Solid Waste Aggregate Pipe Culverts With Rapid Ambient Curing
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Solution Overview
Problem
Conventional concrete pipe culvert production is inefficient due to long demolding times and high energy consumption from steam curing, with high carbon emissions and ecological impact from natural aggregate mining.
Innovation Solution
A lightweight aggregate-based non-steam-cured high-performance pipe culvert using low-carbon sulfur-aluminum-ferric cementitious material, solid waste-based aggregates, and ambient curing methods to achieve rapid strength development and reduced energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Portland cement and sand-gravel aggregates are used for pipe culvert production, then structural strength and durability are achieved, but demolding time is long (over 12 h), production efficiency is low, and steam curing consumes large amounts of energy
Solution Approach 1:
The patent changes the chemical composition parameters of the cementitious material from conventional Portland cement to sulfur-aluminum-ferric cementitious material with specific chemical composition (CaO: 35-45%, Al2O3: 15-25%, Fe2O3: 5-15%, SO3: 5-10%). This parameter change enables the material to achieve required strength without steam curing, eliminating energy consumption while maintaining structural performance
Solution Approach 2:
The patent uses composite cementitious material combining sulfur-aluminum-ferric cement with mineral admixtures (fly ash, slag, silica fume) in specific proportions. This composite approach enhances early strength development and allows ambient temperature curing, resolving the contradiction between achieving strength and reducing energy consumption
2Strength
If Portland cement is used as the main cementitious material, then structural strength is achieved, but carbon emissions and production costs are relatively high
Solution Approach 1:
The patent fundamentally changes the chemical composition of the cementitious material from calcium-based Portland cement to sulfur-aluminum-ferric based material. This parameter change reduces carbon emissions while maintaining strength through different hydration mechanisms that produce comparable mechanical properties
Solution Approach 2:
The patent discards conventional Portland cement and recovers/utilizes industrial by-products (fly ash, slag, silica fume) as mineral admixtures. This approach reduces carbon emissions by replacing high-carbon materials with low-carbon industrial waste materials while maintaining structural strength
3Strength
If natural sand and gravel aggregates are used, then concrete strength is achieved, but ecological environment is damaged due to mining and transportation costs increase
Solution Approach 1:
The patent discards natural sand and gravel aggregates that require mining and recovers/utilizes solid waste materials (construction debris, industrial by-products) as alternative aggregates. This approach eliminates ecological damage from mining while providing adequate structural performance through engineered waste materials
Solution Approach 2:
The patent converts harmful solid waste materials into beneficial construction aggregates. By treating waste materials as resources, the patent eliminates the need for natural aggregate mining, reduces ecological damage, and lowers transportation costs while maintaining concrete strength requirements
4Productivity
If conventional concrete mixing and pouring methods are used, then pipe culvert production is achieved, but demolding time is long resulting in low production efficiency
Solution Approach 1:
The patent changes the chemical composition parameters of the cementitious material to enable rapid early strength development. The sulfur-aluminum-ferric based material with specific composition achieves sufficient demolding strength much faster than conventional Portland cement, reducing demolding time from over 12 hours to significantly shorter periods
Solution Approach 2:
The patent incorporates mineral admixtures (fly ash, slag, silica fume) in advance into the cementitious material composition to enhance early strength development. This preliminary preparation of the material composition enables faster strength gain and shorter demolding time without requiring additional curing processes
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 results in a pipe culvert with high strength, short demolding time, and low production costs, utilizing over 80% solid waste and meeting durability standards without steam curing.
Implementation Method 1
300-450 kg/m³ of a low-carbon sulfur-aluminum-ferric cementitious material
Data Source
AI summary
A lightweight aggregate-based non-steam-cured high-performance pipe culvert and a preparation method thereof. The lightweight aggregate-based non-steam-cured high-performance pipe culvert is prepared from a raw material including the following components by mass per unit volume: 300-450 kg/m3 of a low-carbon sulfur-aluminum-ferric cementitious material; 800-920 kg/m3 of a solid waste-based lightweight aggregate; 300-550 kg/m3 of a solid waste-based artificial sand; 0-100 kg/m3 of a mineral admixture; 0-50 kg/m3 of an auxiliary material; and 110-160 kg/m3 of water; and the lightweight aggregate-based non-steam-cured high-performance pipe culvert further includes a water reducer and a retarder. The lightweight aggregate-based non-steam-cured high-performance pipe culvert of the present invention can be demolded within 4 hours during forming, with short demolding time and no need for steam curing, resulting in a low production cost and high production efficiency. The obtained product has high strength, good impermeability and durability, and can utilize solid waste in a high proportion.