Cement developer secures U.S. patent for alkaline ettringitic powder

Sources: Hoffmann Green Cement Technologies, Paris; CP staff  After nearly three years of examination, the United States Patent Office has validated the Hoffman Green Cement Technologies H-EVA patent (US 2021/0179492 A1). Promoted as an alternative to portland cement for ready mixed concrete, mortars and plaster, H-EVA encompasses flashed clay sludge, natural or synthetic (flue gas desulphurization) gypsum, plus proprietary chemical…

Read More

Chryso tempers concrete carbon factor in new admixture series

Sources: Chryso Group, Paris; CP staff The parent company of Texas-based Chryso Inc. has announced a global range of admixture products and companion services aimed at controlling the carbon footprint of ready mixed and precast concrete. Paired with supplementary cementitious materials, EnviroMix agents enable carbon dioxide emissions reduction up to 50 percent when measured against conventional concrete mix designs, while…

Read More

Low carbon LC3 binder steers Sika’s next admixture chapter

Sources: Sika AG, Baar, Switzerland; CP staff The Swiss parent company of New Jersey-based Sika Corp. will tailor a new family of concrete admixtures and cement additives around the chemistry and behavior of an emerging binder known as LC3, or Limestone Calcined Clay Cement. Through work with Sika AG and peers, Swiss Federal Institute of Technology officials view the material…

Read More

CarbonBuilt: NRG Cosia Carbon Xprize winner

Sources: CarbonBuilt, Los Angeles; CP staff The University of California, Los Angeles Samueli School of Engineering-minted CarbonBuilt team has been named one of two winners in the NRG Cosia Carbon Xprize competition, its $7.5 million award recognizing technology that reduces the carbon footprint of concrete production by more than 50 percent. The team of faculty members, project scientists, graduate students…

Read More

Knife River eyes carbon accounting, synthetic aggregate with Blue Planet stake

Sources: MDU Resource Group, Bismarck, N.D.; CP staff Knife River Corp. has invested in California-based Blue Planet Systems Corp., whose process for mineralizing carbon dioxide into synthetic limestone is approaching commercial scale. The companies will work to develop construction-grade rock and ultimately specification concrete bearing a net-zero or net-negative carbon footprint. 

Read More

Rebar top gun Nucor wires renewable energy into steelmaking loop

Sources: Nucor Corp., Charlotte, N.C.; CP staff Leading concrete reinforcing steel producer and fabricator Nucor has signed a 15-year Virtual Power Purchase Agreement with EDF Renewables North America for 250 megawatts of new solar array-derived energy in Texas. A first for Nucor, the agreement positions EDF Renewables to add more clean energy to the South Central power grid and becomes…

Read More

LafargeHolcim adopts new label for low CO2 and recycled content materials

Sources: LafargeHolcim Ltd., Zurich; CP staff Cement and concrete from LafargeHolcim will soon bear a logo shaped like a mobile device icon indicating two principal qualities realized in processing, mix design and batching: A carbon dioxide emissions footprint 30 percent or lower compared to local industry standard and a minimum 20 percent recycled material content. The producer revealed the EcoLabel…

Read More

Cemex begins global rollout of branded, net-zero CO2 concrete

Sources: Cemex S.A.B. de C.V., Monterrey, Mexico; CP staff The first-ever net-zero carbon dioxide concrete from Cemex will soon be available in the producer’s major markets worldwide after a successful launch in Europe. A series ranging from low carbon to net-zero CO2 mixes, Vertua is based on a geopolymer binder solution from the Cemex Research and Development Center in Switzerland. Compared to…

Read More