EPD: Slag cement (Holcim, South Chicago plant)

Slag cement, UN CPC 3744, is defined in ASTM C125 as granulated blast-furnace slag that has been ground to cement fineness, with or without additions, and that is a hydraulic cement [2]. Slag cement is a supplementary cementitious material (SCM). Iron blast furnace slag (BFS) is a waste material of pig iron production and as such is categorized as a recovered material [2]. To transform iron BFS, so it can be used as a SCM in concrete and mortars, it is first rapidly quenched with water to form granules known as Granulated Blast Furnace Slag (GBFS). It then undergoes dewatering, crushing of oversized material only (if applicable), and storage at the granulating facilities. GBFS is then shipped to the grinding facilities where it undergoes dewatering/drying (if applicable), iron removal from slag granules (if applicable), crushing (if applicable), grinding, and packaging (if applicable). The slag cement is then stored onsite.

Manufacturer legal entity:

Holcim, South Chicago plant

Manufacturer:

Holcim

Country of manufacturer:

illinois, USA

Product name:

Slag cement

Material type:

Cement, binders and additives

Material subtype:

Alternative concrete binders

Environmental & technical characteristics

Global warming potential (A1-A3):

0.0950 kg CO2e/kg

Available units for calculation:

kg, ton

Unique identifier (OCLID):

627e097c37b1b6663d0c8a67

Sustainability data background information

EPD number:

EPD-298

EPD program:

ASTM

Publication year:

2022

Product category rules (PCR):

NSF PCR for Preparing an Environmental Product Declaration for Slag Cement, v2.0, December 2020

Environmental standard:

ISO 14040

Verification status:

Third-party verified (as per ISO 14025)

Upstream database:

ecoinvent