GMB members employed by Brighton & Hove Cityclean as refuse and recycling drivers have announced a further three days of strike action.
The workers had previously taken industrial action on 12 and 15 September in a dispute over pay and allowances, but will now strike again on 25 and 30 September and again on 3 October.
The council met the trades union officials on 19 September, but talks failed to resolve the on-going dispute.
GMB said managers are refusing to discuss or acknowledge their proposal so members had no option other than more industrial action.
Mark Turner, GMB branch secretary, said: “The talks ended without the council being able to present any proposal or time frame which would allow the GMB to go back to members to seek a suspension of action whilst talks continued.
“We are very disappointed that once again the council has been unable to show any willingness to meaningfully seek a resolution of this dispute.”
Geoff Raw, executive director for environment, development and housing at Brighton & Hove City Council said: “We met GMB representatives today (19 September) and we will continue our discussions next week to seek a resolution to the current dispute.”