Thickening agent, VISCO TOP UT greatly reduces dust generated from sprayed concrete
Background & challenges
The amount of dust generated when spraying concrete in mountain tunnel operations is extremely high and has become a serious social issue, resulting in litigation over the damage it causes to the health of tunnel construction workers.In Japan, dust guidelines were revised in April 2021, amending the acceptable dust concentration from 3 mg/㎥ or less to 2 mg/㎥ or less. Further reinforcement of dust measures is becoming a challenge.
Accelerators are used in sprayed concrete due to the occurrence of what is called rebound.A large number of powder type accelerators are used in Japan due their superior strength properties; however, they also pose the problem of a large amount of dust generation.
VISCO TOP UT achieves dust concentrations of 2 mg/㎥ or less, with half the amount of general dust-reducing agents
Significant dust reduction complies with new guidelines
Example of sprayed concrete mix
Easy to use
No need for additional admixture
Early strength (pullout test)
Long term strength (core compressive test)