div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=place-several-drops-of-distilled-or-deionized-water-on-a-clean-surface-of-concretehtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Place several drops of distilled or deionized water on a clean surface of concrete forming a puddle approximately 1 inch 25 mm in diameter 2 Allow the puddle to set for 55 to 65 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader036vdocumentsmxreader036viewer20220816065e8329c7779251657319944chtml5thumbnails1jpg width=140 height=200 divdiv