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Formula and preparation method for novel foam concrete

A foamed concrete and formula technology, applied in the field of building materials, can solve the problems of poor chemical properties, price differences in performance, intermittent toughness time, etc., to improve toughness resistance, water absorption and humidity control indicators, performance cost price stability Effect

Inactive Publication Date: 2018-09-28
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are some disadvantages in the research field of foaming agent and mixing ratio. For example, its toughness time is intermittent. Due to the increased ratio and the difference in the particle size of auxiliary materials, its chemical properties are poor, and various additives are incompatible, which makes the water absorption of foam concrete And humidity control index is low, performance and price are different, not conducive to long-term use

Method used

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preparation example Construction

[0016] A formulation and preparation method of a novel foam concrete, the specific steps are as follows:

[0017] 1. The foam concrete formula mainly includes cement 332kg / m 3 , fly ash 82kg / m 3 , water-binder ratio 0.46-0.52, foam 0.65-0.8m 3 / m 3 , Ceramsite 217kg / m 3 , glass beads 21kg / m 3 , airgel 1-4kg / m 3 , the total amount of fiber is 0.8kg-2.0kg, of which hemp fiber equivalent replaces 30% of polypropylene fiber, and the water reducer is 2.1kg / m 3 , the foam concrete mix design steps are as follows:

[0018] Step 1. Determine the dry density of foam concrete and the apparent density of ceramsite. First, determine the design dry density of ceramsite foam concrete. Under the condition that the mix ratio of the foam concrete foundation can be met, choose ceramsite with a smaller apparent density. , the apparent density of the selected ceramsite should be less than or equal to the design dry density;

[0019] Step 2. Determine the dosage of ceramsite and the amoun...

Embodiment 1

[0026] During the production process, increase the temperature of the foam concrete slurry, and control the temperature of the foam concrete slurry according to the bulk density of the foam concrete, and the bulk density is 200-1200kg / m 3 For foam concrete, the temperature of the foam concrete slurry is controlled between 20-75°C; in the step of entering the mold and curing, the insulation mold is used, and the initial setting time and final setting time temperature of the cement in the foam concrete slurry are controlled, so that The temperature of the foamed concrete slurry and the components formed by the foamed concrete slurry is controlled between 70-130°C during the period from 0.5 hours before the final setting time to 5 hours after the final setting time. By considering 1-2 times the surplus Volume, foam volume 0.65-0.8m 3 / m 3 ;Aerogel 1-4kg / m 3 ;The total amount of fiber is 0.8kg-2.0kg / m 3 , in which hemp fiber equivalent replaces 30% of polypropylene fiber; the a...

Embodiment 2

[0028] During the production process, increase the temperature of the foam concrete slurry, and control the temperature of the foam concrete slurry according to the bulk density of the foam concrete, and the bulk density is 200-1200kg / m 3 For foam concrete, the temperature of the foam concrete slurry is controlled between 20-75°C; in the step of entering the mold and curing, the insulation mold is used, and the initial setting time and final setting time temperature of the cement in the foam concrete slurry are controlled, so that The temperature of the foamed concrete slurry and the components formed by the foamed concrete slurry is controlled between 70-130°C during the period from 0.5 hours before the final setting time to 5 hours after the final setting time. By considering 1-2 times the surplus Volume, foam volume 0.65-0.8m 3 / m 3 ;Aerogel 1-4kg / m 3 ;The total amount of fiber is 0.8kg-2.0kg / m 3 , in which hemp fiber equivalent replaces 30% of polypropylene fiber; the a...

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Abstract

The invention discloses a formula and preparation method for novel foam concrete. The foam concrete mainly comprises the following formula materials: 332 kg / m<3> of cement, 82 kg / m<3> of fly ash, 0.65-0.8 m<3> / m<3> of foam, 217 kg / m<3> of ceramsite, 21 kg / m<3> of vitrified microbeads, 1-4 kg / m<3> of aerogel, 2.1 kg / m<3> of a water reducing agent, and 0.8-2.0 kg / m<3> of fibers, wherein a ratio of water to a binder is 0.46-0.52, and bast fibers replace 30% of polypropylene fibers in an equal amount manner. According to the method disclosed by the invention, plant fibers are the bast fibers prepared from waste hemp ropes, so that the method has a effect of turning waste into treasure, is energy-saving and high efficiency, and meets the requirements of sustainable development; and the preparedfoam is mixed into uniformly-stirred slurry for stirring and foam mixing according to density design requirements, so that the ceramsite foam concrete meeting the specification requirements can be produced, and the concrete can be used for preparing lightweight wallboards and building blocks.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a formulation and preparation method of a novel foam concrete. Background technique [0002] Foamed concrete, also known as foamed cement, lightweight concrete, etc., is a new type of building energy-saving material that is waste-friendly, environmentally friendly, energy-saving, inexpensive and non-combustible. Lightweight concrete (foamed concrete) is based on chemical or physical methods. The application needs to introduce air or nitrogen, carbon dioxide, oxygen and other gases into the concrete slurry, and after reasonable curing, the formed concrete products contain a large number of small closed pores and have considerable strength. Lightweight concrete (foamed concrete) The production is usually to prepare the foaming agent aqueous solution into foam by mechanical method. The specific operation is: prepare the foaming agent aqueous solution into foam by mechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B38/08C04B28/00C04B18/24C04B18/02
CPCC04B18/027C04B18/248C04B28/00C04B38/106C04B2201/20C04B2201/32C04B2201/50C04B38/08C04B38/0067C04B18/08C04B20/002C04B16/0633C04B2103/302C04B2103/42Y02W30/91
Inventor 吕恒林黄建恩冯伟李悦周淑春马全明
Owner CHINA UNIV OF MINING & TECH