Displaying items by tag: concrete

US: Hawaii’s Department of Transportation plans to use carbon-injected concrete for its new projects. This will include a new structure to protect a highway tunnel from rockfalls, according to Reuters. The Department of Transportation was testing CO₂-injected concrete on an access road project with CarbonCure Technologies in May 2019. The latest decision follows a resolution by state legislators that city administrators ‘consider’ using CO₂-injected concrete in city and county infrastructure where concrete is used.

In late June 2019 CarbonCure announced that its had formed a partnership with HC&D Ready Mix, a local concrete producer, to use its CO₂-injected concrete process. It is the second deal with a concrete producer in the state that CarbonCure has arranged.

India: Ambuja Cement is looking for ready-mix concrete (RMX) and aggregate assets to buy as part of its growth plans. A company source quoted by the Business Standard newspaper said that it was considering ‘growth options’ in all of its core businesses of cement, RMX and aggregates. Industry analysts have interpreted this as an effort to diversify the business away from dominance by the cement sector. However, expansion in the RMX market is expected to be difficult owing to the lack of local organisation in the market.

The subsidiary of LafargeHolcim has a cement production capacity of 63Mt/yr, including those of ACC. Both Ambuja Cement and ACC use a master supply agreement to coordinate sales, marketing and logistics.

Italy: Buzzi Unicem says that its Unical subsidiary is the first national concrete producer to earn silver level RSS certification from the Concrete Sustainability Council. The accreditation asserts that a company meets criteria for sustainable practices and operates in a sustainable, environmentally positive manner. Unical’s Strada Berlia concrete batching plant in Turin received the certification in June 2019. The CSC procedure also included certifying the cement produced by Buzzi Unicem’s Robilante Cement plant and the aggregates from Ceretto quarry. The certificate was issued by ICMQ, the Italian Certification Body member of CSC. Unical manages more than 100 concrete plants in Italy.

France: Hoffmann Green Cement Technologies and Bouygues Construction have signed a 30-month initial technical and commercial collaboration agreement to develop and test concrete formulations using new cement made from Hoffmann’s H-EVA technology. Hoffmann Green Cement inaugurated its pilot plant at Bournezeau, Vendée in late 2018. The unit will manufacture cement products using flash-calcined metakaolin and blast-furnace slag. Bouygues Construction is a global construction company with a presence in over 60 countries.

US: Researchers from CalPortland have published a peer-reviewed study looking at the absorption or carbonation of CO₂ by buildings, pavements and structures made from concrete. The authors argue that this negative effect on CO₂ emissions is not being considered in global, national and regional greenhouse gas accounting methods. The paper calls for focused studies on CO₂ uptake in concrete within the context of its overall Life Cycle Assessment (LCA).

“It is time to further examine the value of concrete in the built environment as a significant carbon sink,” said Allen Hamblen, president and chief executive officer (CEO) of CalPortland. “To do so accurately, we must specifically look at the net effects of CO₂ sequestration in concrete and evaluate all structures over their lifetime within a circular economy.”

The study looks at previous attempts to quantify the effect of concrete carbonation, notably using work by the Swedish Environmental Research Institute (SERI) that examined data from several European countries to develop practical models to gauge the extent of CO₂ uptake by concrete globally in the built environment. Different models estimated that 15 - 20% of CO₂ emissions from clinker production were reabsorbed over the lifetime of concrete structures.

France: HeidelbergCement France has finalised the acquisition of Cemex’s Centre region aggregates and ready-mixed concrete businesses. The acquisition includes seven aggregate quarries and 28 ready-mixed concrete plants. The acquired aggregates reserves and resources amount to about 25Mt. HeidelbergCement France will fully integrate the operations into its own network.

“With this acquisition, we strengthen our vertically integrated market position in central France,” said Bernd Scheifele, chairman of the managing board of HeidelbergCement. “The operations fit very well into our existing network of aggregates and ready-mixed concrete plants in the Paris region, and we expect significant synergies.”

