Pavement condition monitoring can lead to timely preventive action. Sealing Asphalt Cracks Survey of pavements Īt-risk pavement are more often local roads with lower structural standards and more complicating factors, like underground utilities, than major arteries. Providing adequate drainage structures 3. Surveying of pavements for risk factors 2. The following steps can be taken to avoid pothole formation in existing pavements: 1. Pavement defects and cracks left unmaintained and unsealed so as to admit moisture and compromise the structural integrity of the pavement Failures at utility trenches and castings ( manhole and drain casings) 4. Insufficient pavement thickness to support traffic during freeze/thaw periods without localized failures 2. Potholes may result from four main causes: 1.
Serious road accidents can occur as a direct result, especially on those roads where vehicle speeds are greater. If they become large enough, damage to tires, wheels, and vehicle suspensions is liable to occur. Potholes can grow to several feet in width, though they usually only develop to depths of a few inches. In the spring, thaw of pavements accelerates this process when the thawing of upper portions of the soil structure in a pavement cannot drain past still-frozen lower layers, thus saturating the supporting soil and weakening it. In areas subject to freezing and thawing, frost heaving can damage a pavement and create openings for water to enter. Eventually, chunks of pavement between the fatigue cracks gradually work loose, and may then be plucked or forced out of the surface by continued wheel loads to create a pothole. Potholes form progressively from fatigue of the road surface which can lead to a precursor failure pattern known as crocodile (or alligator) cracking.
Water weakens the soil beneath the pavement while traffic applies the loads that stress the pavement past the breaking point.
Send us feedback about these examples.A deep pothole with a nearby patched area on New York City's Second AvenueĪccording to the US Army Corps of Engineers's Cold Regions Research and Engineering Laboratory, pothole formation requires two factors to be present at the same time: water and traffic. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'outer space.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2022 The molecules likely originally formed through photochemical reactions in ice in outer space before our solar system even existed, Oba said. 2023 In addition to holidays, there are Paint By Sticker Kids books with undersea, outer space, unicorn and dinosaur themes, among others. Eric Tucker, Anchorage Daily News, 13 Feb. has been able to rule out is any connection to extraterrestrial activity, the White House said Monday, tamping down lighthearted public speculation about aliens and outer space. 2023 Yes, this is the person who suggested that California fires were the result of Jewish space lasers being fired from outer space. 2023 Sk圜ool’s approach takes advantage of the property of energy at certain wavelengths to radiate from a surface through the atmosphere all the way into outer space, cooling the surface without heating the surroundings.
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2023 The claim: The first photo of Earth's curvature was taken on April Fools' Day, 1960 A March 9 Facebook post (direct link, archive link) features an image of the Earth taken from outer space. 2023 But scientists point to a likely animal source, ranging from horseshoe bats to raccoon dogs to even outer space. Recent Examples on the Web According to the Pentagon, there is no credible evidence any of the still unidentified objects came from outer space.
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