Multi-solid waste activated concrete using high-silicon iron ore tailings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The large-scale accumulation and environmental pollution caused by industrial solid waste in China, with existing technologies failing to effectively utilize and dispose of high volumes of waste materials, such as iron ore tailings, in concrete production.
Innovation Solution
Development of multi-solid waste activated concretes using high-silicon iron ore tailings, which incorporate fine pretreated waste stone and sand as aggregates, along with a modified ultrafine sand and specific chemical additives, to create a concrete with high solid waste admixing amounts, low cement consumption, improved impermeability, and enhanced compressive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large amounts of industrial solid waste are applied in concrete, then waste disposal effectiveness is improved, but concrete performance stability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the specific proportions of different waste materials (75-77% solid waste aggregates), optimizing particle size distribution and gradation parameters, and adjusting water-cement ratios to ensure concrete performance stability while maintaining high waste disposal effectiveness
Solution Approach 2:
The patent uses composite materials by combining multiple types of solid waste (iron ore tailings, waste stone, sand) with cement and chemical additives to create a composite concrete system that maintains performance stability while achieving high waste utilization rates
2Quantity of substance
If high-silicon iron ore tailings are used as ultrafine sand, then cement consumption is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the ultrafine sand of high-silicon iron ore tailings through chemical activation treatments, changing its physical and chemical properties to enable it to partially replace cement and reduce cement consumption
Solution Approach 2:
The patent uses chemical additives as intermediaries to activate the high-silicon iron ore tailings, facilitating their pozzolanic reaction capability and enabling them to function as partial cement replacement without requiring complex processing
3Adaptability or versatility
If waste stone and sand are used as aggregates, then resource utilization is improved, but concrete impermeability may deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the gradation parameters of waste stone and sand aggregates, controlling particle size distribution and packing density to minimize voids and maintain concrete impermeability while achieving high resource utilization
Solution Approach 2:
The patent applies local quality by ensuring that the waste aggregates meet specific local requirements for particle shape, surface texture, and grading in different zones of the concrete mixture to maintain overall impermeability while maximizing resource utilization
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 effectively replaces traditional aggregates with waste materials, optimizing gradation and particle characteristics to reduce cement consumption, enhance cohesive force, and improve concrete strength and durability, while promoting ecological sustainability by utilizing 75-77% solid waste aggregates and reducing environmental impact.
Implementation Method 1
mechanically activating by using an XQM-8 vertical planetary ball mill at an interval of forward and reverse rotation of 10-15 minutes and a rotating speed of 380-395 r/min for two hours
Implementation Method 2
By means of the pozzolanic activity of partial particles after the mechanical activation of the ultrafine sand of high-silicon iron ore tailings, CH enriched in the interfacial transition zone is consumed, more C—S—H is generated
Implementation Method 3
the additive includes a water reducing agent, a cellulose ether and dextrin, wherein the water reducing agent is a polycarboxylic acid water reducing agent
Data Source
AI summary
Multi-solid waste activated concretes with high-silicon iron ore tailings and preparation methods thereof are disclosed. In at least some embodiments, the concrete is prepared from raw materials including 360-380 kg/m3 of a cement, 30-40 kg/m3 of fly ash, 30-40 kg/m3 of a modified ultrafine sand of high-silicon iron ore tailings, 930-950 kg/m3 of a waste stone of tailings, 870-930 kg/m3 of a fine sand of tailings, 160-170 kg/m3 of water, and 4-8 kg/m3 of an additive.