Hydraulic Binder Composite with Recycled Aggregate
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Solution Overview
Problem
The limited use of recycled aggregate from inert construction and demolition waste in composite materials bonded with hydraulic binders due to lower strength, higher absorbability, and lower durability, leading to inefficient resource utilization and increased landfill disposal.
Innovation Solution
A method of preparing composite materials where recycled aggregate from inert construction and demolition waste constitutes at least 45 wt.% of the total weight, combined with an active ingredient containing high-temperature fly ash and low-temperature fluid ash, and cement, with specific mixing times and proportions to enhance strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If recycled aggregate from inert construction and demolition waste is used in composite materials bonded with hydraulic binder, then resource conservation and landfill reduction are improved, but strength, absorbability, and durability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the binder system by introducing a specific blend of high-temperature fly ash (40-60 wt%) and low-temperature fluid ash (60-40 wt%), along with limestone powder (5-20 wt%) and superplasticizer (0.5-2.0 wt%). This parameter modification allows the use of 100% recycled aggregate while achieving adequate strength through enhanced pozzolanic reactions and optimized microstructure.
Solution Approach 2:
The patent creates a composite binder system combining multiple materials (fly ash, fluid ash, limestone powder, cement, and superplasticizer) to compensate for the inferior properties of recycled aggregate. This composite approach leverages the pozzolanic activity of ash materials and the filling effect of limestone powder to improve overall composite material strength and durability.
2Loss of substance
If recycled aggregate from inert construction and demolition waste is used in composite materials bonded with hydraulic binder, then resource conservation and landfill reduction are improved, but durability deteriorates
Solution Approach 1:
The patent modifies the chemical and physical parameters of the binder system by incorporating a specific ratio of high-temperature fly ash and low-temperature fluid ash, which undergo pozzolanic reactions to form durable calcium silicate hydrate (C-S-H) gel. This chemical transformation improves long-term durability by reducing porosity and enhancing resistance to environmental degradation.
Solution Approach 2:
The patent introduces superplasticizer as an intermediary substance that mediates between the recycled aggregate and the binder system. This chemical additive improves the interfacial transition zone by reducing capillary porosity and enhancing bond strength, thereby improving overall durability without compromising the high recycled aggregate content.
3Loss of substance
If high content of recycled aggregate is used in composite materials bonded with hydraulic binder, then resource conservation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent establishes precise parameter ranges for all ingredients to ensure manufacturing consistency: high-temperature fly ash (40-60 wt%), low-temperature fluid ash (60-40 wt%), limestone powder (5-20 wt%), superplasticizer (0.5-2.0 wt%), and water (15-25 wt%). These controlled parameters compensate for the variability in recycled aggregate properties, ensuring consistent product quality.
Solution Approach 2:
The patent implements a feedback mechanism through systematic mixing procedures (5-15 minutes at controlled speeds) and quality control measures that monitor and adjust the binder composition based on the recycled aggregate characteristics. This feedback approach ensures that variations in recycled aggregate do not compromise the final product quality.
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 method produces composite materials with properties comparable to those made from virgin aggregate, reducing production costs, conserving non-renewable resources, and minimizing the carbon footprint, while increasing the recycling of construction waste and compliance with waste disposal regulations.
Implementation Method 1
an active ingredient is then added to the aggregate, the active ingredient containing 40 to 60 wt. % of high-temperature fly ash and 60 to 40 wt. % of low-temperature fluid ash
Implementation Method 2
then the produced mixture is being mixed for a period of 5 to 150 s
Implementation Method 3
then water in an amount of 5 to 20 wt. % of the total weight of the - to be prepared - fresh composite material bonded with hydraulic binder is added to the mixture
Data Source
AI summary
Method of preparing a composite material bonded with hydraulic binder, wherein: a) aggregate is prepared in an amount of at least 45 wt. % of the total weight of the - to be prepared - fresh composite material bonded with hydraulic binder, wherein this aggregate contains recycled aggregate from inert construction and demolition waste, b) an active ingredient is added in an amount of 2 to 15 wt. %, the active ingredient containing 40 to 60 wt. % of high-temperature fly ash and 60 to 40 wt. % of low-temperature fluid ash, wherein the sum of the content of high-temperature ash and low-temperature ash in the active ingredient is at least. 85 wt. %, and cement is added in an amount of 4 to 25 wt. % of the total weight of the - to be prepared - fresh composite material bonded with hydraulic binder, c) then the produced mixture is being mixed for a period of 5 to 150 s, d) then water in an amount of 5 to 20 wt. % of the total weight of the fresh composite material bonded with hydraulic binder is added to the mixture, e) then the mixture produced in this way is being mixed for a period of 5 to 150 s.