Polymer modified cement

[67parrothead]

Our company makes polymer-modified portland cement coatings for resurfacing asphalt pavements. Recently, we shipped material for a project that had a superplasticizer added to the acrylic emulsion at our factory 7-10 days prior to mixinging on site. The installer reports the material is setting up in the mixers in 15-20 mins. The only change in this mix design was substitution of polypropeleyne fibers in lieu of fiberglass. Are the PP fibers taking up that much more water? or did something happen to the super-p?

 

[patprimmer]

PP absorbs virtualy no water.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

http://eng-tips.com/market.cfm

for site rules

 

[Demon3]

PP is completely inert and is not reacting with your system. It adsorbs no water.

You mentioned addition of superplasticizer (dispersant). Was that a normal part of the process? You state the only change is the fibers but in that case I don't know why you mentioned the superplasticizer. Adding that is far more likely to affect the acrylic emulsion than the PP is.

All the best,

Chris

Chris DeArmitt - PhD FRSC CChem
Plastic & Additives Webinars
Instant Downloads & Inexpensive

http://www.plastictraining.com