The specification on the project was for a traditional sand and cement screed, mixed on site using a Putzmeister M760 with skip and scarper. The skip and scaper working together to reduce labour effort when mixing the screed, and ensuring the correct mix ratio of 1:4 Fibre Screed
Following the requirements of the British Standard BS8204-1:2003 by using Quinn Cement 42.5N strength supplied by Tekfloor Limited . When mixing half of the sand is placed in the vessel, then cement, water and construction fibres Adfil Fibrin 660F. The fibres are present to significantly reduce the occurrence of plastic shrinkage and plastic settlement cracking in screed. The second half of the sand is then added into the vessel before mixing begins. There is a good network of material suppliers to provide screed in Milton Keynes.
For convenience the screed is pumped to the exact location where it is required, and then the installers lay the screed to datum provided by Holland Build Limited .
A traditional sand and cement screed at a mix ratio of 1:4 Fibre Screed would be classed as a standard commercial screed, used in commercial projects such as schools, hospitals and offices. Drying times depend on the depth of the screed and site conditions, however a typical 75mm will take between 75-100 days to dry.
Further admixtures may be added to the screed to improve early strength gain to allow for early traffic and loading. A consideration for admixtures would be to enable faster drying of the screed, and this would allow for floor coverings to be laid very quickly after laying the floor screed. Program times can be significantly reduced by using a range of admixtures to change the performance characteristics of the floor screed.