Laserfiche WebLink
North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 19 <br />Over the life of slabs, cracks will develop and joints open, which will expose the subgrade and allow <br />water to enter from the surface and either saturate or perch atop the subgrade soils. This water intrusion <br />increases the potential for frost heave or moisture -related distress near the crack or joint. Therefore, we <br />recommend implementing a detailed maintenance program to seal and/or fill any cracks and joints. The <br />maintenance program should give special attention to areas where dissimilar materials abut one <br />another, where construction joints occur and where shrinkage cracks develop. <br />C.7. Pavements <br />C.7.a. Pavement Subgrade Preparation <br />We recommend the following steps for pavement and exterior slab subgrade preparation. Note that <br />project planning may need to require additional subcuts to limit frost heave. <br />1. Strip unsuitable soils consisting of topsoil, organic soils, and vegetation from the area, within <br />the proposed pavement subgrade area. <br />2. Have a geotechnical representative observe the excavated subgrade to evaluate if additional <br />subgrade improvements are necessary. <br />3. Slope subgrade soils to allow the removal of accumulating water. <br />4. Scarify, moisture condition, and surface compact the subgrade with at least five passes of a <br />large roller with a minimum drum diameter of 3 1/2 feet. <br />5. Place pavement engineered fill to grade and compact in accordance with Section C.2.e. to <br />bottom of pavement section. See Section C.6 for additional considerations related to frost <br />heave. <br />6. Proofroll the pavement subgrade as described in Section C.7.b. <br />C.7.11b. Pavement Subgrade Proofroll <br />After preparing the subgrade as described above and prior to the placement of the aggregate base, we <br />recommend proofrolling the subgrade soils with a fully loaded tandem -axle truck. We also recommend <br />having a geotechnical representative observe the proofroll. Areas that fail the proofroll likely indicate <br />soft or weak areas that will require additional soil correction work to support pavements. <br />BRAUN <br />INTERTEC <br />