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Nanotechnology seems to hold the key that allows construction and building materials to replicate the features of natural systems improved until perfection during millions of years. This paper reviews current knowledge about nanotechnology and nanomaterials used by the construction industry. It covers the nanoscale analysis of Portland cement hydration products, the use of nanoparticles to increase the strength and durability of cimentitious composites, the photocatalytic capacity of nanomaterials and also nanotoxicity risks.

The construction industry is responsible for the depletion of large amounts of nonrenewable resources. This activity generates not only millions of tons of mineral waste but also millions of tons of carbon dioxide gas emissions. Therefore, research about building materials based on renewable resources like vegetable fibres is needed. This paper discusses the use of vegetable fibres as reinforcement in cement based materials. It includes fibre characteristics, properties and the description of the treatments that improve their performance; it covers the compatibility between the fibres and the cement matrix and also how the fibres influence cement properties. It also includes the properties and durability performance of cementitious materials reinforced with vegetable fibres. Furthermore future research trends are also suggested.

This paper summarizes current knowledge about alkali-activated binders, by reviewing previously published work. As it is shown in Part 1, alkali-activated binders have emerged as an alternative to (ordinary Portland cement) OPC binders, which seem to have superior durability and environmental impact. The subjects of Part 2 of this paper are prime materials, alkaline activators, additives, curing type and constituents mixing order. Practical problems and theoretical questions are discussed. Topics for future work in this field are suggested.