluminate cement clinker at 200°C to constant weight, and after cooling, grind them together in a ball mill until the specific surface area is 340-360m 2 / kg, to obtain clinker powder for later use; mix 50 parts of dihydrate gypsum with a particle size of ≤30mm and dried calcium sulfate content of 83% and 50 parts of dried limestone with a particle size of ≤30mm and mix them in a ball mill Grinding to obtain primary micropowder with sieve residue ≤ 5% through 80 ...

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Abstract

The invention provides a sleeve grouting material for low-temperature cement-based steel bar connection, and belongs to the technical field of building materials. The sleeve grouting material is prepared from the following raw materials in parts by weight: 850 to 1000 parts of a cementing material, 950 to 1150 parts of mixed aggregate, 50 to 100 parts of an active admixture and 22 to 53 parts of an additive, wherein the cementing material is prepared by mixing and modifying Portland cement clinker and sulphoaluminate cement clinker. The sleeve grouting material for low-temperature cement-based reinforcing steel bar connection not only has excellent flowability, but also has excellent mechanical properties when being used at the temperature of-5 to 10 DEG C, and the early strength can also meet the requirements of practical application.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a sleeve grouting material for connecting low-temperature cement-based steel bars. Background technique [0002] The prefabricated building refers to a building made of reinforced concrete materials that are prefabricated with standard specifications in the factory using sophisticated equipment, transported to the construction site, and assembled with the prefabricated building components at the construction site. The construction mode of industrialized construction. Prefabricated buildings can reduce the requirements of on-site construction on site, temperature and other environmental conditions, reduce the area occupied by construction waste and environmental pollution, improve the appearance and structural performance of buildings, ensure the quality of components, and improve the construction safety level and construction efficiency. , The recycling rate of resources is imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/70
CPCC04B28/06C04B2111/70C04B2201/50C04B2201/52C04B22/00C04B14/02C04B14/06C04B18/141C04B18/146C04B22/064C04B22/085C04B2103/302C04B2103/50C04B2103/10Y02W30/91
Inventor 孙小巍许佳乐徐长伟刘思含张莉雪张如清
Owner SHENYANG JIANZHU UNIVERSITY
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