A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Polymer controlled mineralization of calcium hydroxide and calcium silicate hydrate
Cement and concrete are the most common building materials worldwide. Cement is the product which is manufactured industrially in the largest quantity (about 1600 million tons per annum). Calcium silicate hydrate and calcium hydroxide (Portlandite) are important mineral phases for the strength of common cement and concrete. Portlanditebased cement is made by heating a mixture of limestone and clay, or any other materials of similar bulk composition and sufficient reactivity, to a temperature of about 1450 degree C. Partial fusion occurs and nodles of clinker are produced. The clinker normally contains four major phases, called alite, belite, aluminate and ferrite. In contact with water a hydratisation process starts and mineral phases like calcium silicate hydrate and calcium hydroxide appear in the cement-paste. In order to reach a better workability and especially to transport the concrete (to/from the construction site), superliquidizers and retarders are required. These are mainly based on charged polymers. These polymers are added with water and trigger off the hydratisation process. In controlling the crystal growth of calcium hydroxide and the different calcium silicate hydrate phases, it should be possible to obtain concrete with tunable mechanical properties. Goal is thus a general understanding of the interaction mechanisms between polymers and a crystal surface.
Polymer controlled mineralization of calcium hydroxide and calcium silicate hydrate
Cement and concrete are the most common building materials worldwide. Cement is the product which is manufactured industrially in the largest quantity (about 1600 million tons per annum). Calcium silicate hydrate and calcium hydroxide (Portlandite) are important mineral phases for the strength of common cement and concrete. Portlanditebased cement is made by heating a mixture of limestone and clay, or any other materials of similar bulk composition and sufficient reactivity, to a temperature of about 1450 degree C. Partial fusion occurs and nodles of clinker are produced. The clinker normally contains four major phases, called alite, belite, aluminate and ferrite. In contact with water a hydratisation process starts and mineral phases like calcium silicate hydrate and calcium hydroxide appear in the cement-paste. In order to reach a better workability and especially to transport the concrete (to/from the construction site), superliquidizers and retarders are required. These are mainly based on charged polymers. These polymers are added with water and trigger off the hydratisation process. In controlling the crystal growth of calcium hydroxide and the different calcium silicate hydrate phases, it should be possible to obtain concrete with tunable mechanical properties. Goal is thus a general understanding of the interaction mechanisms between polymers and a crystal surface.
Polymer controlled mineralization of calcium hydroxide and calcium silicate hydrate
Polymer-kontrollierte Mineralisierung von Calciumhydroxid und Calciumsilikathydrat
Arnold, M. (author) / Trettin, R. (author)
2006
8 Seiten, 8 Bilder, 3 Quellen
Conference paper
English
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