Deoiled Oil Shale Waste Residue Concrete Aggregates
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Solution Overview
Problem
Oil shale waste residue, rich in SiO2 and Al2O3, is typically disposed of in landfills, causing environmental issues and has low 28d compressive strength when used in concrete, making it unsuitable for practical applications due to its low energy consumption and poor performance.
Innovation Solution
The use of deoiled oil shale waste residue as aggregates in concrete, treated with biosurfactants like sophorolipid or Polysorbate 80 (Tween 80) to remove shale oil, forming calcium silicate compounds that enhance strength, replacing fine and coarse aggregates, and improving the concrete's mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If oil shale waste residue is used as aggregates in concrete, then resource utilization is improved and environmental impact is reduced, but the compressive strength of concrete deteriorates to below 5 MPa
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the oil shale waste residue through controlled acid leaching. Specifically, it adjusts the leaching time, acid concentration, and temperature to optimize the removal of harmful components while preserving the structural integrity and strength-forming potential of the residue, thereby transforming it into a viable aggregate material with sufficient compressive strength
Solution Approach 2:
The patent introduces an intermediary substance (acid leaching agent) to mediate between the oil shale waste residue and the concrete matrix. This intermediary process removes detrimental components and creates a more compatible interface between the aggregate and cement paste, enabling the weak residue material to function effectively as a structural aggregate without directly compromising concrete strength
2Object-affected harmful factors
If oil shale waste residue is disposed of in landfill, then environmental pollution is reduced, but land resources are consumed and cityscape is affected
Solution Approach 1:
The patent converts the harmful oil shale waste residue into a beneficial building material through chemical leaching treatment. The waste residue, which would otherwise pollute the environment and occupy land, is transformed into treated aggregates that can be used in concrete production, thereby eliminating the need for landfill disposal and turning an environmental liability into a resource
Solution Approach 2:
The treated oil shale waste residue serves multiple functions: it acts as both fine and coarse aggregates in concrete, providing structural skeleton while also contributing to the overall volume and workability of the mixture. This multi-functionality allows complete replacement of traditional aggregates, maximizing resource utilization efficiency
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 7-day compressive strength of concrete with deoiled oil shale waste residue reaches 36.2 MPa, meeting practical application requirements and enabling full replacement of traditional aggregates, reducing resource consumption and environmental impact.
Implementation Method 1
adding a degreasing agent into the oil shale waste residue, conducting hot washing and standing to obtain the deoiled oil shale waste residue
Implementation Method 2
the sophorolipid or Polysorbate 80 (Tween 80) gives better adsorption and formation of oil film
Implementation Method 3
forming calcium silicate compounds that enhance strength
Data Source
AI summary
A concrete with oil shale waste residue as aggregates and a preparation method thereof are provided by the present disclosure, belonging to the technical field of concrete. Oil shale waste residue is used to partially or completely replace the fine aggregates and coarse aggregates in the concrete, where the oil shale waste residue is deoiled oil shale waste residue. The oil shale waste residue is subjected to oil removal treatment and applied to the preparation of concrete.