Membership Directory & Resource Guide - 2018 - 21

order to properly minimize all potential etching problems it ta
application practices, good start-up procedures and a proper re
Materials and Water Chemistry

Introduction

A typical swimming pool cementitiousTECHNICAL
surface coating
consists
BULLETIN
NO.o 3 * 2016 * pg 1 of 4
white), white sands (typically limestone, quartz or dolomite),
glassbead), water, with or without additives (which aid in the
surface), and pigments.1 The principle compounds of whit
Swimming
Pool
Interior
Finishes
andaluminat
calcium silicate,
di-calcium
silicate,
and tri-calcium
these
principle compounds
(react with water) to form an
Chemical
Etching hydrate
Deterioration
hydrate (CSH) and calcium alumino-silicate hydrate (CASH), whic
white cement.2 Simultaneously, the compound calcium hydroxide (CH), which is
is formed. CH makes up approximately 24% to 27% of fully-hydrated white cement.

Swimming pool cementitious finishes are one of the most popular
types of in-ground pool surface coatings because of the
beauty and durability. There will be more noticeable
cosmetic irregularities with smooth trowel finishes, as
opposed to exposed aggregate finishes, as the surface
interacts with its environment. In order to properly
minimize all potential etching problems it takes a
combination of good materials, application practices,
good start-up procedures and a proper regimen of care
and maintenance.
Materials and Water Chemistry

Technical Bulletins

A typical swimming pool cementitious surface coating consists
of a mixture of hydraulic cement (typically white), white
sands (typically limestone, quartz or dolomite), or other
aggregates (colored quartz, pebble, glassbead), water,
with or without additives (which aid in the placement and
finishing of the cementitious surface), and pigments.1
The principle compounds of white cement prior to mixing
with water are: tri-calcium silicate, di-calcium silicate,
and tri-calcium aluminate. When white cement is mixed
with water, these principle compounds hydrate (react with
water) to form an interlocking network of calcium
silicate · mail@npconline.org · ph: 847.416.7272 · fx:
NPC online.org
hydrate (CSH) and calcium alumino-silicate hydrate
THE NATIONAL PLASTERERS COUNCIL · 1000 N. Rand Road · Suite 214 ·
(CASH), which are the principles "binders" of hardened
white cement. 2 Simultaneously, the compound calcium
hydroxide (CH), which is a more soluble compound,
is formed. Pool
CH makes
upFinishes
approximately
24% to Etching
27%
Swimming
Interior
& Chemical
Deterioration
Issue No. 3 / PG 2 of 5
of fully-hydrated white cement.

21

HAND
TROWELED
SURFACE
BULK MATRIX

Inherent in cementitious coatings are many small void spaces and micro-cracks. There is aNspecial
PCon li n e .org
http://www.npconline.org/
Table of Contents for the Digital Edition of Membership Directory & Resource Guide - 2018
