FY26 - CD0060 Town Creek Bridge Rehabilitation & Tuckpointing Project

2026-11-03

Historic Stone Masonry Repointing 1 . Description - This work shall consist of raking and repointing masonry joints as directed by the engineer . This work is anticipated to be performed on the exposed exterior faces of the bridge , wingwalls and adjacent stone wall on the north side of Route E . No work is anticipated inside the arches ( barrels ) of the bridge . 2 . Materials a . Mortar i . Mortar shall conform to ASTM C270 , Type N and match existing original mortar in color , strength , texture and composition . See " Mortar Testing " elsewhere in these specifications . ii . Water shall be potable , clean and free from acids , alkalis or organic materials . iii . Sand shall conform to ASTM C144 and shall be hard , sharp , clean , well graded and free of organic material . iv . Lime shall conform to ASTM C207 Type S Hydrated Lime for Masonry Purposes . Air entrained lime shall not be used . v . Cement shall conform to ASTM C150 Type II Portland Cement . It shall not contain more than 0 . 6 percent alkali to avoid efflorescence . Air entrained mortar shall not be used . vi . The use of admixtures will not be permitted without the prior approval of the engineer . b . Shims - Shims required to support replacement stones and for full - depth pointing shall be hard plastic and removable . 3 . Execution a . Removing Existing Mortar i . Mortar shall be raked out from joints to depths equal to 2 . 5 times their widths , or to sound mortar , whichever is deeper ( minimum of ¾ "). Joints shall be brushed , vacuumed or flushed to remove all dirt and loose debris ...

Missouri

2026-04-29