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A concrete and volcanic ash technology, applied in the field of special preservatives, can solve the problems of poor adaptability of admixtures, low early strength, rapid slump loss, etc., and achieve no influence on setting time, stable early strength performance, and no influence on durability Effect
Active Publication Date: 2018-05-11
SICHUAN RUITIE TECH
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[0005] However, natural volcanic ash is loose and porous, has a large surface area, and strong adsorption. The concrete configured has a large water demand, rapid slump loss, poor adaptability to admixtures, low early strength, slow strength development, and insufficient durability. Only after improvement can it be used in various projects requiring high durability
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Embodiment 1
[0025] The raw material composition of the special preservative for pozzolan concrete weight part of the present embodiment:
[0026] Silica fume: 100 parts
[0027] Fly ash: 20 parts
[0028] Sodium carboxymethyl cellulose: 1.0
[0029] Water reducer (solid): 1.2 parts
[0030] Redispersible latex powder: 1.0 parts
[0031] Polyvinyl alcohol (solid): 1.0 parts
[0032] Triisopropanolamine (solid): 0.3 parts.
[0033]Add 20% of the weight of pozzolan into the pozzolan concrete marked C20. The performance index of the fresh pozzolan concrete obtained after mixing with other raw materials is: slump 200mm, slump loss ≤ 40mm in 1 hour; the performance index of hardened concrete is: 7d compressive strength 18.2MPa, 28d compressive strength 27.7MPa, The 56d compressive strength is 31.2MPa, the 56d electric flux is 302 coulombs, and the sulfate corrosion resistance coefficient is 1.05.
Embodiment 2
[0035] The raw material composition of the special preservative weight part of the volcanic ash of the present embodiment:
[0036] Silica fume: 100 parts
[0037] Fly ash: 5 parts
[0038] Sodium carboxymethyl cellulose: 1.0
[0039] Water reducer (solid): 2.0 parts
[0040] Redispersible latex powder: 2.0 parts
[0041] Polyvinyl alcohol (solid): 1.0 parts
[0042] Triisopropanolamine (solid): 0.5 parts.
[0043] Add 15% of the weight of the pozzolan into the pozzolan concrete marked C40. The performance index of the fresh pozzolan concrete obtained after mixing with other raw materials is: slump 180mm, slump loss ≤ 40mm in 1 hour; the performance index of hardened concrete is: 7d compressive strength 28.1MPa, 28d compressive strength 48.4MPa, The 56d compressive strength is 52.6MPa, the 56d electric flux is 311 coulombs, and the sulfate corrosion resistance coefficient is 1.03.
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Abstract
The invention discloses a preservative special for pozzuolana concrete. The preservative is prepared from silica fume, coal ash, sodium carboxymethylcellulose, a water reducer, latex powder, polyvinyl alcohol and triethanolamine. The preservative is particularly prepared from the following raw materials in parts by weight: 90-110 parts of silica fume, 5-20 parts of coal ash, 0.6-1.0 part of sodium carboxymethylcellulose, 1.0-2.0 parts of the water reducer, 1.0-2.0 parts of redispersible latex powder, 1.0-2.0 parts of solid polyvinyl alcohol and 0.1-0.5 part of solid triethanolamine; and 10%-20% of the preservative is mixed into mortar or concrete according to the weight of pozzuolana. Compared with the prior art, the preservative has the advantages that a certain amount of triisopropanolamine is doped as a concrete early strength agent, compared with sulfate and chlorine salt early strength agents, triisopropanolamine has the advantages that triisopropanolamine can be well fit with additives and has stable early strength, and the setting time and the durability are not influenced, so that the early strength of the pozzuolana concrete can be effectively improved, and the durability of the concrete can be improved.
Description
technical field [0001] The invention relates to a special preservative for pozzolan concrete, in particular to a special preservative for pozzolan concrete. Background technique [0002] Volcanic ash refers to gravel and mineral particles with a diameter less than 2mm erupted by volcanoes. During explosive volcanic movements, solid rocks and lava are decomposed into fine particles to form volcanic ash. Volcanic ash is formed at high temperature, the process is similar to the sintering reaction in cement kiln, and because the chemical composition of pozzolan is similar to that of cement, both contain CaO, SiO 2 、Al 2 o 3 etc., so the volcano has a certain gelling activity. At room temperature, in the presence of water, it can react with Ca(OH) 2 reaction to generate reaction products such as calcium silicate hydrate, calcium aluminate hydrate or calcium sulfoaluminate hydrate. [0003] In the cement-pozzolanic system, cement hydration produces a large amount of Ca(OH) 2...
Claims
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