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A kind of high rheological geopolymer mortar and its preparation method
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A geopolymer and rheological technology, applied in the direction of conjugated synthetic polymer rayon, rayon manufacturing, cement production, etc., can solve the problem of increasing yield strength, plastic viscosity and thixotropy, and reducing the fluidity of geopolymer mortar and other problems to avoid the decline in mechanical properties, increase in fluidity, and reduce the agglomeration performance.
Active Publication Date: 2021-11-23
ZHENGZHOU UNIV
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However, with the increase of PVA doping amount, the fluidity of geopolymer mortar decreases, and the yield stress, plastic viscosity and thixotropy become larger, which increases the viscosity of its construction, although the incorporation of nano-silica makes the mixed system The increase of the specific surface area increases the amount of adsorbed water on the surface, which can increase the fluidity of the mortar to a certain extent. A small amount of filling water reduces the fluidity of geopolymer mortar and increases yield strength, plastic viscosity and thixotropy
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Embodiment 1
[0029] Weighing raw materials: 410 parts of metakaolin, 160 parts of fly ash, 500 parts of alkali activator, 5 parts of water reducing agent, 120 parts of water, 600 parts of quartz sand, 50 parts of PVA powder, 15 parts of nano silicon dioxide, graphene 10 parts, 8 parts of rubber powder, 4 parts of surfactant;
[0030] Preparation:
[0031](1) Take the rubber powder and soak it in 1mol / L sodiumhydroxide solution for 1h, remove it, wash it, dry it at 80°C, put it in an ethanol solution containing a silanecoupling agent with a concentration of 50g / L, soak it for 1h, and wash it again for 80°C. ℃ drying to obtain modified rubber powder;
[0032] (2) Put the PVA powder in water and heat it at 80°C to dissolve it. Slowly add surfactant, nano-silicon dioxide, and modified rubber powder in sequence under stirring. After adding each raw material, stir and mix for 10 minutes, and continue heating and dissolving to obtain a mixture. Perform electrospinning to obtain modified PVA f...
Embodiment 2
[0035] Same as Example 1, the difference is that raw materials: 430 parts of metakaolin, 180 parts of fly ash, 510 parts of alkali activator, 3 parts of water reducing agent, 110 parts of water, 610 parts of quartz sand, 60 parts of PVA powder, nano-dioxide 10 parts of silicon, 8 parts of graphene, 10 parts of rubber powder, and 5 parts of surfactant.
Embodiment 3
[0037] Same as Example 1, the difference is that raw materials: 4500 parts of metakaolin, 200 parts of fly ash, 520 parts of alkali activator, 1 part of water reducing agent, 120 parts of water, 620 parts of quartz sand, 30 parts of PVA powder, nano-dioxide 20 parts of silicon, 5 parts of graphene, 5 parts of rubber powder, and 3 parts of surfactant.
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Abstract
The invention discloses a polymermortar with high rheology and a preparation method thereof. The raw materials include metakaolin, fly ash, alkali activator, water reducer, water, quartz sand, PVA powder, nano silicon dioxide, graphene, Rubber powder and surfactant; the preparation method includes: soaking the rubber powder in sodiumhydroxide solution and then soaking in ethanol solution of silanecoupling agent to obtain modified rubber powder; heating and dissolving PVA in water, adding surface active Agent and nano-silica, modified rubber powder, heating to obtain a mixture, and electrospinning to obtain modified PVA fibers; take metakaolin, fly ash and quartz sand and stir, and in the case of stirring, add alkali activator, graphene As well as modified PVA fiber, add water reducer after mixing evenly, and continue stirring evenly to obtain high rheological polymermortar. The geopolymermortar prepared by the invention has good rheological and mechanical properties and can meet construction requirements.
Description
technical field [0001] The invention relates to the field of inorganic polymer materials, in particular to a polymer mortar with high rheology 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 co...
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