Reduced-Carbon Portland Cement Slabs for Carbon Credit Exchange

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Solution Overview

Problem

The production of Portland cement concrete (PCC) slabs-on-ground (SoGs) results in high carbon dioxide emissions due to the excessive use of cement, which is necessary to meet conservative thickness design criteria, contributing to environmental and financial costs.

Innovation Solution

A method and system for fabricating PCC SoGs with a nominal thickness of 7 inches or less, reducing cement usage by 1 inch compared to traditional designs, while ensuring performance criteria are met through proof rolling and site preparation, and documenting carbon emission savings for carbon credits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conservative thickness design guidelines (ACI) are followed to guarantee performance, then reliability is improved, but quantity of substance (cement usage) increases

Engineering Contradiction:
Improveperformance guaranteeVSAvoidcement usage
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the thickness parameter from the conservative ACI guidelines (8-10 inches) to an optimized thickness (7 inches or less), achieving both performance satisfaction and reduced cement consumption. This parameter optimization allows the slab to meet load and cracking resistance requirements while using less material.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies partial action by using slightly less cement than the conservative design would require (7 inches instead of 8-10 inches), while still achieving the necessary performance through improved mix designs and construction methods. This partial reduction in material quantity leads to significant carbon emission reductions.

Inventive Principle:
Principle #16Partial or excessive action

2Reliability

If excessive cement is used to meet conservative design criteria, then reliability is improved, but object-generated harmful factors (carbon dioxide emissions) increase

Engineering Contradiction:
Improveperformance guaranteeVSAvoidcarbon dioxide emissions
Core Design Contradiction:
ReliabilityVSObject-generated harmful factors

Solution Approach 1:

By optimizing the thickness parameter to 7 inches or less while maintaining performance through improved engineering methods, the patent directly reduces the quantity of cement produced and thus the carbon dioxide emissions associated with cement manufacturing, which contributes to global warming.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of cement production (high carbon emissions) into a benefit by demonstrating that less cement is needed to achieve the same performance. The optimized design proves that reduced cement usage does not compromise reliability, thereby turning the previously harmful excessive cement production into a beneficial reduced-emission approach.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

3Quantity of substance

If reduced thickness is used to reduce carbon emissions, then quantity of substance is reduced, but reliability may be compromised

Engineering Contradiction:
Improvecement usageVSAvoidperformance criteria
Core Design Contradiction:
Quantity of substanceVSReliability

Solution Approach 1:

The patent changes the thickness parameter to 7 inches or less while compensating for the reduced material quantity through optimized concrete mix designs, improved construction methods, and enhanced site preparation techniques, thereby maintaining reliability despite lower cement usage.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material approaches by optimizing the concrete mix composition and incorporating supplementary cementing materials alongside traditional portland cement, allowing reduced overall cement content while maintaining the required strength and durability performance criteria.

Inventive Principle:
Principle #40Composite materials

Data Source

PatentUS12104336B1Carbon credit exchange system and method for reduced-carbon-emission portland cement concrete slabs-on-ground
Publication Date: 2024.10.01 AXIOM CARBON INDEX LLC
  • US12104336B1 patent drawing
  • US12104336B1 patent drawing
  • US12104336B1 patent drawing

AI summary

A building constructed with a reduced-carbon-emission portland cement concrete slab-on-ground (PCC SoG) having a nominal thickness that is less than a PCC SoG design for the ground site having a design thickness based on design guidelines set forth by the American Concrete Institute. Carbon emission savings for the reduced-carbon-emission PCC SoG and a video record of the surface of the ground site prior to construction of the reduced-carbon-emission PCC SoG are stored by a processor in a first database. The processor verifies that the building constructed with the reduced-carbon-emission PCC SoG has been completed. The processor transfers at least a portion of the carbon emission savings and the video record stored in the first database to a second database in preparation for the sale or exchange of the carbon emission savings only after the processor verifies that the building constructed with the reduced-carbon-emission PCC SoG has been completed.