Application of Lowcement Castables
Since lowcast concrete possess less cement in structure, they are held subject to different application. This concrete is applied in vibration by adding approximately onlyone half of the quantity of water as would to a normal fire concrete.
MIXER TO BE USED FOR CASTING
A strong, high density mixer of 08-0,11m3 volume should be preferred for mixing. All mixing equipment should be
clean and dry. After material is made ready, application should be made by one single discharge. If more than
one discharge is needed in order to complete the casting, application should be made consecutively, and completed within appr. 35-40 minutes before material starts to dry.
Weight of individual sacks must be determined in extremely accurate manner prior to mixing material since this is of utmost importance in terms of quantity of water to be added. Place dry material in mixer first, adding minimal quantity of water and mix 2 to 3 minutes. Inspection by hand as it is done for regular concrete can not be used for LOWCAST concrete. Grad a hand full of mortar and squeeze it in order to understand if sufficient quantity of water is added. Material should stars to flow off your hand. If this happens, you ve got the right quantity of water. Purpose here is to add sufficient quantity of water for enabling LOWCAST concrete shake by vibration. Adding excessive water would deteriorate features of concrete. After adding water first time, duration for complete mixing must not exceed 5 minutes, max. The surface has to look smooth and wet in order to make visual testing of concentration of the cocnrete.
TYPE AND AMOUNT OF WATER TO BE ADDED
Water to be used for mixture should be clean enough to drink, temperature between 10 to 20 °C with a pH rating
between 6 - 8. All water to be used for mixing should be carefully checked and weighed. In vibration application, quantity of water used should be between 5.1 - 5.8.
LOWCAST concrete is vibrated within 35 to 40 minutes. Working time of concrete is effected immensely from the temperature. Temperature of dry material and water should be between 10 - 20 °C. If conditions disabled however, you should stard to work on only a small quantity at first, check and see if you are getting compatible results, then comtinue. If material is sufficient only for single casting, you should apply vibration for a minute or two between each casting (for quantities below 1 MT).