Hollowcore slab with alternative cementitious materials for winter conditions
- 1 October 2021
- journal article
- research article
- Published by Thomas Telford Ltd. in Magazine of Concrete Research
- Vol. 73 (20), 1060-1070
- https://doi.org/10.1680/jmacr.19.00378
Abstract
The precast industry, due to its specific early age strength requirements for hollowcore (HC) slab products, has been reluctant to introduce alternative cementitious materials like ground granulated blast furnace slag (GGBS), due to the slower strength development of such materials. This paper reports on a study undertaken at a precast production facility to examine how to overcome the consequences of strength loss due to replacement of up to 50% of the CEM I (42·5R), as usually used in cold weather conditions, with GGBS, for environmental or durability reasons. The GGBS concrete slabs were activated using thermal, chemical and mechanical means to enhance early age strength gain. The results were compared at early ages in terms of temperature profile during curing, cube compressive strengths, load carrying capacities for transportability requirements, ultimate load and short term creep. In addition, 28 day densities and strengths were compared for in-situ cubes and cores extracted from HC slab samples. The experimental results showed a favourable potential for replacing CEM I (42·5R) cement with up to 50% GGBS in winter without compromising on factory productivity.Keywords
This publication has 29 references indexed in Scilit:
- Mechanical activation of cement–slag mortarsConstruction and Building Materials, 2012
- The effect of chemical activators on early strength of ordinary Portland cement-slag mortarsConstruction and Building Materials, 2010
- Alkali-activated binders: A review: Part 1. Historical background, terminology, reaction mechanisms and hydration productsConstruction and Building Materials, 2008
- Effect of curing conditions on the mortars with and without GGBFSConstruction and Building Materials, 2008
- Effect of fineness and particle size distribution of granulated blast-furnace slag on the hydraulic reactivity in cement systemsAdvances in Cement Research, 2005
- Reactivity of blast-furnace slag in Portland cement blends hydrated under different conditionsCement and Concrete Research, 2001
- A study on creep and drying shrinkage of high performance concreteCement and Concrete Research, 2001
- The microstructure and mechanical properties of blended cements hydrated at various temperaturesCement and Concrete Research, 2001
- Chloride binding in GGBS concreteCement and Concrete Research, 1996
- Degrees of reaction of the slag in some blends with Portland cementsCement and Concrete Research, 1996