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Sleeve grouting material for negative temperature reinforcing steel bar connection and preparation method thereof

A technology of sleeve grouting and warm type, which is applied in the field of negative temperature sleeve grouting material and its preparation, can solve the constraints of the use scene and application range of sleeve grouting material for steel bar connection, cannot meet the lower temperature environment, and affect the steel bar Problems such as connection quality at joints can be achieved to reduce construction costs, ensure structural safety, and improve construction efficiency

Active Publication Date: 2018-12-14
WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grouting material provided by the invention needs to control the temperature of the mixing water at 10°C; the minimum temperature for mechanical performance testing is -5°C, and when the ambient temperature is lower than -10°C, the mechanical properties are difficult to meet the requirements
[0005] Another example is the invention patent "Sleeve grout for steel bar connection and its preparation method" with the patent number "201710895233.6", which provides a sleeve grout for non-shrinkage steel bar connection at (-10-5) ° C, but the There are some defects and inconveniences in the use of materials: the dry powder material needs to be kept at a constant temperature of 5°C for 24 hours; the temperature of the mixing water needs to be controlled at 20°C; it needs to be cured at 0°C for 5 hours before it can be placed at -10°C Continue to maintain
[0006] Some of the sleeve grouting materials for steel bar connection provided by the prior art cannot meet the lower temperature environment, and some use and maintenance processes are very complicated, which seriously restrict the use scenarios and application scope of the sleeve grouting material for steel bar connection , which affects the connection quality of the steel bar connection in the low temperature environment

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~3、 comparative example 1~2

[0036] The sleeve grouting material for the connection of negative temperature type steel bars prepared in Examples 1~3 and Comparative Examples 1~2 comprises 20% of ordinary cement, 25% of special cement, 43% of aggregate, and 7.7% of modified admixture by weight percentage , 0.05% of the early expansion component, 3.2% of the middle and late expansion component, 0.6% of antifreeze, and 0.45% of the functional component; wherein, the component ratio of the modified admixture is shown in Table 1 below.

[0037] The modified admixture raw material list of the sleeve grouting material for negative temperature type steel bar connection prepared in Table 1 embodiment 1~3, comparative example 1~2, unit: %

[0038] group name

Embodiment 4~5、 comparative example 3~4

[0040]The sleeve grouting materials for negative temperature steel bar connections prepared in Examples 4 to 5 and Comparative Examples 3 to 4 include ordinary cement, special cement, aggregate, modified admixture, early expansion component, and middle and late expansion component , antifreeze, functional components, the ratio of each raw material by weight percentage is shown in Table 2 below. Among them, the modified admixture is compounded by grinding 3.8% of organic silane coupling agent, 90.5% of modified nano silicon dioxide and 5.7% of ultrafine slag powder by weight percentage.

[0041] Table 2 The table of raw materials prepared by embodiment 4~5, comparative example 3~4, unit: %

[0042]

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Abstract

The invention relates to a sleeve grouting material for negative temperature reinforcing steel bar connection, wherein the sleeve grouting material comprises 12-29% of ordinary cement, 14-35% of special cement, 33-49% of an aggregate, 5-12% of a modification admixture, 0.01-0.075% of an early expansion component, 2-5% of a middle-later expansion component, 0.25-1.55% of an antifreeze agent and 0.35-0.7% of a function component according to the weight percentage. The modification admixture comprises an organosilane coupling agent, modified nano-silica and ultra-fine slag powder; the modified nano-silica is prepared by soaking nano-silica in a potassium hydroxide and / or sodium hydroxide saturated solution at room temperature, carrying out ultrasonic dispersion and mixing, then filtering, taking a filter residue, drying the filter residue, keeping the temperature constant at high temperature for 8 h, and then dropping to room temperature. The grouting material has good fluidity when beingmixed with 0 DEG C water at the temperature of -10 DEG C, is directly maintained for 1 d and 7 d at the temperature of -10 DEG C, then is maintained for 7 d at the temperature of -10 DEG C and then is transferred to 20 DEG C water and maintained for 28 d; the physical properties of the grouting material at all ages of maintenance at the temperature of -10 DEG C are better than those of conventional grouting materials; the grouting material, a mould and apparatus are not needed to be heated or insulated, so the cost is effectively reduced and the efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of cement-based building materials, in particular to a negative temperature sleeve grouting material and a preparation method thereof. Background technique [0002] In recent years, the recognition of prefabricated concrete structures from all walks of life has gradually increased, and the sleeve grouting connection technology of steel bars has been more and more widely used. As a kind of steel sleeve bonding material, the importance of sleeve grouting materials is gradually increasing. stand out. [0003] Sleeve grouting construction should generally be carried out at an environment above 5°C. The relevant domestic industry standards also stipulate that the ambient temperature should not be lower than 5°C during grouting construction; when the curing temperature of the connection part is lower than 5°C, heating and heat preservation should be adopted. measure. However, affected by the temperature and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2111/70C04B2201/50C04B2201/52C04B24/126C04B24/12C04B24/14C04B22/10C04B22/064C04B22/066C04B22/14C04B14/06C04B14/324C04B22/126C04B24/38C04B24/383C04B2103/302C04B24/42C04B14/062C04B22/062
Inventor 杨国刚吴文选柯伟席陈冬冬邹伟周壮侯维红苑立东
Owner WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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