PERVIOUS CONCRETE GREEN UNI PAVERS WITH GRANITE WASTE POWDER AS CEMENT REPLACEMENT

Abstract

The invention relates to the development of pervious concrete uni pavers that utilize granite waste powder as a partial replacement for cement, providing an eco-friendly and sustainable solution for urban infrastructure. The proposed pavers are designed to address the environmental challenges associated with cement production and granite waste disposal, while offering effective stormwater management through high permeability. These pervious concrete pavers are composed of a carefully balanced mixture of coarse aggregates, granite waste powder, and water, with minimal or no fine aggregates to maintain porosity. The granite waste powder replaces a portion of the cement, typically ranging from 10% to 30% by weight, thereby reducing the overall carbon footprint of the paver production process. The use of granite waste powder not only reduces cement consumption but also enhances the mechanical properties of the pavers, such as compressive strength and durability. The pavers are characterized by their ability to allow water to permeate through the surface, significantly reducing surface runoff and promoting groundwater recharge in urban environments. This feature makes them particularly suitable for applications in parking lots, sidewalks, driveways, and public spaces, where stormwater management is critical. The invention's key benefits include environmental sustainability through waste utilization, reduced cement usage, improved stormwater management, and the production of durable, high-strength pavers that contribute to the longevity of urban infrastructure. Additionally, the process of manufacturing these pavers is cost-effective and scalable, making it a viable option for widespread implementation in both residential and commercial projects.

Specification

Description:Field of the invention
The invention relates to the field of sustainable construction materials, specifically to the development of pervious concrete pavers. These pavers incorporate granite waste powder as a partial replacement for cement, providing an eco-friendly solution for paving in urban areas while promoting sustainable waste management.

SUMMARY
The invention provides a method for producing pervious concrete uni pavers by incorporating granite waste powder as a partial replacement for cement. The resulting pavers are environmentally friendly, reduce the carbon footprint of construction, and effectively manage stormwater. These pavers are suitable for various applications, including parking lots, sidewalks, and other urban infrastructure where sustainable materials are required.
The use of granite waste powder not only reduces the consumption of cement, which is energy-intensive to produce, but also provides a productive use for granite waste that would otherwise contribute to environmental degradation.
1. Purpose of the Invention
The primary purpose of this invention is to create a construction material that addresses two significant environmental challenges: the high carbon footprint of cement production and the disposal of granite waste from the stone industry. By incorporating granite waste powder as a partial replacement for cement, the invention not only reduces the environmental impact of paver production but also offers an efficient solution for managing stormwater in urban areas.
2. Composition of the Pervious Concrete Pavers
The pervious concrete pavers are composed of the following key materials:
Granite Waste Powder: This byproduct from the granite industry is used as a partial replacement for cement, typically substituting 10% to 30% of the cement by weight. The fine particle size of the granite waste powder enhances the bonding properties within the cementitious matrix and contributes to the overall strength and durability of the pavers.
Cement: While reduced, cement remains a crucial component of the mix, providing the necessary binding properties to form a solid structure.
Coarse Aggregate: Crushed stone or gravel, ranging from 6 mm to 12 mm in size, is used to maintain the structural integrity and porosity of the pavers. The size and distribution of these aggregates ensure that the pavers are permeable, allowing water to pass through the surface.
Water and Admixtures: Water is added to hydrate the cementitious materials, and admixtures such as water-reducing agents may be used to improve workability and mechanical properties. In some cases, air-entraining agents are included to enhance freeze-thaw resistance.
3. Manufacturing Process
The manufacturing process for the pervious concrete pavers involves several steps:
Material Preparation: Granite waste powder is processed to achieve a fine consistency, and coarse aggregates are sorted and cleaned.
Mixing: The dry ingredients, including granite waste powder, cement, and coarse aggregates, are first mixed to ensure uniformity. Water and any required admixtures are then added gradually, and the mixture is blended until it reaches a homogeneous consistency.
Molding: The wet concrete mix is poured into molds shaped to the desired paver dimensions. The molds are vibrated to eliminate air pockets and ensure compaction.
Curing: The pavers are cured through methods such as steam curing, water curing, or the application of curing compounds, which are critical for achieving the necessary strength and durability.
Finishing: After curing, the pavers undergo finishing processes to remove rough edges and achieve the desired surface texture. They may also be treated with sealants to further enhance durability.
4. Performance Characteristics
The pervious concrete pavers are designed to offer the following performance characteristics:
High Permeability: The pavers allow water to pass through at a specified rate, significantly reducing surface runoff and promoting groundwater recharge. This is particularly beneficial in urban areas where impermeable surfaces often lead to flooding and water management issues.
Compressive Strength: The pavers achieve a compressive strength of 15 MPa to 25 MPa, making them suitable for light to moderate traffic loads. The strength can be adjusted based on the specific mix design and curing process.
Durability: The use of granite waste powder improves the durability of the pavers, providing resistance to wear, freeze-thaw cycles, and chemical attack. This ensures a long service life with minimal maintenance.
Environmental Benefits: By replacing a portion of cement with granite waste powder, the invention reduces the carbon footprint associated with paver production. Additionally, it provides a sustainable solution for managing granite waste, which would otherwise contribute to environmental pollution.
5. Applications
These pervious concrete pavers are ideal for a range of applications in urban environments:
Parking Lots: The pavers can be used to create permeable parking surfaces that help manage stormwater and reduce the heat island effect.
Sidewalks and Walkways: The pavers provide safe, permeable surfaces for pedestrians, minimizing puddling and reducing slip hazards.
Driveways: Suitable for residential and commercial use, these pavers offer a sustainable alternative to traditional, impermeable driveway surfaces.
Public Spaces: The pavers are ideal for parks, plazas, and other public areas where sustainability and stormwater management are priorities.
6. Advantages of the Invention
Sustainability: The invention promotes sustainable construction practices by utilizing granite waste powder and reducing cement consumption, leading to lower CO2 emissions and effective waste management.
Stormwater Management: The high permeability of the pavers ensures effective stormwater management, reducing the risk of flooding and promoting groundwater recharge.
Durability and Strength: The pavers offer a balance of strength and durability, making them suitable for various applications in urban infrastructure.
Cost-Effectiveness: The use of granite waste, which is typically a low-cost or waste material, reduces the overall material costs, making the production of these pavers economically viable.
7. Industrial Applicability
The invention has wide industrial applicability, particularly in the construction and urban development sectors. It provides a green alternative to traditional concrete pavers, aligning with global trends toward sustainable development and green building practices. The scalability of the manufacturing process and the widespread availability of granite waste make this invention suitable for large-scale implementation across various projects.
DETAILED DESCRIPTION
a. Composition of Pervious Concrete Pavers
• Cement Replacement:
o Granite Waste Powder: The invention uses granite waste powder as a partial replacement for cement in the concrete mix. The replacement percentage can vary depending on the specific application and desired properties of the pavers, typically ranging from 10% to 30% by weight of the cement content.
o Benefits: The use of granite waste powder reduces the reliance on cement, lowering the carbon footprint of the pavers. Additionally, granite waste powder enhances the durability and strength of the pavers due to its fine particle size and pozzolanic properties.
• Aggregate:
o Coarse Aggregate: The pervious concrete mix uses a coarse aggregate, typically crushed stone or gravel, with a size range of 6mm to 12mm. This aggregate size ensures the porosity of the concrete, allowing water to pass through the pavers.
o Fine Aggregate: Fine aggregate is minimized or excluded to maintain the porosity of the concrete. If used, it is typically a small percentage and consists of sand with a particle size less than 4.75mm.
• Admixtures:
o Water-Reducing Agents: Chemical admixtures may be added to reduce the water content in the mix while maintaining workability. This improves the strength and durability of the pavers.
o Air-Entraining Agents: These may be used to enhance the freeze-thaw resistance of the pavers, particularly in colder climates.
• Water-Cement Ratio:
o The water-cement ratio is carefully controlled to ensure sufficient hydration of the cementitious materials while maintaining the desired porosity of the pavers. A typical ratio ranges from 0.28 to 0.35.



