| abstract |
The invention relates to a method for accelerating the setting of a cement, in particular shotcrete, using an accelerator having at least two components, with the following method steps: a first or second component of an accelerator is added to the cement in addition to aggregates, the other component of the accelerator is added to the cement at a time interval from the addition of the first component shortly before the processing of the cement, which first component contains the following substances (all data in% by weight): 40-90% calcium hydroxide, 5-50% calcium formate and / or 5-20% tartaric acid and which second component contains the following components: Aluminum sulphate or aluminum hydroxy sulphate 20-40%, Aluminum hydroxide 5-25%, H 2 O 10-50% and a carboxylic acid or organic sulfonic acid or its salts 5-45%. The invention also relates to a two-component accelerator having the above composition. |