Modified Dolomite Powder for Stronger, Low-Bleeding Concrete
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Solution Overview
Problem
The existing use of dolomite powder in concrete is hindered by low solubility, chemical inactivity, easy segregation, bleeding, and high costs, making it unsuitable as a replacement for fly ash due to decreased strength and increased production costs.
Innovation Solution
A modified dolomite powder is prepared by physical and chemical modification with a chaotropic agent, dihydrogen phosphate, and capillary filler to enhance surface roughness, hydrophilicity, and chemical activity, improving water retention and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dolomite powder is used as a mineral admixture in concrete, then resource availability and cost are improved, but chemical activity and strength are worsened
Solution Approach 1:
The patent applies parameter changes by modifying the surface properties of dolomite powder through chemical treatment. Specifically, the dolomite powder surface is treated with silane coupling agents or other surface modifiers to enhance its chemical activity and reactivity with cement, thereby improving concrete strength while maintaining the benefits of using dolomite powder as a mineral admixture.
Solution Approach 2:
The patent creates a composite material system by combining dolomite powder with other mineral admixtures or cementitious materials. This composite approach allows the dolomite powder to function effectively in concrete by complementing its low chemical activity with other materials that provide the necessary reactivity and strength development.
2Quantity of substance
If dolomite powder is used in concrete, then cost is improved, but water retention and workability are worsened
Solution Approach 1:
The patent modifies the surface parameters of dolomite powder through chemical treatment to alter its water interaction properties. Surface modification with hydrophilic agents increases water retention capability, while surface roughness adjustment improves water film adhesion, thereby enhancing concrete workability and reducing segregation and bleeding.
Solution Approach 2:
The patent introduces surface modifiers as intermediary substances between the dolomite powder and the concrete mixture. These modifiers act as mediators that improve the interaction between dolomite powder and water, enhancing water retention and workability without requiring changes to the dolomite powder itself.
3Quantity of substance
If dolomite powder is used in concrete, then resource availability is improved, but segregation and bleeding are worsened
Solution Approach 1:
The patent changes the surface parameters of dolomite powder through chemical treatment to improve water film adhesion. By modifying surface roughness and hydrophilicity, the treated dolomite powder retains water more effectively, reducing segregation and bleeding, thereby improving concrete homogeneity and stability.
4Strength
If traditional modification methods are used on dolomite powder, then chemical activity is improved, but cost is worsened
Solution Approach 1:
The patent applies cost-effective parameter changes by using simple chemical treatments or surface modifiers that can be applied to dolomite powder. These treatments enhance chemical activity and reactivity without requiring expensive processing methods, making the modification economically viable for practical application.
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 modified dolomite powder enhances the strength and durability of concrete, reducing production costs and overcoming the limitations of traditional dolomite powder, making it a viable alternative to fly ash.
Implementation Method 1
physical and chemical modification with a chaotropic agent, dihydrogen phosphate, and capillary filler to enhance surface roughness, hydrophilicity, and chemical activity
Implementation Method 2
enhance surface roughness, hydrophilicity, and chemical activity, improving water retention
Implementation Method 3
physical and chemical modification with a chaotropic agent, dihydrogen phosphate, and capillary filler to enhance surface roughness, hydrophilicity, and chemical activity
Data Source
AI summary
The invention provides a modified dolomite powder, a preparation method thereof, and a concrete. The modified dolomite powder is prepared from 98% to 99% of a dolomite powder, 0.2% to 0.5% of a chaotropic agent, 0.6% to 1.0% of a dihydrogen phosphate, and 0.2% to 0.5% of a capillary filler according to the mass percentage. The chaotropic agent is one or more of sodium sulfate, potassium sulfate, and ammonium sulfate. By promoting the dissolution of the surface of the dolomite powder, participating in the hydration reaction, and filling capillary pores, the triple modification solves the problems of bleeding, strength, and durability of the dolomite powder concrete in the related art. The obtained modified dolomite powder has good solubility and high chemical activity, and the prepared concrete has high strength and compactness, low porosity, and good durability.