Prediction of setting for admixture modified mortars using the VCCTL
| Autor: | Christopher C. Ferraro, Benjamin E. Watts |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Cement
Bearing (mechanical) Chemical substance Materials science 0211 other engineering and technologies 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology law.invention Matrix (geology) Portland cement law 021105 building & construction General Materials Science Mortar Composite material 0210 nano-technology Suspension (vehicle) Reduction (mathematics) |
| Zdroj: | Cement and Concrete Composites. 78:63-72 |
| ISSN: | 0958-9465 |
| DOI: | 10.1016/j.cemconcomp.2016.11.002 |
| Popis: | The time at which Portland cement concrete transitions from a viscous suspension of particles to a rigid interconnected matrix is commonly referred to as “time of set” and is a critical parameter when placing concrete structures. Use of chemical admixtures in concrete for water reduction or acceleration of hydration alters setting behavior; laboratory quality control testing is required to define the altered setting behavior. Use of the Virtual Cement and Concrete Testing Laboratory (VCCTL) for prediction of early age concrete behavior has been limited to plain portland cement concrete. Direct modeling of kinetic and thermodynamic behavior for admixture modified concrete remains challenging. An indirect method to simulate admixture alteration of set is proposed. Hydration simulations are time calibrated using heat of hydration curves obtained from admixture bearing pastes. Simulation results are compared to mortar setting tests, with agreement in certain cases falling within standard specified precision values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect