Magnesia fly ash cement composition, and product and manufacturing method thereof

A technology of fly ash cement and its composition, which is applied in the field of building materials engineering, can solve the problems of not being suitable for dismantling-free formwork, prone to alkali-aggregate reaction, etc., and achieve the effect of improving construction efficiency and increasing use value

Inactive Publication Date: 2020-11-17
北京水木华宸科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of fly ash and the presence of active silica in the cement hardened body, alkali-aggregate reaction is prone to occur at the contact interface when it is used as a non-dismantling solid formwork to cast in-situ cement, so it is not suitable for making a non-dismantling solid formwork

Method used

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  • Magnesia fly ash cement composition, and product and manufacturing method thereof
  • Magnesia fly ash cement composition, and product and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, making 20mm thick prefabricated building free from demolition laminated floor slab bottom slab

[0037] Al in the chemical composition detected after pre-homogenization of imported fly ash 2 o 3 26%, SiO 2 It is 48%, according to the proportioning ratio of each component material of the preferred magnesia fly ash cement of test is: 100 parts of light-burned magnesia, 50 parts of fly ash, 52 parts of magnesium sulfate heptahydrate, 0.7 part of phosphoric acid, 58 parts of water. According to the production process steps in the content of the invention, it is stirred into a magnesia fly ash cement slurry; after the slurry is made, 15 parts of wood chips are added and stirred into a slurry. The upper and lower layers of 200g per square meter of glass fiber mesh cloth are rolled into slabs, and they are cured in a curing room at 35 degrees Celsius for 8 hours to release the mold. After 15 days of natural curing, all performance indicators can reach JC / T412....

Embodiment 2

[0038] Embodiment 2, making 8mm thick frame type building production workshop without dismantling cast-in-place cement exterior wall formwork

[0039] Al in the chemical composition detected after pre-homogenization of imported fly ash 2 o 3 18%, SiO 2 According to the ratio of each component material of the preferred magnesia fly ash cement according to the test, it is by weight: 100 parts of light-burned magnesia, 58 parts of fly ash, 41 parts of magnesium sulfate heptahydrate, potassium dihydrogen phosphate 1.3 parts, 37 parts of water. According to the production process in the content of the invention, the magnesia fly ash cement clean slurry is stirred; after the clean slurry is made, it is mixed with 7 parts of modified vinylon fibers to form a magnesia fly ash cement semi-dry slurry. Cut off after being paved and formed, and stacked one by one on the stacker. After stacking to a certain height, apply a pressure of 5 MPa in a plane press, lock the mold clamping devic...

Embodiment 3

[0040] Example 3 Making hollow slats for partition walls in prefabricated buildings

[0041] Al in the chemical composition detected after pre-homogenization of imported fly ash 2 o 3 33%, SiO 2According to the ratio of each component material of the preferred magnesia fly ash cement according to the test, it is by weight: 100 parts of light-burned magnesia, 43 parts of fly ash, 56 parts of magnesium sulfate heptahydrate, sodium hexametaphosphate 1.0 parts, 63 parts of water. According to the production process steps in the content of the invention, it is stirred into a clean slurry of magnesia fly ash cement; after the clean slurry is made, add 30 parts of wood chips and 10 parts of chopped palm fiber, stir it into a slurry, and pour hollow strips into the hollow strips by group forming method After 3 hours of normal-pressure steam curing with molds, and 14 days of natural curing after demoulding, all performance indicators can meet the technical requirements specified in ...

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Abstract

The invention relates to a magnesia fly ash cement composition as well as a product and a manufacturing method thereof. The magnesia fly ash cement is prepared from light calcined magnesia, fly ash, magnesium sulfate heptahydrate, phosphoric acid or phosphate and water. The magnesia fly ash cement is used for manufacturing a high-performance disassembly-free mold fixing template, and has the following advantages that (1) the use value of the fly ash is improved; (2) the optimal states of physical and mechanical properties and chemical stability of the magnesia fly ash cement and products thereof are achieved; and (3) the building construction efficiency is improved.

Description

technical field [0001] The invention belongs to the field of building material engineering, and relates to a magnesia fly ash cement composition, a product and a preparation method thereof. Background technique [0002] Existing magnesium cements include magnesium oxychloride cement, magnesium oxysulfide cement, and magnesium phosphate cement. Magnesium oxychloride cement cannot be used to make non-demolition formwork due to moisture absorption, halogen return and metal corrosion; magnesium oxysulfide cement has poor mechanical properties and cannot meet the strength requirements of non-demolition formwork; magnesium phosphate cement reacts too fast, It is difficult to mechanize the production of non-demolition solid formwork. Chinese invention patent CN102701616B "a high-strength magnesia fly ash clinker-free cement" requires the ratio of fly ash to light-burned magnesia to be 100:30-40, that is, the ratio of light-burned magnesia to fly ash is 100 : 250-333. Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/04C04B7/26
CPCC04B9/04C04B7/26Y02P40/10
Inventor 丛鲁克谌萌马新花席凯原刘斌
Owner 北京水木华宸科技发展有限公司
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