Research of a New Chemically Resistant Repair Mortar Modified with Secondary Raw Materials

This paper deals with the research of a new chemically resistant cement repair mortar modified with selected secondary raw materials. The aim of this work is to study the influence of particle distribution of fly ash on selected characteristics of the developed remediation material. This new mortar will be suitable for use in the extremely aggressive environment of sewers. The monitored parameters include key physical-mechanical characteristics and resistance to the attack of aggressive biogenic sulfuric acid. The chemical resistance was tested by simulating the exposure environment in laboratory conditions, according to the methodology of DIN 19573. The obtained results show that by optimizing the particle distribution of fly ash it is possible to maintain the values of physical-mechanical characteristics and improve the chemical resistance of test specimens of new repair mortar.