Recent Developments of Special Self-Compacting Concretes

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Title: Recent Developments of Special Self-Compacting Concretes

Author(s): M. Collepardi, A. Borsoi, S. Collepardi, and R. Troli

Publication: Special Publication

Volume: 222

Issue:

Appears on pages(s): 1-18

Keywords: expansive agent; high performance concrete; lightweight concrete; mass concrete; self-compacting concrete; shrinkage reducing admixture; silica fume; superplasticizer; viscosity modifying agent

Date: 5/1/2004

Abstract:
During the last decades new cementitious materials were available. These represent a technical revolution with respect to the traditional concretes. The most important innovative "High Tech" materials are Self-Compacting Concretes (SCCs). In the present paper the compositions, the performances and some practical applications of high-performance SCCs are shown. In particular, some performance improvements carried out in our laboratories are shown for these specific uses: a) SCC for a Building Engineering application (S. Peter Apostle Church in Pescara, Italy) with white concrete characterized by a marble-like skin; b) SCC in the form of high-strength concrete with compressive strength over 90 MPa devoted to a work in the field of Civil Engineering (World Trade Cen ter in San Marino); c) SCC in the form of mass concrete structure with a reduced risk of cracking in duced by thermal difference between the nucleus and the skin of the elements; d) SCC in the form of lightweight precast concrete with a density of 1750 kg/m3, 28-day compressive strength of 35 MPa, and 28-day flexural strength of 5 MPa; e) SCC in the form of a shrinkage-compensating concrete for reinforced concrete walls 8 m high and 55 m long.