Method for preparing PVA (Polyvinyl Alcohol) fiber and steel fiber reinforced concrete

A technology for reinforcing concrete and steel fibers, applied in cement production, etc., can solve the problems of high brittleness and low crack resistance, and achieve the effects of high tensile strength, good dispersion and good bonding performance

Inactive Publication Date: 2019-10-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is well known that the stronger the brittleness of the concrete material, the corresponding decrease in its toughness. Similar to ordinary concrete, geopolymer concrete is a highly brittle material, and still has the disadvantages of low crack resistance and high brittleness.

Method used

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  • Method for preparing PVA (Polyvinyl Alcohol) fiber and steel fiber reinforced concrete
  • Method for preparing PVA (Polyvinyl Alcohol) fiber and steel fiber reinforced concrete
  • Method for preparing PVA (Polyvinyl Alcohol) fiber and steel fiber reinforced concrete

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1PVA fiber and steel fiber reinforced concrete raw material

[0028] The raw materials used to prepare PVA fiber and steel fiber reinforced concrete in the present invention mainly include metakaolin, fly ash, sand, gravel, alkali activator, PVA fiber, steel fiber, water reducer, and the performance index of the raw material used meets the test requirements ,details as follows:

[0029] (1) fly ash

[0030] The fly ash that adopts in the present invention is the I grade fly ash that Luoyang Power Plant produces, and its main component and physical properties are shown in Table 1 and Table 2:

[0031] Table 1 Main chemical components of Class I fly ash

[0032]

[0033] Table 2 Main physical properties of Class I fly ash

[0034]

[0035]

[0036] (2) Metakaolin

[0037] The metakaolin used in the present invention is the high-quality metakaolin produced by Shijiazhuang Chenxing Industrial Co., Ltd., which has better activity and is easily activat...

Embodiment 2

[0069] Embodiment 2 PVA fiber and steel fiber reinforced concrete mix ratio design

[0070] The present invention mainly studies the influence of different dosages of PVA fibers and steel fibers on the basic mechanical properties and fracture properties of fiber-reinforced GPC. Therefore, in the process of designing the mix ratio, the different dosages of the two fibers are mainly considered, and the control variables are used in the test. The method is to fix the water-binder ratio, bone-bone ratio, sand rate, water glass modulus and alkali content and change the amount of PVA fiber or steel fiber alone.

[0071] Since GPC is still in the stage of research and development, there is no complete and unified mix ratio design procedure, so when designing the mix ratio of the benchmark GPC, it is mainly referred to the "Ordinary Concrete Mix Ratio Design Regulations" (JGJ55-2011) and domestic and foreign scholars' research on ground The research progress of polymer concrete mix ra...

Embodiment 3

[0076] The preparation technology of embodiment 3PVA fiber and steel fiber reinforced concrete

[0077] In the process of mixing fiber-reinforced geopolymer concrete, in order to ensure that the fibers can be evenly distributed and freely dispersed in the matrix, the different properties of the two fibers should be considered. Among them, PVA fiber is light in weight, short in length, and easy to absorb. Therefore, firstly, stir the PVA fiber and the cementitious material for 2 minutes. After mixing evenly, add the aggregate and stir for another 2 minutes. Finally, add the prepared alkali activator and high-efficiency water reducer to continue stirring. 2min; and the steel fiber has a large weight, firm quality, and a large amount of mixing, so the steel fiber, cementitious material and aggregate can be mixed and stirred for 2 minutes, and then the activator and water reducer are added and stirred for 2 minutes. When preparing the alkali activator, add flake NaOH into the wate...

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Abstract

The invention discloses a method for preparing PVA (Polyvinyl Alcohol) fiber and steel fiber reinforced concrete and belongs to the field of inorganic polymeric materials. The method comprises the following steps: material pretreatment, namely weighing water, metakaolin, fly ash, aggregate, an alkali activator, PVA fibers, steel fibers and a water reducing agent; preparation of PVA fiber and steelfiber reinforced concrete, namely stirring the PVA fibers, the fly ash and the metakaolin, adding the aggregate after uniform mixing, performing stirring, adding the steel fibers for stirring, addingthe alkali activator and the water reducing agent, and performing stirring, thereby obtaining the PVA fiber and steel fiber reinforced concrete. The GPC (Geopolymer Concrete) is prepared from the flyash, metakaolin, sodium hydroxide, potassium hydroxide, sodium silicate and aggregate, has good mechanical property and excellent rupture characteristics, and also has very wide application prospectsin the fields of buildings, roads and bridges, hydraulic engineering, military science and the like.

Description

technical field [0001] The invention relates to the field of inorganic polymer materials, in particular to a method for preparing PVA fiber and steel fiber reinforced concrete. Background technique [0002] Geopolymer refers to the use of alkaline activators to catalyze the excitation of natural minerals or solid wastes containing a large amount of silicon-aluminum oxides, and finally all materials are polymerized to form SiO 4 with AlO 4 It is the main form of three-dimensional network gel. Its formation process can be roughly divided into four parts: first, the solid raw material responsible for providing silicon-aluminum oxides undergoes a dissolution reaction in a high-alkali environment; secondly, these dissolved silicon-aluminum complexes diffuse from the solid surface into the solution, and at the same time Formation of polymeric silicic acid and silica-alumina oligomers; in the third step, silica-alumina polymers are formed by polycondensation reaction of silica-al...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/006C04B2201/50C04B16/0641C04B14/106C04B18/08C04B14/06C04B14/02C04B12/04C04B22/062C04B14/48C04B2103/302Y02P40/10
Inventor 张鹏李清富郑元勋王娟焦美菊万进一
Owner ZHENGZHOU UNIV
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