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Category Archives: Maintenance

Mortar Maintenance Part 1: Some Basics

Wilson Bridge

Repointing mortar is a regular maintenance item in mortared structures such as stone arch bridges. In this post we examine the value and limitations of repointing.

Posted byStoneArchBridgesMarch 17, 2023March 13, 2023Posted inMaintenanceTags:Design, Mortar

Repairing Fill-Related Problems

Front Circle Crack

Fill-related problems in a stone arch bridge take on several forms, but often result in bulging, sliding, and failure of bridge components. These problems can be addressed.

Posted byStoneArchBridgesDecember 2, 2022December 10, 2022Posted inMaintenanceTags:Fill, Forces, Quality of Construction

Hidden Structural Features

Detail of Walz Ford Bridge Arch

Many stone arch bridge feature subtle design features that are tucked away out of sight within the structure, which can greatly complicate rehab and load handling calculations.

Posted byStoneArchBridgesJuly 22, 2022July 23, 2022Posted inMaintenanceTags:Design, Forces, Quality of Construction, Stones

The Different Kinds of Mortar

Thompson Bridge

In this post we will briefly examine what makes the various types of commercially available mortar mixes different, and how this relates to repairing historic structures.

Posted byStoneArchBridgesJune 17, 2022June 20, 2022Posted inMaintenanceTags:Design, Mortar

When Walls Bulge

Double Arch Bridge

Bulging walls in the approaches and spandrel walls of a stone arch bridge indicate excessive force against them. This type of problem is fairly simply addressed.

Posted byStoneArchBridgesApril 22, 2022April 23, 2022Posted inMaintenanceTags:Design, Forces, Quality of Construction

Understanding Longitudinal Cracks in Arches

Deteriorated Stonework

Longitudinal cracking is a common defect on stone arch bridges. While often not overly serious, under the right conditions this cracking can indicate a major problem.

Posted byStoneArchBridgesMarch 11, 2022March 14, 2022Posted inMaintenanceTags:Forces, Spandrel Walls, Stones

Monitoring Stone Bridges

Waterline Deterioration

Regular checking on the progress of any and all deterioration of a stone bridge can allow serious problems to be corrected early, saving future expense and trouble.

Posted byStoneArchBridgesFebruary 7, 2022February 7, 2022Posted inMaintenanceTags:cracks, Stones

Understanding Mortar in Old Bridges

Buried Arch

The design of a stone bridge, which often reflects the era of its construction, determines how critical mortar condition is for long-term stability.

Posted byStoneArchBridgesDecember 17, 2021February 4, 2022Posted inMaintenanceTags:Design, Mortar, Quality of Construction

Improving a Stone Arch Bridge’s Serviceability by Strengthening: Part 2

NE 110th Street Double Arch Walnut River bridge

Here are several ways to strengthen a stone arch bridge, ranging from distributing loads over the arch to relieving the bridge from load altogether.

Posted byStoneArchBridgesAugust 20, 2021October 28, 2021Posted inMaintenanceTags:Butler, Design, Forces

Improving a Stone Arch Bridge’s Serviceability by Strengthening: Part 1

Wolf Creek Bridge

To determine how to strengthen a stone arch bridge, it helps to understand how it behaves when overloaded in order to understand the forces at play.

Posted byStoneArchBridgesAugust 13, 2021August 23, 2021Posted inMaintenanceTags:Forces

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