UK: Hanson has been part of a new continuous concrete pour record in the UK as part of its work at the EDF Energy’s Hinkley Point C (HPC) new nuclear power station in Somerset. It supplied raw materials for the concrete to main civil engineering contractor BYLOR, which operates the on-site concrete production plant. The 9000m³, five-day, pour was to construct the last of five reinforced concrete segments that make up the cross-shaped foundations on which all of the first nuclear reactor’s buildings will sit. The record-breaking pour beats the previous UK record set by the Shard skyscraper in London.

The completion of the foundation platform, which is up to 4m thick, represents a significant milestone for the project, described by EDF Energy as J-zero. It marks the transition from below ground activity to the construction of permanent reactor buildings above ground.

Hanson says that mix design for HPC took three years of development and testing to ensure that the concrete was of the required quality mandated by the Office for Nuclear Regulation. The subsidiary of Germany’s HeidelbergCement has 65 employees directly involved in the HPC project team. To date Hanson has supplied 51,000m³ of concrete, 2.5Mt of aggregates, 210,000t of marine sand, 65,000t of cement; 105,000t of ground granulated blast furnace slag (GGBS) and 125,000t of asphalt.

US: Charah Solutions plans to open a grinding plant to make supplementary cementitious materials (SCM) from natural pozzolan at Oxnard in California. The unit will be accessible by truck and railway. It will sell pozzolan and other materials to concrete product manufacturers throughout south California.

The Oxnard plant will be operated in partnership with Diversified Minerals, a supplier and manufacturer of standard and custom blend cement and concrete products. It will receive natural pozzolan by truck and rail and then grind pozzolan marketed under the brand MultiPozz pozzolan. MultiPozz pozzolan will be distributed throughout Charah Solutions’ MultiSource materials network of more than 40 nationwide in the US with international sourcing and distribution.

“Fly ash is becoming more difficult to source in California, which is forcing the construction industry to look for viable alternatives. Natural pozzolan and other SCMs that meet ASTM specifications are generating very high interest. With Charah Solutions’ resources and DMI’s strategic partnership with the only active pozzolan mine in Southern California, we are both the closest and the first to bring these products to market,” said Jim Price, chief executive officer (CEO) of Diversified Minerals.

US: Cemex has announced that it is supplying concrete, including a specialised self-consolidating mix, along with thousands of tonnes of aggregates for the replacement of the Sixth Street Viaduct Bridge in Los Angeles, California. The original 915m-long bridge, which has served as a backdrop in numerous films, was built in 1932 and is in need of replacement.

Cemex will supply 34,400m3 of ready-mix concrete. This will include 4800m³ of Evolution, Cemex’s range of self-consolidating concrete product that, in this instance, was tailored to fit the bridge’s design and the requirements of the client, CalTrans. Cemex will also supply a fibre-reinforced concrete solution for the bridge deck and structure itself. The US$482m structure, funded by a mixture of state and Federal funds, is expected to open in late 2020.

Germany/Portugal: Talleres Alquezar has been using two BHS mixers in a modular plant to produce a total volume of 400,000m³ of hydro dam concrete in Portugal since 2017. Two DKX 4.5 type twin-shaft batch mixers, each with a capacity of 4.5m³, have been integrated into the plant. Germany’s BHS says that using twin-shaft batch mixers has shown that can be utilised successfully to produce this kind of specialised concrete.

Three hydro dams are being built on the Tâmega River that are expected to generate 1760GWh for the Iberian market once they have been commissioned as part of Spanish energy group Iberdrola’s large-scale hydroelectric project in Portugal. 242,000m³ of concrete is needed in Daivões for the dam wall alone, which is planned to be 78m high and 265m long. Spain’s Talleres Alquezar is the project partner for this hydro dam. Once built, the construction in Daivões is expected to dam up to 56,200,000m³ of water.