The Low-Carbon Concrete Guide: Materials

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Title: The Low-Carbon Concrete Guide: Materials

Author(s): Mary Christiansen, Ph.D., LEED AP

Publication: Technical Documents

Volume:

Issue:

Appears on pages(s): 261

Keywords: low-carbon concrete; mixture design; carbon footprint of concrete; portland cement; global warming potential (GWP);embodied carbon; life cycle thinking, environmental product declaration (EPD); life cycle analysis (LCA); product category rule (PCR); susta

DOI: 10.14359/51749334

Date: 11/20/2025

Abstract:
This guide offers a clear, evidence-based foundation for understanding the materials and mixture decisions that influence the carbon footprint of concrete. Focusing on the upstream stages of production, where specification choices most affect embodied carbon, it aims to help engineers, designers, contractors, and policymakers evaluate low-carbon options while maintaining the safety, strength, and durability of traditional concrete. The guide examines concrete’s role in global carbon emissions, life-cycle thinking and carbon quantification tools, and a full spectrum of binder-level strategies, including SCMs, mineral fillers, blended cements, low-carbon portland cements, and alternative cements. It also introduces aggregate, reinforcement, and water-level pathways, along with supporting concepts such as mixture optimization and durability, and advanced concrete technologies to illustrate how material choices interact with long-term performance. Designed to be accessible to newcomers yet valuable to experienced practitioners, this guide provides the context, background, and technical framework needed to understand low-carbon concrete materials and their implications for performance and sustainability.

Related References:

ACI SPEC-301-16: Specifications for Structural Concrete

ACI CODE-318-25: Building Code for Structural Concrete—Code Requirements and Commentary

ACI CODE-323-24: Low-Carbon Concrete—Code Requirements and Commentary

ACI CODE-562-25: Assessment, Repair, and Rehabilitation of Existing Concrete Structures—Code Requirements and Commentary

ACI PRC-130-19: Report on the Role of Materials in Sustainable Concrete Construction

ACI PRC-130.1-25: Environmental Product Declarations (EPDs) of Cement-Based Products: State of Practice and Path Forward—TechNote

ACI PRC-201.2-23: Durable Concrete—Guide

ACI PRC-211.1-22: Selecting Proportions for Normal-Density and High Density-Concrete—Guide

ACI PRC-212.3-16: Report on Chemical Admixtures for Concrete

ACI PRC-213-14: Guide for Structural Lightweight-Aggregate Concrete (Reapproved 2023)

ACI PRC-222-19: Guide to Protection of Metals in Concrete Against Corrosion

ACI PRC-222.2-14: Report on Corrosion of Prestressing Steels

ACI PRC-232.1-12: Report on the Use of Raw or Processed Natural Pozzolans in Concrete

ACI PRC-232.2-18: Report on the Use of Fly Ash in Concrete

ACI PRC-232.3-14: Report on High-Volume Fly Ash Concrete for Structural Applications

ACI PRC-232.5-21: Harvested Fly Ash as a Supplementary Cementitious Material—TechNote

ACI PRC-233-17: Guide to the Use of Slag Cement in Concrete and Mortar

ACI PRC-234-06: Guide for the Use of Silica Fume in Concrete (Reapproved 2012)

ACI PRC-237-07: Self-Consolidating Concrete (Reapproved 2019)

ACI PRC-239-18: Ultra-High Performance Concrete: An Emerging Technology Report

ACI PRC-239.1-24: What is Ultra-High-Performance Concrete (UHPC)?—TechNote

ACI PRC-242-22: Alkali-Activated Cements—Report

ACI PRC-304-00: Guide for Measuring, Mixing, Transporting, and Placing Concrete (Reapproved 2009)

ACI PRC-308-16: Guide to External Curing of Concrete

ACI PRC-327-24: Roller-Compacted Concrete Pavements—Guide

ACI PRC-363-10: Report on High-Strength Concrete

ACI PRC-439.6R-19: Guide for the use of ASTM A1035/A1035M Type CS Grade 100 (690) Steel Bars for Structural Concrete

ACI PRC-440-07: Report on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures

ACI PRC-440.1-15: Guide for the Design and Construction of Structural Concrete Reinforced with Fiber-Reinforced Polymer Bars

ACI PRC-506-22: Shotcrete—Guide

ACI PRC-522-23: Pervious Concrete—Report

ACI PRC-544.1R-96: Report on Fiber Reinforced Concrete (Reapproved 2023)

ACI PRC-544.3-08: Guide for Specifying, Proportioning, and Production of Fiber-Reinforced Concrete (Reapproved 2023)

