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Anti-freezing high-ductility cement-based material as well as preparation method, application and application method thereof

A cement-based material with high ductility technology, applied in the field of cement-based materials, can solve the problems of concrete falling off easily, poor fatigue resistance, poor crack resistance, etc., to prolong the initial rust time, strong fatigue resistance, and enhance fatigue resistance performance effect

Active Publication Date: 2022-03-15
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the wet joint is at the negative bending moment of the continuous girder bridge, and the concrete is prone to fall off and crack under the action of freeze-thaw cycle in the severe cold area in the north, it often leads to the cracked work of the bridge after it is opened to traffic, leading to problems such as premature corrosion of steel bars
[0004] Therefore, a frost-resistant high-ductility cement-based material is studied, which is used in a fatigue-resistant RC continuous beam bridge structure in the negative moment zone to overcome the negative moment zone The technical problems of poor fatigue resistance, poor frost resistance, and poor crack resistance are of great value and significance to prolong the service life of continuous girder bridges

Method used

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  • Anti-freezing high-ductility cement-based material as well as preparation method, application and application method thereof
  • Anti-freezing high-ductility cement-based material as well as preparation method, application and application method thereof
  • Anti-freezing high-ductility cement-based material as well as preparation method, application and application method thereof

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preparation example Construction

[0054] The present invention also provides a method for preparing the frost-resistant high-ductility cement-based material, comprising the following steps:

[0055] 1) Mix cement, high-calcium fly ash, quartz sand and thickener to obtain powder;

[0056] 2) mixing the water reducer, defoamer and water to obtain a mixed solution;

[0057] 3) mixing the mixed liquid and the powder to obtain a paste;

[0058] 4) The paste is mixed with polyvinyl alcohol fibers to obtain a frost-resistant high-ductility cement-based material.

[0059] The mixing time in step 2) of the present invention is preferably 1-4 minutes, more preferably 2-3 minutes; the mixing can obtain a uniform powder.

[0060] The mixing time of step 3) of the present invention is preferably 4 to 10 minutes, more preferably 3 to 6 minutes of low-speed stirring, and then 1 to 3 minutes of high-speed stirring; more preferably 4 to 5 minutes of low-speed stirring, and then 2 minutes of high-speed stirring; the low-speed...

Embodiment 1

[0085]Stir and mix 2900g Portland cement (strength grade 42.5R), 6900g high-calcium fly ash (particle size ≤ 65μm), 6500g quartz sand (particle size 0.08mm), MK-100000S hydroxypropyl methylcellulose 2min to obtain a uniform powder. Stir and mix the modified polycarboxylate Sika-III water reducer and JXPT-1206 defoamer in water to obtain a mixed liquid. The mass ratio of modified polycarboxylate water reducer, defoamer, and hydroxypropyl methylcellulose is 1.1:0.1:0.9, and the mass ratio of modified polycarboxylate water reducer to cement is 3.5: 100. Stir the powder in the mixed solution at a low speed for 3 minutes (the rotation speed of the stirring blade is 137r / min, and the revolution speed is 59r / min), and then stir at a high speed for 1.5min (the rotation speed of the stirring blade is 278r / min, and the revolution speed is 50r / min). 118r / min), to obtain a paste. Add the polyvinyl alcohol fiber into the paste, stir at a low speed for 1.5min (the rotation speed of the s...

Embodiment 2

[0087] Stir and mix 3400g Portland cement (strength grade 42.5R), 7500g high-calcium fly ash (particle size ≤ 55μm), 7100g quartz sand (particle size 0.12mm), MK-100000S hydroxypropyl methylcellulose 3min to obtain a uniform powder. Stir and mix the modified polycarboxylate Sika-III water reducer and JXPT-1206 defoamer in water to obtain a mixed liquid. The mass ratio of modified polycarboxylate water reducer, defoamer, and hydroxypropyl methylcellulose is 1.5:0.2:1.5, and the mass ratio of modified polycarboxylate water reducer to cement is 5: 100. Stir the powder in the mixture at a low speed for 5 minutes (the rotation speed of the stirring blade is 144r / min, and the revolution speed is 66r / min), and then stir at a high speed for 3 minutes (the rotation speed of the stirring blade is 293r / min, and the revolution speed is 132r / min). / min) to get a paste. Add the polyvinyl alcohol fiber into the paste, stir at a low speed for 3 minutes (the rotation speed of the stirring b...

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Abstract

The invention belongs to the technical field of cement-based materials, and provides an anti-freezing high-ductility cement-based material which comprises cement, high-calcium fly ash, quartz sand, a water reducing agent, a thickening agent, a defoaming agent, polyvinyl alcohol fibers and water in specific mass and volume. The invention further provides a preparation method of the anti-freezing high-ductility cement-based material and application and an application method of the anti-freezing high-ductility cement-based material in a specific hogging moment area of a reinforced concrete continuous beam bridge. The anti-freezing high-ductility cement-based material can effectively reduce permeation of harmful ions such as chloride ions, prolong the initial rust time of steel bars, reduce the corrosion rate of the steel bars, improve the crack resistance and erosion resistance of a hogging moment area, enhance the fatigue resistance of the hogging moment area and prolong the service life of a continuous beam bridge. The structural form of the hogging moment area of the reinforced concrete continuous beam bridge has very high anti-fatigue performance, and the maintenance, repair and detection cost of the bridge in the later period is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of cement-based materials, in particular to a frost-resistant high-ductility cement-based material and a preparation method, application, and application method thereof. Background technique [0002] For reinforced concrete (Reinforced Conccrete, RC) continuous girder bridges, the construction method of simple support first and then continuous is usually adopted at present. , less expansion joints, short construction period and other advantages. The construction technology of simply supported first and then continuous girder bridges is that the girders and slabs are prefabricated in a prefabricated field. When hoisting, temporary supports are used to install the simply supported girders in place, and then permanent supports are preset on the pier, and the wet joint steel bars are connected and Wet joint concrete is poured, bridge deck prestressed beams are stretched, the system is converted into continuous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06C04B18/08E01D1/00E01D21/00E01D101/28C04B111/20
CPCC04B28/04C04B16/0641C04B18/08E01D1/00E01D21/00E01D2101/28C04B2111/2038C04B2111/20C04B2111/29C04B2201/50C04B14/06C04B2103/302C04B2103/44C04B2103/50Y02W30/91Y02A30/30C04B2111/766E01D2101/26C04B20/008C04B20/0076C04B24/2647C04B24/383C04B7/02C04B18/084C04B18/088C04B20/0048C04B24/2623C04B2103/601C04B2111/34C04B2111/76
Inventor 尹立强刘曙光闫长旺李丹青张菊王萧萧荆磊
Owner INNER MONGOLIA UNIV OF TECH
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