Equipment World Digital Magazine
Issue link: http://read.dmtmag.com/i/846046
July 2017 | EquipmentWorld.com 52 concrete aggregate use, and 12 percent was used on embankments or was wasted. Historical concrete pavements It's hard to argue the longevity of concrete, as we marvel at the Roman structures scattered across Europe that have withstood mil- lennia. And while we don't have such a lengthy historical perspec- tive in the United States, there are a number of concrete pavements that have withstood decades of use and abuse. The ACPA is creating a store- house of old concrete pavements, with their fi rst step being the creation of the Historic Concrete Pavement Explorer website last year. The map-based, mobile- friendly site provides details on these pavements, with potential for photo galleries, technical de- tails and historical context. "The website represents ACPA's commitment to the Task Force on Preservation of Artifacts from His- torical Concrete Pavements," says ACPA President and CEO Jerry Voigt. "The task force is working to document concrete pavements and collect photographs and other artifacts for concrete pavements that are 75 years or older and/or which represent 'fi rsts' and other signifi cant milestones throughout history." The launch of the site roughly coincided with the 125th anniver- sary of the country's fi rst concrete pavement, placed in 1891 in Belle- fontaine, Ohio, by George Bar- tholomew and WTG Snyder. That original pavement is no longer in use; however, pavement that was placed around the town square just two years later remains. It has undergone some rehabilitation, including full- and partial-depth concrete patching in 1962, the early 1990s and in 2007. This pavement was considered an engineering marvel at the time. So much so, that a section of the concrete was on display at the 1893 Chicago World's Fair and won fi rst place for Engineering Technology Advancement in Pav- ing Materials. On July 12 this year, the ACPA, the City of Bellefontaine, the Ohio Chapter of the ACPA and the Task Force on Preservation of Artifacts from Historical Concrete Pave- ments held a celebration to com- road technology | continued These include: • Subgrade: The street was excavated to 6 inches deep and then carefully rolled and compacted. • Cross section: The slab is 6 inches thick and was constructed as a two-lift pavement, featuring a 4-inch bottom lift followed by a 2-inch top lift. • Joint/panel layout: The concrete was placed in 5-foot by 5-foot blocks, and tarpaper separated the panels. • Mix design, bottom lift: The bottom lift used one part cement to fi ve parts clean, unwashed gravel (containing about one-third sand), with a 1-1⁄2- inch maximum aggregate size. • Mix design, top lift: The top lift used three parts cement to fi ve parts sand, with a half-inch maximum ag- gregate size. • Surface: V-shaped indentations were imparted in the pavement surface at 4-inch intervals to provide footing for horses. • Curing: The pavement was cured for one week using a 2-inch layer of wet sand. Bellefontaine concrete pavement design and construction T he concrete pavement placed in Bellefontaine, Ohio, in 1893 had a number of special design and construction characteristics that made it unique for its time, as well as able to withstand years of abuse. It is the oldest continuously used concrete pavement in the U.S., making it a model of sustainability. (source: ACPA) Be a cool operator Be a cool operator 1-800-267-2665 • sales@hammondac.com • www.hammondac.com When you work hard in small spaces, you need AC big time! With over 1200 different kits engineered and developed, count on Arctic Wolf™ for factory-style integrated air conditioning systems in ready-to-fit kits. Loaders. Dozers. Excavators. Graders. Tractors. If your equipment has an engine and a cab on it, we can put cool air into it. Call today. 1-800-2 MR COOL or go online at www.hammondac.com and order your system and parts today. 081-178 Equip World 4.5x4.5.indd 1 2016-06-01 2:18 PM