ACI PRC-555-01: Removal and Reuse of Hardened Concrete

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ASTM A722 Standard Specification for High-Strength Steel Bars for Prestressed Concrete

ASTM A820 Standard Specification for Steel Fibers for Fiber-Reinforced Concrete

ASTM A1035 Standard Specification for Deformed and Plain, Low-Carbon, Chromium, Steel Bars for Concrete Reinforcement

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ASTM C457 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

ASTM C469 Standard Test Method for Static Modulus of Elasticity and Poisson’s Ratio of Concrete in Compression

ASTM C494 Standard Specification for Chemical Admixtures for Concrete

ASTM C496 Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens

ASTM C512 Standard Test Method for Creep of Concrete in Compression

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ASTM C618 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

ASTM C642 Standard Test Method for Density, Absorption, and Voids in Hardened Concrete

ASTM C666 Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing

ASTM C672 Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to Deicing Chemicals

ASTM C845 Standard Specification for Expansive Hydraulic Cement

ASTM C876 Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete

ASTM C944 Standard Test Method for Abrasion Resistance of Concrete or Mortar Surfaces by the Rotating-Cutter Method

ASTM C989 Standard Specification for Slag Cement for Use in Concrete and Mortars

ASTM C1064 Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete

ASTM C1012 Standard Test Method for Length Change of Hydraulic-Cement Mortars Exposed to a Sulfate Solution

ASTM C1157 Standard Performance Specification for Hydraulic Cement

ASTM C1202 Standard Test Method for Electrical Indication of Concrete’s Ability to Resist Chloride Ion Penetration

ASTM C1240 Standard Specification for Silica Fume Used in Cementitious Mixtures

ASTM C1260 Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)

ASTM C1293 Standard Test Method for Determination of Length Change of Concrete Due to Alkali-Silica Reaction

ASTM C1437 Standard Test Method for Flow of Hydraulic Cement Mortar

ASTM C1556 Standard Test Method for Determining the Apparent Chloride Diffusion Coefficient of Cementitious Mixtures by Bulk Diffusion

ASTM C1567 Standard Test Method for Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method)

ASTM C1600 Standard Specification for Rapid Hardening Hydraulic Cement

ASTM C1602 Standard Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete

ASTM C1603 Standard Test Method for Measurement of Solids in Water

ASTM C1610 Standard Test Method for Static Segregation of Self-Consolidating Concrete Using Column Technique

ASTM C1697 Standard Specification for Blended Supplementary Cementitious Materials

ASTM C1702 Standard Test Method for Measurement of Heat of Hydration of Hydraulic Cementitious Materials Using Isothermal Conduction Calorimetry

ASTM C1709 Standard Guide for Evaluation of Alternative Supplementary Cementitious Materials (ASCMs) for Use in Concrete

ASTM C1712 Standard Test Method for Rapid Assessment of Static Segregation Resistance of Self-Consolidating Concrete Using Penetration Test

ASTM C1778 Standard Guide for Reducing the Risk of Deleterious Alkali-Aggregate Reaction in Concrete

ASTM C1797 Standard Specification for Ground Calcium Carbonate and Aggregate Mineral Fillers for Use in Hydraulic Cement Concrete

ASTM C1798 Standard Specification for Returned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete

ASTM C1856 Standard Practice for Fabricating and Testing Specimens of Ultra-High Performance Concrete

ASTM C1866 Standard Specification for Ground-Glass Pozzolan for Use in Concrete

ASTM C1872 Standard Test Method for Thermogravimetric Analysis of Hydraulic Cement

ASTM C1897 Standard Test Methods for Measuring the Reactivity of Supplementary Cementitious Materials by Isothermal Calorimetry and Bound Water Measurements

ASTM C1905 Standard Specification for Cements that Require Carbonation Curing

ASTM C1910 Standard Test Method for Measurement of Flow Rate for Sprayed Fire-Resistive Materials Applied to Structural Members

ASTM C1928 Standard Test Method for Compressive Strength of Alkali-Activated Cementitious Material Mortars (Using 2-in. [50 mm] Cube Specimens)

ASTM C1948 Standard Specification for Alkali-Activated Cementitious Materials

ASTM G109 Standard Test Method for Determining Effects of Chemical Admixtures on Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride Environments

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AASHTO M 302 Standard Specification for Ground Granulated Blast-Furnace Slag for Use in Concrete and Mortars

AASHTO M 307 Standard Specification for Silica Fume Used in Hydraulic Cement Concrete and Mortar

AASHTO M 321 Standard Specification for High-Reactivity Pozzolans for Use in Hydraulic Cement Concrete, Mortar, and Grout

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