10. Conclusion

In the 1990s, the cement industry as a whole was calling for alkali-free cements to avoid the alkali-aggregate reaction. We countered this approach with a conference entitled High-Alkali cements for 21 ^th century concretes . It seemed obvious to us that the problems posed by CO ₂ greenhouse gas emissions would eventually involve the introduction of new cements, such as geopolymer cements. But, in an industry like cement, strongly governed by compliance with strict technical standards,...