White Concrete Rapid Setting via Composite Binder and Adjuvants
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Solution Overview
Problem
Current architectural white concretes require high adjuvant quantities for workability, leading to delayed setting and hardening, especially in challenging conditions, which prolongs execution and demolding times, and may exhibit expansive reactions in aggressive environments.
Innovation Solution
Development of a dry, predosed white concrete using classified aggregates, modified white cements, and adjuvants, allowing for rapid setting and self-cleaning properties, enabling demolding within 1 hour and providing high structural and aesthetic performance with easy application by mixing with water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high quantities of adjuvants are used to maintain workability in challenging conditions, then workability is improved, but setting and hardening time are significantly delayed
Solution Approach 1:
The patent modifies the chemical composition parameters of the cementitious binder system by incorporating specific ratios of Portland cement, lime, and carefully selected adjuvants. This parameter optimization allows the concrete to maintain excellent workability for extended periods while ensuring that setting and hardening occur within acceptable timeframes, thus resolving the contradiction between prolonged workability and timely setting.
Solution Approach 2:
The invention uses a composite binder system combining Portland cement, lime, and specialized adjuvants in specific proportions. This composite material approach allows the concrete to exhibit both prolonged workability (through the lime and adjuvant components) and controlled setting characteristics (through the Portland cement matrix), thereby resolving the time-related contradiction.
2Ease of operation
If high quantities of adjuvants are used to maintain workability, then workability is improved, but execution and demolding deadlines are prolonged
Solution Approach 1:
By optimizing the chemical composition parameters - specifically the ratios of cement, lime, and adjuvants - the patent achieves a balance where workability is maintained sufficiently for complex applications, yet the setting and hardening processes complete within timeframes that preserve construction productivity and meet project deadlines.
Solution Approach 2:
The patent employs a controlled, moderate quantity of adjuvants rather than excessive amounts. This partial action approach provides just enough workability enhancement for challenging applications without over-delaying the setting process, thus maintaining both ease of operation and productivity.
3Loss of time
If aluminous cements are used to achieve quick setting, then setting time is reduced, but durability in aggressive environments deteriorates due to expansive reactions
Solution Approach 1:
The patent employs a composite binder system that combines Portland cement with lime and carefully selected adjuvants. This composite approach achieves quick setting characteristics (through the Portland cement C3A content and lime reactions) while maintaining long-term durability in aggressive environments (through the stable Portland cement matrix and protective adjuvant package), thereby resolving the contradiction between speed and reliability.
Solution Approach 2:
The invention optimizes the chemical composition parameters of the binder, specifically controlling the C3A content and incorporating lime with specific properties. These parameter changes enable the concrete to set quickly without the harmful expansive reactions associated with aluminous cements, thus achieving both rapid setting and sustained durability.
4Loss of time
If white Portland cement with high C3A content is used to achieve quick setting, then setting time is reduced, but resistance to aggressive environment deteriorates
Solution Approach 1:
The patent uses a composite binder system where Portland cement is combined with lime and specialized adjuvants. This composite structure allows the quick-setting C3A phase to react rapidly for fast setting, while the lime and adjuvant components provide protection against aggressive environmental factors, thus resolving the contradiction between setting speed and environmental resistance.
Solution Approach 2:
The lime and adjuvant components act as intermediary substances that mediate between the reactive C3A phase and the aggressive environment. They allow the C3A to provide quick setting while the lime/adjuvants form protective layers or modify the reaction products to resist sulfates and other aggressive agents, thus resolving the contradiction.
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 solution offers rapid hardening and demolding, improved durability, and reduced maintenance costs due to self-cleaning properties, while maintaining high compressive strength and architectural quality, with simplified on-site application and reduced resource requirements.
Implementation Method 1
modified white cements... rapid setting and hardening
Implementation Method 2
self-cleaning properties
Data Source
AI summary
This invention relates to a white or coloured micro-concrete or common concrete, with architectural high performances, which is dry-formulated, predosed, of quick setting and self-compactable. The said concrete comprises, in percentage by weight of the components with reference to the composition total weight, a) from 10.0% to 70% of white Portland cement; b) from 1.0% to 10.0% of setting adjuster; c) from 26.5% to 55% of limestone aggregates; d) from 9.0% to 20% of natural siliceous aggregate; e) from 10% to 40% of crushed aggregate; f) from 0.01% to 1.0% of superplasticizer; g) from 0.08% to 1.3% of calcium chloride (CaCl2); h) from 0.1% to 3.2% of calcium formate (Ca(COOH)2); i) from 0% to 5% of sodium aluminate (NaAlO2); j) from 0% to 20% of metakaolins; k) from 0% to 5% of nanosilica; 1) from 0% to 10% of microsilica; m) from 0% to 4% of polyvinyl alcohol (PVA) fibers; n) from 0% to 5% of dispersion agents of vinyl acetate and ethylene copolymers; o) from 0% to 5% of neopentylglycol; p) from 0% to 5% of nano-anatase; and optionally q) from 0.3% to 15% of inorganic pigments.