Graphene Oxide Composite Emulsion for Cement Shrinkage Control
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Solution Overview
Problem
Cement-based materials, such as concrete, suffer from significant cracking due to drying shrinkage, which affects the service life of structures, and existing anti-shrinkage agents like silane and butyl acrylate can impair cement hydration rates and strength.
Innovation Solution
A graphene oxide/butyl acrylate/silane composite emulsion is used as an anti-shrinkage agent, comprising graphene oxide, butyl acrylate, isobutyltriethoxysilane, sodium silicate, emulsifiers, and a dispersant, which slows water loss, promotes dense hydration structures, and enhances cement matrix strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If silane or butyl acrylate is used as anti-shrinkage agent, then drying shrinkage is reduced, but cement hydration rate decreases and strength is compromised
Solution Approach 1:
The patent combines graphene oxide, butyl acrylate, and silane into a composite emulsion system. The graphene oxide forms a three-dimensional network structure that provides mechanical reinforcement, while the butyl acrylate and silane components continue to provide anti-shrinkage effects through pore filling and hydrophobic coating, respectively. This composite approach allows the system to reduce drying shrinkage without compromising cement matrix strength, as the graphene oxide network compensates for any strength reduction caused by the other components.
Solution Approach 2:
The patent merges three distinct functional components into a single emulsion system: graphene oxide for structural reinforcement, butyl acrylate for pore filling and shrinkage reduction, and silane for hydrophobic coating and shrinkage reduction. By combining these components into one integrated solution, the patent achieves synergistic effects where the anti-shrinkage functionality is enhanced while the negative impact on strength is mitigated through the reinforcing graphene oxide network.
2Object-affected harmful factors
If butyl acrylate is used to form network polymer fibers, then shrinkage is limited, but film formation affects cement hydration rate
Solution Approach 1:
The patent applies butyl acrylate locally within the pore structures of the cement matrix rather than as a continuous film. The emulsion formulation allows butyl acrylate to concentrate and polymerize preferentially in pore regions, forming localized network polymer fibers that limit shrinkage without creating extensive continuous films that would impede cement hydration. This localized application reduces the negative impact on hydration rate while maintaining shrinkage control.
3Object-affected harmful factors
If silane forms hydrophobic coating, then water loss is reduced and shrinkage is decreased, but air permeability is maintained which may affect strength development
Solution Approach 1:
The patent combines silane's hydrophobic coating capability with graphene oxide's three-dimensional network structure. The graphene oxide network provides a rigid framework that compensates for any strength development issues that might arise from silane's air permeability maintenance. Meanwhile, the silane component continues to reduce water loss through hydrophobic coating, and the combined system achieves both shrinkage reduction and strength enhancement through the synergistic interaction between the graphene oxide framework and silane coating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite emulsion reduces drying shrinkage by 24% and increases compressive and flexural strength by 5% and 10% respectively, while maintaining the cement's hydration rate, thereby improving crack resistance and structural integrity.
Implementation Method 1
The graphene oxide has a relatively large specific surface area and surface oxygen-containing functional groups, which can provide growth sites for hydration products
Implementation Method 2
Butyl acrylate can also be dehydrated during cement hydration to form network polymer fibers to fill pores
Implementation Method 3
Silane materials (such as isobutyltriethoxysilane) are excellent concrete waterproofing materials that have a desirable permeability and an excellent waterproof effect
Implementation Method 4
With the water loss, a water level inside capillary tubes in the material drops, and the meniscus has an increased curvature, resulting in an increase in surface tension
Data Source
AI summary
The present disclosure provides use of a graphene oxide/butyl acrylate/silane composite emulsion as an anti-shrinkage agent of a cement-based material. In the present disclosure, active groups on an isobutyltriethoxysilane molecule reacts with hydroxyl groups on a surface of a mortar to form a layered hydrophobic structure, thereby slowing a water loss in the mortar of the cement-based material and avoiding cracking caused by drying shrinkage. Butyl acrylate can be dehydrated to form polymer fibers with a spatial network to fill pores of a cement paste, thereby limiting the shrinkage of the mortar. Graphene oxide has a relatively large specific surface area and oxygen-containing functional groups on a surface, which can provide growth sites for hydration products, and promote the hydration products to form a regular and dense structure in the form of a template, thus ensuring a strength of the cement-based material.