Industrial Technology

Binders for durable and sustainable concrete by Pierre-Claude Aïtcin

By Pierre-Claude Aïtcin

Linking conception to perform, this ebook offers a greater basic figuring out of Portland cement and hydraulic binders that's essential to make larger concrete. it's been sincerely proven that concrete longevity is heavily associated with its water/binder ratio and correct curing in the course of the first week after casting.

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The durability of roads, bridges, pillars and wharfs built with lime mortars is essentially a function of the environmental conditions to which they are exposed. 9 Calcium carbonate cycle. Binders and concrete of yesterday 27 Presently, lime is still used as a construction material by masons, who mix it half-and-half with Portland cement to make their mortars. 4 Hydraulic binders based on pozzolans Although pozzolanic mortars and concretes are only very specific lime mortars, they played a key role as construction materials, because they were the first hydraulic binders that hardened under water.

6 The development of modern concrete Isambard Brunel was one of the first engineers to use reinforced concrete during the construction of a tunnel under the Thames in 1828. 17). In 1865, Joseph Monier patented concrete flower pots, reinforced with a steel mesh (Bosc 2000). 15 Principle of Portland cement manufacturing.

In spite of the fact that the first hydraulic limes and natural cements could have irregular properties due to the lack of comprehensive knowledge regarding the control of their ideal composition, their optimum firing temperature and their grinding, hydraulic limes and natural cements started being used in Europe, in Russia and in the USA. In particular, natural cement was used during the construction of the Lake Erie canal in 1818. On 21 October 1824, Joseph Aspdin, an English mason, applied for the first patent on an improved cement he called Portland cement, because when it had hardened, its colour was like that of the well-known limestone of Portland island (Appendix II).

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