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Open-cell foam cement and preparation method and application thereof

An open-cell foam and cement technology, which is applied in the field of open-cell foam cement and its preparation, can solve the problems that open-cell foam cement has not been publicly reported, and achieves low water absorption and thermal conductivity, high specific modulus and compression resistance. Strength, excellent cushioning effect

Inactive Publication Date: 2020-02-04
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many studies on the related fields of closed-cell foam cement, but there is no public report on the formation of open-cell foam cement.

Method used

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  • Open-cell foam cement and preparation method and application thereof
  • Open-cell foam cement and preparation method and application thereof

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preparation example Construction

[0029] The preparation method of the open-cell foam cement includes: mixing Portland cement and sand, adding water, stirring to obtain cement slurry, adding a foaming agent to the cement slurry, feeding gas, and controlling the gas rate to 0.5-2.5 mL / 50cm 3 Min, choose a ventilation device with a cuboid structure, and place it horizontally; install a rectangular sieve plate of equal area at the gas inlet, the diameter of the selected sieve plate should be fixed, and the number of meshes should be as small as possible. In this experiment, the selected diameter is 0.3mm , The mesh number is 50 mesh sieve plates. In the process of ventilation, the parameters of the process should be set reasonably. The temperature range of the aeration process is 25°C-45°C. The pressure cannot be too high and is related to the gas velocity. Control the gas rate to 0.5-2.5mL / 50cm 3 min. After being stirred for 20-35 minutes at a rotating speed of 2000-4000 rpm, it is solidified for 12-36 hour...

Embodiment 1

[0037] Embodiment 1: adopt formula to be the cement slurry system of 0.5% petroleum sulfonate+0.5% polyoxyethylene ether+99%, cement slurry formula is 35% portland cement, 50% sand and 14% water . Mix Portland cement and sand, add water and stir to form cement slurry, add petroleum sulfonate and polyoxyethylene ether to the cement slurry, stir, and then introduce air, control the ventilation rate to 0.5mL / 50cm 3 ·min, after stirring at 2000rmp / min for 20 minutes, the required open-cell foam cement can be obtained after curing for 24 hours. Among them, the coalescence rate of the obtained bubbles is consistent with the nucleation rate of the bubbles, which is 25mL / min. SEM of the prepared open-cell foam cement figure 2 shown. The bubble diameter is about 50nm.

[0038] After performance measurement: compressive strength up to 1.8Mpa, dry density up to 0.186g / cm 3 , The water absorption rate is 2.4%, and the thermal conductivity is 0.012W / (m.k).

Embodiment 2

[0039] Embodiment 2: adopt formula to be the cement slurry system of 0.5% sodium lauryl sulfonate+0.5% Tween+99%, the cement slurry formula is 40% Portland cement, 45% sand and 14% water. Mix Portland cement and sand, add water and stir to form a cement slurry, add sodium dodecylsulfonate and Tween to the cement slurry, stir, and then pass N 2 , control the ventilation rate to 1.0mL / 50cm 3 · min, after stirring at 2500rmp / min for 25 minutes, the open-cell foam cement was obtained through curing for 12 hours. In the preparation process, the mass fraction of the surfactant is controlled to be 0.5%, and the cement content is increased from 35% to 40%, and the open-cell foam cement can be prepared.

[0040] After performance testing: compressive strength up to 1.86Mpa, dry density up to 0.154g / cm 3 , The water absorption rate is 3.44%, and the thermal conductivity is 0.018W / (m.k).

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Abstract

The invention provides open-cell foam cement and a preparation method and application thereof. The preparation method includes the following steps: step 1, preparation of cement slurry: mixing, in percent by mass, 35%-40% of cement, 45%-50% of sand and 12%-15% of water; and step 2, adding 1%-3% of a foaming agent to the cement slurry, introducing air, controlling the air rate at 0.5-2.5 mL / 50 cm<3>.min, performing stirring at a speed of 2000-4000 rpm, and then performing curing so as to obtain the open-cell foam cement. Generated bubbles gather through control of an appropriate content of thefoaming agent, an appropriate content of cement, the aeration rate and stirring intensity, the bubble nucleation rate, the bubble gathering rate and the cement hydration rate; and moreover, since thebubble gathering rate and the cement hydration rate are controlled for a balance, the open-cell foam cement is prepared successfully.

Description

technical field [0001] The invention belongs to the technical field of ultra-light porous materials, and in particular relates to an open-cell foam cement and its preparation method and application. Background technique [0002] Foamed cement / concrete is a cement / concrete product that contains a large number of small closed pores and has considerable strength by introducing air, nitrogen, carbon dioxide or oxygen into the cement slurry through physical or chemical foaming methods. Foam cement / concrete occupies a pivotal position in the field of building materials due to its excellent properties, such as light weight, heat insulation, sound insulation, and low price. Foamed cement is also widely used in oil and gas operation lost zone cementing, long sealing section cementing and gas injection well cementing due to its advantages of low density, low permeability, reducing gas channeling and preventing casing corrosion. Cellular foam structure is the main form of expression. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B38/10C04B111/20C04B111/40
CPCC04B28/04C04B38/103C04B2111/2046C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B14/06C04B24/16C04B24/32
Inventor 燕永利牛梦龙吕博尹丰丰蔡雨秀奚琪张阳宋兆洋
Owner XI'AN PETROLEUM UNIVERSITY
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