Preparation method and application of cement-based material additive

A technology of cement-based materials and additives, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve problems such as high cost, difficult hardening of liquid binders, and inability to put into practical engineering applications, etc., to achieve Improve engineering durability and service life, improve mineralization efficiency, and reduce dosage

Active Publication Date: 2020-09-29
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the above methods. The liquid binder is difficult to harden in the water environment, the mineral additives must be encapsulated to avoid premature failure, and the ion complexing agent is harsh on the repair environment. Moreover, these methods are expensive and often cannot be put into practical engineering applications.

Method used

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  • Preparation method and application of cement-based material additive
  • Preparation method and application of cement-based material additive
  • Preparation method and application of cement-based material additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Prepare equal quantities of calcium chloride solution and sodium bicarbonate solution, add organic template sodium dodecylsulfonate to the calcium chloride solution and sodium bicarbonate solution, the addition amount is 1g / L, and add magnetic particles Ferriferric oxide, the addition amount is 1g / L, the calcium chloride solution is slowly added dropwise to the sodium bicarbonate solution, the reaction temperature is 30°C, after standing for 2 hours, use centrifugal separation, wash the sediment with ethanol solution, and dry it Promptly obtain porous calcium carbonate microspheres;

[0035] (2) Inoculate Bacillus lysinus into the medium, the mass ratio of the inoculum to the medium is 1:100, the medium is deionized water 1000mL, peptone 8g, beef extract 2g, NaCl 1g, FeCl 2 0.4g, shake culture at constant temperature for 48 hours, add manganese chloride, a high-efficiency spore transformation agent, to the culture medium, and the addition amount is 1g / L, to obtain t...

Embodiment 2

[0039] (1) Prepare calcium chloride solution and sodium bicarbonate solution in equivalent quantities, add organic template sodium dodecylsulfonate to calcium chloride solution and sodium bicarbonate solution respectively, the addition amount is 10g / L, add magnetic particles Ferriferric oxide, the addition amount is 5g / L, the calcium chloride solution is slowly added dropwise to the sodium bicarbonate solution, the reaction temperature is 30°C, after standing for 2 hours, centrifugal separation is used, and the ethanol solution is used to wash the sediment, and after drying Promptly obtain porous calcium carbonate microspheres;

[0040](2) Inoculate Bacillus lysinus into the medium, the mass ratio of the inoculum to the medium is 2:100, the medium is deionized water 1000mL, peptone 12g, beef extract 3g, NaCl 5g, FeCl 2 0.6g, shake culture at constant temperature for 48 hours, add manganese chloride, a high-efficiency spore transformation agent, to the culture medium, and the a...

Embodiment 3

[0044] (1) Prepare calcium chloride solution and sodium bicarbonate solution in equivalent quantities, add organic template sodium dodecyl sulfonate to the calcium chloride solution and sodium bicarbonate solution, the addition amount is 5g / L, and add magnetic particles Ferriferric oxide, the addition amount is 2g / L, the calcium chloride solution is slowly added dropwise to the sodium bicarbonate solution, the reaction temperature is 30°C, after standing for 2 hours, the sediment is washed by centrifugation and ethanol solution, and dried Promptly obtain porous calcium carbonate microspheres;

[0045] (2) Inoculate Bacillus lysinus into the medium, the mass ratio of the inoculum to the medium is 1:100, the medium is deionized water 1000mL, peptone 10g, beef extract 2.5g, NaCl 2g, FeCl 2 0.5g, shake culture at constant temperature for 48 hours, add manganese chloride, a high-efficiency spore transformation agent, to the culture medium, and the addition amount is 2g / L, to obtain...

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Abstract

The invention discloses a preparation method and application of a cement-based material additive. The preparation method comprises the following steps: preparing a calcium chloride solution and a sodium bicarbonate solution with equal mass to prepare porous calcium carbonate microspheres; inoculating bacillus lysine into a culture medium, and adding a spore efficient transforming agent into a culture solution; putting the calcium carbonate microspheres into a lysine bacillus spore culture solution, and fully standing until the concentration of the spore culture solution tends to be stable so as to obtain calcium carbonate microspheres loaded with microbial spores; dissolving the calcium carbonate microspheres loaded with the microbial spores into a mixed solution of sodium alginate and barium silver, uniformly stirring, and coating the surface layers of the calcium carbonate microspheres through spray drying. Results show that the cement-based material additive prepared by the method is suitable for maritime work environments, can effectively fill and block cracks of cement-based materials, improves the durability of engineering and prolongs the service life of the engineering.

Description

technical field [0001] The invention belongs to the field of cement material modification, and relates to a preparation method and application of a cement-based material additive. Background technique [0002] Marine development requires the construction of a large number of marine or coastal projects. However, the relatively low tensile strength makes cement-based materials inevitably crack under the action of internal and external factors, and seawater contains Cl - , SO 4 2- and Mg 2+ After plasma intrusion reacts with cement hydration products, it will cause different degrees of erosion and damage to engineering structures, resulting in continuous degradation of cement-based materials, seriously affecting the durability and service life of buildings. Therefore, how to repair the cracks of cement-based materials in a timely and effective manner is one of the problems that need to be solved urgently to ensure the long-term safe operation of marine construction projects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/12C04B14/28C01F11/18
CPCC01F11/18C01F11/185C04B14/28C04B20/12C04B20/1018C04B20/1048C04B20/107
Inventor 詹其伟张爽爽冯蕾李涛刘仁杰尤俊齐
Owner JIANGSU UNIV OF SCI & TECH
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