Community Insider Winter 2017 - Page 30

WHY IS MY ASPHALT PAVEMENT FAILING? ASPHALT PRESERVATION AND PREVENTATIVE MAINTENANCE TIPS By: Bryan Holder As a Property Manager, you may always continue to ask the same question when assessing the condition of your streets and parking lots, and that question is: “What is causing the asphalt pavement to fail?” Now, assuming that the initial asphalt pavement was designed and constructed properly, the primary cause of failure is the penetration of water into the asphalt base (sub-grade or native soils). As soon as freshly laid hot asphalt begins to cool, the aging process also begins. This process begins with the breakdown of asphalt by elements such as oil, gas, salt, and sun oxidation of the pavement surface which causes the asphalt to dry and become brittle. This then leads to the erosion of the top layer of fine particles and the appearance of larger stones and small cracks on the surface. If left untreated, these cracks grow over time and eventually allow water to penetrate to the base of the pavement. When water enters the base of the pavement the base material moves and settles leading to further cracking and an “alligator appearance” over time. When the pavement reaches this stage, the only option is removal and replacement of the old asphalt. This damage can be kept to a minimum over time if the proper asphalt maintenance is followed. Here are some helpful informative tips that will assist you when making decisions regarding preventative maintenance on your streets and parking lot areas. Make sure to carefully inspect your pavement surfaces on a regular basis for cracks, fading pavement markings, and other signs of failures or liability issues. Proper attention to cracks will prevent problems from spreading and double the life of the pavement. Singular cracks that are between ¼ inch wide and ½ inch deep are good candidates for “crack sealing.” Sitting water areas on the asphalt are often referred to as “bird baths” and having them fixed as soon as they appear will lessen the chance of water seeping through to the base and becoming a pothole. Seal coating the streets and parking lots also helps to slow down the pavement deterioration process. Seal coat is designed to act as a skin to the asphalt to prevent the oxidation and erosion of the top layer of the pavement. Seal coating can seal the small cracks that can turn into large cracks, preventing water from seeping down into the base below the asphalt. For larger areas, such as all streets or parking lots that have been overlaid with new asphalt, Seal coating should be applied 6 to 12 30 | SAN DIEGO COMMUNITY INSIDER | WINTER 2017 WWW.CAI-SD.ORG WHY IS MY ASPHALT PAVEMENT FAILING? ASPHALT PRESERVATION AND PREVENTATIVE MAINTENANCE TIPS By: Bryan Holder A s a Property Manager, you may always continue to ask the same question when assessing the condition of your streets and parking lots, and that question is: “What is causing the asphalt pavement to fail?” Now, assuming that the initial asphalt pavement was designed and constructed properly, the primary cause of failure is the penetration of water into the asphalt base (sub-grade or native soils). As soon as freshly laid hot asphalt begins to cool, the aging process also begins. This process begins with the breakdown of asphalt by elements such as oil, gas, salt, and sun oxidation of the pavement surface which causes the asphalt to dry and become brittle. This then leads to the erosion of the top layer of fine particles a H\X\[Hق\\ۙ\[X[ܘX›ۈH\XKYY[X]Y \HܘXܛݙ\[YB[][X[H[]\œ[]]HH\HوB][Y[ []\[\H\HوH][Y[B\HX]\X[[ݙ\[]\›XY[\\ܘX[[['[Y]܈\X\[x'Hݙ\[YKSQQSUSUHSQTST MB[H][Y[XX\\YKHۛH[ۈ\[[ݘ[[\X[Y[وH\[ \[XYH[H\HZ[[][Bݙ\[YHYH\\[XZ[[[H\Y \H\HYH[[[ܛX]]H\][\\[H[XZ[X\[ۜY\[][]]HXZ[[[Hۈ[\Y]˜[\[\X\ˈXZH\H\Y[H[X[\][Y[\X\ۈHY[\\\܈ܘXY[][Y[X\[[\YۜوZ[\\܈XX[]H\Y\ˈ\][[ۈܘX[][؛[\HXY[[XHHYHوH][Y[ [[\ܘX]\H]Y[0[YH[0H[Y\\H[Y]\܈8'ܘXX[[˸'H][]\\X\ۈH\[\Bٝ[Y\Y\8'\]'H[][[H^Y\ۈ\^B\X\[\[H[Hو]\Y\[YH\H[XZ[HKX[][HY][\[[[ۈB][Y[]\[ܘ][ۈ\ˈX[]\\YۙYX\H[H\[][HY][ۈ[\[ۈوH^Y\قH][Y[ X[][[X[HX[ܘX][\[›\HܘX][[]\HY\[ۈ[H\H[H\[ ܈\\\X\X\[Y]܈\[]]BY[ݙ\ZY]]\[ X[][[H\YY  LːRKT ԑ