High-durability geopolymer mortar and preparation method thereof
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A geopolymer and durability technology, applied in the field of high-durability geopolymer mortar and its preparation, can solve problems such as inability to tightly bond, decrease in durability, and affect the durability of materials, so as to avoid agglomeration, enhance the promotion effect, The effect of avoiding cracks
Pending Publication Date: 2020-09-25
ZHENGZHOU UNIV
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However, because the agglomeration phenomenon between PVA fibers is easy to make the material structure loose, thus affecting the durability of the material, therefore, the amount of PVA added should not be too much; in addition, the compatibility of PVA fibers and gel materials is not good, and the two cannot Tight combination, resulting in micro-cracks at the PVA fiber, and the cracks around the PVA fibers that are closer to each other are connected, resulting in a looser structure and a decrease in the durability of the material
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Embodiment 1
[0029] Weigh raw materials, 200 parts of water, 410 parts of metakaolin, 160 parts of fly ash, 600 parts of quartz sand, 500 parts of alkali activator, 60 parts of PVA, 10 parts of graphene, 3 parts of microcrystalline cellulose, 20 parts of organic acid , 5 parts of surfactant, nano-SiO 2 40 parts, 5 parts of water reducer:
[0030] Preparation:
[0031] (1) Take 100 parts of water, disperse organic acid and microcrystalline cellulose in water under ultrasonic conditions at 60°C, stir evenly, add graphene and water reducing agent in sequence, disperse and stir evenly to obtain mixed solution A;
[0032] (2) Take the PVA material and put it in 100 parts of water and heat it at 95°C to dissolve it, and slowly add surfactant and nano-SiO in turn under stirring condition 2 , continue heating and dissolving to obtain mixture B, and perform electrospinning to obtain modified PVA fibers;
[0033] (3) Get metakaolin, fly ash and quartz sand and stir in the mixer, under the situati...
Embodiment 2
[0035] With embodiment 1, difference is, raw material, water 200 parts, metakaolin 430 parts, fly ash 180 parts, quartz sand 614 parts, alkali activator 516 parts, PVA 60 parts, graphene 5 parts, microcrystalline cellulose 3 parts Parts, 10 parts of organic acid, 5 parts of surfactant, nano-SiO 2 50 parts, 3 parts of water reducer.
Embodiment 3
[0037] Same as Example 2, the difference is that graphene and microcrystalline cellulose are not added.
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Abstract
The invention discloses high-durability geopolymer mortar and a preparation method thereof. The geopolymer mortar is prepared from the following raw materials: water, metakaolin, fly ash, quartz sand,an alkali activator, PVA, graphite, microcrystalline cellulose, organic acid, a surfactant, nano SiO2 and a water reducing agent. The preparation method comprises the following steps of: dispersing the organic acid and the microcrystalline cellulose in water under an ultrasonic condition, uniformly stirring, and adding the graphene, the water reducing agent and the mixed solution A; heating and dissolving PVA in water, adding a surfactant and nano SiO2, carrying out electrostatic spinning to obtain modified PVA fibers; taking metakaolin, fly ash and quartz sand in a stirrer and stirring, adding the alkali activator and the mixed solution A, and adding the modified PVA fibers in batches to obtain the high-durability geopolymer mortar. The high-durability geopolymer mortar provided by the invention overcomes the technical problem of loose structure caused by overlarge fiber addition amount in the prior art, and the durability of the high-durability geopolymer mortar is significantly improved.
Description
technical field [0001] The invention relates to the field of inorganic polymer materials, in particular to a high-durability polymer mortar and a preparation method thereof. Background technique [0002] Concrete and mortar are widely used materials in hydraulic engineering and civil engineering, and play a key role in engineering construction. With the passage of time, many concrete structures in humid environments or industrial environments have suffered corrosion damage to varying degrees, resulting in a decrease in the durability of the structures and many potential safety hazards. Local repairs and reinforcements are urgently needed. According to data, cracking is common in domestic tunnel linings using concrete, and according to statistics, the cracking length accounts for about one-fifth of the total length; about half of the industrial and civil buildings have a serious aging period, and a large number of buildings have durability problems. Structural building colla...
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