LafargeHolcim is set to be the world's leading player in cement, concrete and aggregates once the tie-up is completed in the first half of next year.
France's Lafarge, which entered the UK market in 1987 before acquiring Redland in 1997 and Blue Circle in 2001, recently merged its UK operations with those of Anglo American to create LafargeTarmac, a business employing 5,500 staff at 300 sites. Holcim owns Aggregate Industries in the UK.
With the deal set to receive close scrutiny from regulators, the companies plan to offload assets generating between 10% and 15% of their global earnings. No country will account for more than 10% of combined revenues.
The tie-up has been presented as a merger of equals, with the new board featuring equal numbers of Lafarge and Holcim directors.
France's Lafarge employs 64,000 people and generated sales of 15.2 billion euros (£12.6 billion) in 2013, while Zurich-based Holcim achieved sales of 19.7 billion Swiss francs (£13.3 billion).