Translate to:

Why White Pool Plaster Can Turn Blotchy

  • Rating: No Rating

Both white pool plaster coupons below have been in water for one year. Sometimes the water was slightly aggressive (negative LSI), and sometimes the water was slightly scale forming (positive LSI).

The top coupon was formed with only one percent calcium chloride (CC) added to the mix, and was properly troweled.  It remained a “uniform white” the entire time. 

The bottom coupon had 3% calcium chloride (CC) added, was late hard troweled, and also received some wet (water) troweling late in the process.

 

Note the light and darker color contrast of the bottom coupon creating a “blotchy” appearance. The darker areas are very dense due to the hard troweling. The lighter (white) areas and spots are due to higher water-to-cement ratio and porosity from wet troweling. Had that coupon not been troweled with water, it probably would have been more overall gray due to the high CC and late hard troweling only.

Sometimes, plasterers add 3% CC to a plaster mix to hurry up the hardening process and finish the pool faster. The plaster mix may harden so fast that the finishers can’t keep up. If the plaster is not smooth enough, the finishers may then splash water onto the surface to rework and soften up the plaster again in order to get it smooth.

This experiment demonstrates that improper troweling and workmanship can create non-uniform discolorations of pool plaster.

Views: 454

Comment

You need to be a member of Pool Genius Network to add comments!

Join Pool Genius Network

Sign in

E-mail

Password
 or Sign Up
By signing in, you agree to the amended Terms of Service and Privacy Policy.
Forgotten your password?

Events

Latest Activity

Norman Tyree is now a member of Pool Genius Network
2 hours ago
Kevin Misley replied to robinsenny's discussion Installing and Operating an Efficient Swimming Pool Pump
"I will agree on the first point that larger pumps will cost more operate. In the early 1980's,…"
8 hours ago
Profile IconBeau Martin and Roberta DiFranco joined Pool Genius Network
Thursday
Karl Toth is now a member of Pool Genius Network
Jul 12
robinsenny posted a discussion

Installing and Operating an Efficient Swimming Pool Pump

Hi,The larger the pump, the greater your pumping and maintenance costs. Therefore, you want to use…See More
Jul 12
robinsenny is now a member of Pool Genius Network
Jul 10
Heidi Dayne Hanson updated their profile
Jul 9
A-TEX Family Fun Center posted a status
Jul 8

© 2018   Created by PGN Admin.   Powered by

Badges  |  Report an Issue  |  Terms of Service

Offline

Live Video