b. Manufacturing Process
1. Material Preparation:
o Granite waste powder is collected, processed to remove impurities, and ground to a fine consistency. The coarse aggregate is cleaned and sorted to the desired size range.
2. Mixing:
o The granite waste powder, cement, and aggregates are dry-mixed to ensure uniform distribution of the materials. Water and admixtures are then added, and the mix is blended until a homogeneous consistency is achieved.
3. Molding:
o The mixed concrete is poured into molds of the desired shape and size for the uni pavers. The molds are vibrated to remove air pockets and ensure compaction.
4. Curing:
o The pavers are removed from the molds and cured in a controlled environment to achieve the required strength. Curing methods may include steam curing, water curing, or the use of curing compounds.
5. Finishing:
o After curing, the pavers are finished by removing any rough edges and ensuring uniform surface texture. The pavers may also be treated with a sealant to enhance durability.


c. Performance Characteristics
• Permeability:
o The pervious concrete pavers allow water to pass through the surface at a rate of several liters per minute per square meter, depending on the aggregate size and porosity of the mix. This characteristic is crucial for reducing surface runoff and promoting groundwater recharge in urban areas.
• Compressive Strength:
o The pavers achieve a compressive strength suitable for pedestrian and light vehicle traffic, typically in the range of 15 MPa to 25 MPa, depending on the mix design and curing process.
• Durability:
o The use of granite waste powder enhances the durability of the pavers, providing resistance to wear, freeze-thaw cycles, and chemical attack. The pavers are expected to have a long service life with minimal maintenance.
• Environmental Impact:
o The incorporation of granite waste powder significantly reduces the environmental impact of the pavers by minimizing cement usage and repurposing industrial waste. This contributes to sustainable construction practices and aligns with green building standards.



d. Applications
• The pervious concrete green uni pavers are ideal for a variety of applications, including:
o Parking Lots: The pavers can be used in parking areas to manage stormwater and reduce the heat island effect.
o Sidewalks and Walkways: The pavers provide a permeable surface for pedestrian areas, reducing puddling and improving safety.
o Driveways: The pavers can be used in residential and commercial driveways, offering a sustainable alternative to traditional impermeable surfaces.
o Public Spaces: The pavers are suitable for use in parks, plazas, and other public spaces where environmental sustainability is a priority.
, Claims:I/We Claim:
• Claim 1: A pervious concrete uni paver comprising a mixture of coarse aggregate, granite waste powder as a partial replacement for cement, and water, wherein the paver is characterized by its permeability, compressive strength, and durability.
• Claim 2: The paver of claim 1, wherein the granite waste powder replaces 10% to 30% of the cement by weight.
• Claim 3: The paver of claim 1, wherein the permeability allows for a water infiltration rate of X liters per minute per square meter.
• Claim 4: The paver of claim 1, wherein the compressive strength ranges from 15 MPa to 25 MPa.

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