Anti-corrosive Grouting Material for Coastal Structure Connection
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Solution Overview
Problem
Coastal structure connectors face premature failure due to marine corrosive environments, and existing grouting materials suffer from issues like slow or rapid setting, loss of fluidity, low early strength, and shrinkage after hardening, making it difficult to ensure anti-corrosion durability and rapid connection.
Innovation Solution
An anti-corrosive nano concrete grouting material is developed, comprising expansible compound cement, slag sand, fly ash, polyvinyl alcohol, graphene oxide, and specific admixtures, which is prepared through a method involving in-situ polymerization and intercalation to form GO-PVAH micro-capacitors that enhance corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grouting materials are used for coastal structure connection, then the connection function is achieved, but the material suffers from slow or rapid setting, loss of fluidity, low early strength, and shrinkage after hardening, making it difficult to ensure anti-corrosion durability
Solution Approach 1:
The patent modifies the chemical composition parameters of the grouting material by incorporating specific admixtures (corrosion inhibitor, early strength agent, fluidity agent, shrinkage agent) to change the setting time, strength development, and corrosion resistance characteristics of the cement-based matrix
Solution Approach 2:
The patent creates a composite grouting material system combining cement-based matrix with multiple functional admixtures and a corrosion-resistant coating layer, where each component contributes specific properties to achieve both rapid setting and long-term anti-corrosion durability
2Productivity
If the grouting sleeve is used to quickly connect coastal structures, then rapid connection is achieved, but it is difficult to ensure sufficient anti-corrosion durability while having good fluidity, early strength and high strength, as well as expansion without shrinkage
Solution Approach 1:
The patent applies a corrosion-resistant coating to the inner surface of the grouting sleeve before grouting, and incorporates corrosion inhibitors and protective admixtures into the grouting material in advance, so that the protective function is established before the grouting material is exposed to the corrosive marine environment
Solution Approach 2:
The patent develops a composite grouting system combining rapid-setting cement-based material with corrosion-resistant admixtures and a protective coating layer, enabling the material to simultaneously achieve rapid connection and long-term anti-corrosion durability in the marine environment
3Reliability
If conventional anti-seepage, anti-rust and anti-corrosion means are applied to the reinforcement sleeve, then some protection is achieved, but the narrow inner cavity makes these methods either impracticable or with poor use effect
Solution Approach 1:
The patent extracts the corrosion protection function from external coating methods and integrates it into the grouting material itself through incorporated corrosion inhibitors and protective admixtures, eliminating the need for separate coating applications in the narrow sleeve cavity
Solution Approach 2:
The grouting material provides self-protection against corrosion through incorporated corrosion inhibitors and protective admixtures that automatically activate when the material hardens, eliminating the need for external protection measures that would be difficult to apply in the narrow sleeve cavity
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 material achieves rapid connection and effective anti-corrosion durability, with improved chloride ion permeation resistance and seawater corrosion resistance, while maintaining early strength, high strength, and preventing shrinkage.
Implementation Method 1
a method involving in-situ polymerization and intercalation to form GO-PVAH micro-capacitors
Implementation Method 2
in-situ polymerization and intercalation to form GO-PVAH micro-capacitors
Implementation Method 3
1 part of expansible compound cement
Data Source
AI summary
An anti-corrosive concrete grouting material for coastal structure connection and a method for preparing the same, belonging to the technical field of anti-corrosion of coastal assembled structure connectors. The grouting material includes the following components: expansible compound cement, slag sand, fly ash (FA), polyvinyl alcohol (PVA) (containing an oxidant and a catalyst), graphene oxide (GO), a water reducer, an adjusting admixture, a defoaming agent, a mineral admixture and water. A shrinkage-free effect of the grouting material is realized through internal curing of GO-PVA hydrogel, micro-expansion of the compound cement and shrinkage reduction effect of the FA; an energy storage effect of a GO-PVA hydrogel micro-capacitor is exerted to avoid formation of a reinforcement corrosion micro-battery in a grouting material sleeve, a reinforcement corrosion self-immune effect is achieved, seawater corrosion resistance of the grouting material is improved by the slag sand, and it has huge economic and environmental protection benefits.