165. Use of manufactured calcium carbonate in SCC targeted for commercial applications
Title: 165. Use of manufactured calcium carbonate in SCC targeted for commercial applications
Author(s): O. Bonneau, F. Tchieme, K.H. Khayat, B. Kanduth
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 1105 - 1111
Total Pages: 7
Nb references: 4
Abstract: This study was carried out to investigate the effect of manufactured calcium carbonate (CC) on high-range water reducing admixture (HRWRA) demand, workability, mechanical properties, durability, and unit cost of self-consolidating concrete (SCC). Four different concrete mixtures designed for cast-in place applications were produced with a binder content of 420 kg/m3. The control mixture was prepared with 100% Type-GU portland cement, while the other three mixtures contained limestone powder replacements of 10%, 15%, and 20% of portland cement. Self-compactability of fresh concrete was measured using the caisson, Vfunnel, and L-box tests. Static stability was evaluated by surface settlement determination during the dormant period. Rheological and thixotropic properties were evaluated using a modified MK III. Mechanical testing involved the evaluation of compressive strength development, elastic modulus, and flexural strength at 28 days. Frost durability, scaling resistance, and rapid chloride-ion permeability (RCP) were also investigated.
Test results showed that different combinations of manufactured limestone filler powders can secure satisfactory self-consolidating properties along with an increase in static stability that can be explained by better packing density of the powder component. A decrease in compressive strength, which is more important at early age than at 28 days, was observed in SCC made with limestone filler. This loss was limited to 5% at 28 days in the SCC containing 10% manufactured limestone filler, which corresponds to 42 MPa. The use of manufactured limestone filler resulted in some reduction in unit cost due to the lower price of this component and decrease in HRWRA demand compared with portland cement.
Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00