Effect of calcium formate as an accelerator on the physicochemical and mechanical properties of pozzolanic cement pastes

Journal Article · Tue Jun 01 04:00:00 EDT 2004 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2003.11.015· OSTI ID:20658359

Heikal, Mohamed

The aim of the present work is to study the effect of calcium formate (CF) as an accelerator on the properties of pozzolanic cement pastes. Three types of cements were used in this investigation. These cements were OPC and pozzolanic cements containing 80 mass% OPC and 20 mass% silica fume (SF) or 20 mass% ground clay bricks (GCB). The dosages of CF were 0.00, 0.25, 0.50, and 0.75 mass% of cement. The compressive strength, total porosity, and hydration kinetics such as free lime and combined water contents were investigated. The results obtained in this study showed that the addition of CF shortens the initial and final setting times and increases the compressive strength and combined water content as well as gel/space ratio at all ages of hydration. On the other hand, it decreases the total porosity. CF activates the liberation of Ca(OH){sub 2} of OPC pastes. The free lime content of pozzolanic cement in the presence of CF increases up to 7 days, then decreases at the later ages of hydration.

• OSTI ID: 20658359
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 6 Vol. 34; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BRICKS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CEMENTS
CLAYS
FORMATES
GELS
HYDRATION
KINETICS
MECHANICAL PROPERTIES
POROSITY
SILICA
WATER
X-RAY DIFFRACTION