UK: Seratech has developed a process using olivine, a mineral abundant in Earth's mantle, to produce ‘carbon-negative’ cement. The company's method involves replacing some of the clinker with silica extracted from olivine. Magnesium sulphate derived from the olivine reacts with CO₂ to form nesquehonite, a mineral that sequesters CO₂. This method uses CO₂ captured from emissions sources or directly from the air.

Sam Draper, CEO, explained the process: “The researchers extracted these compounds by dissolving powdered olivine in sulphuric acid. After separating the silica and magnesium sulphate, they bubbled CO₂ through the magnesium slurry to form nesquehonite.”

According to Draper, replacing 35% of regular cement with this silica would yield carbon-neutral results, while a 40% substitution could achieve carbon negativity. Current building standards allow up to 55% of cement to be replaced by this material, although robust testing has yet to be conducted.

Malaysia: Heidelberg Materials has announced its acquisition of ACE Group, a supplier of pulverised fly ash, effective 1 May 2024. Reusing fly ash from energy generation contributes to reducing the CO₂ intensity of composite cement. When used as an additive, fly ash can replace part of the energy-intensive clinker and thus reduce the CO₂ intensity of the cement.

The acquisition includes ACE Greencemt Venture, ASAS Asia and AGP Logistics, with the leadership team from ACE Group continuing to manage the operations post-acquisition. Both parties have agreed not to disclose the financial terms of the transaction.

Vietnam: Cement production in Vietnam has fallen by 0.7% year-on-year in the first four months of 2024, reaching 57.6Mt, according to the latest data from the government’s General Statistics Office. In April 2024, the country’s cement output was 16.8Mt, a year-on-year decline of 0.7%.

In 2023, the country produced 120.1Mt of cement, representing a year-on-year decrease of 4.5% from the previous year.

India: Nuvoco Vistas has announced its audited financial results for the year ended 31 March 2024. The producer recorded earnings before interest, depreciation and amortisation of US$199m, representing a year-on-year increase of 35%, and profit after tax of US$17.6m. Its net debt fell by US$46m year-on-year to US$482m. Cement sales volumes totalled 18.8Mt and revenue from operations reached US$1.3bn.