Standard Practice for Use of Hydraulic Cement Mortars in Chemical-Resistant Masonry (Withdrawn 2021)

This practice provides recommendations for use of hydraulic cement mortars for chemical-resistant masonry construction. For Portland and Portland blast-furnace slag cements, no calcium aluminate cement, lime, or admixture shall be mixed with these cements, in the mortar batch or in the mixing water. On the other hand, no Portland or Portland blast-furnace slag cements, lime, or admixture shall be mixed with calcium aluminate cement, in the mortar batch or in the mixing water. The brick shall be clean and protected from frost damage. Materials proportions shall be in accordance with the requirements indicated in this standard practice. The mixing water shall be approximately neutral and shall be potable. During the preparation of concrete fill or sub-base in new construction, the surface of the concrete fill shall be free of mortar drippings and projecting joints. Acceptable surface texture requirement is indicated in this standard practice. All dirt, dust, loose particles, surface laitance, and debris shall be removed from the concrete fill or sub-base by vigorous brooming, vacuuming, or other means. The surface must be free of grease, oil, or wax deposits. Wood or metal strips shall be used to gage the thickness of the setting bed. Several hours before placing the setting bed, the prepared concrete surface shall be thoroughly saturated with clean water. When required, the expansion joint strips shall be located and set in position. All equipment shall be clean and free of other cement, lime, and plaster, prior to mixing and placing setting bed. Grouting shall be done as soon as possible after the initial set has taken place in the setting bed. It is essential that hydraulic cement mortar or grout joints be properly cured to ensure maximum retention of the mixing water.