div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb 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 src=https:reader036vdocumentsmxreader036viewer20220816065e8329c7779251657319944chtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv