<p><p><h2>Commentary</h2>Payment for bulk infill grouting typically consists of a drilling pay item measured by the lineal foot (LF) and a grouting pay item measured by the cubic yard (CY). Included in these bid items are associated incidental costs such as:<br><ul> <li>Layout of a drilling pattern</li> <li>Instrumentation, monitoring and quality control</li></ul>Other costs associated with bulk infill grouting measured and paid for separately include:<br><ul> <li>Mobilization</li></ul><h2>Cost Information Summary</h2>Production rates for bulk infill grouting are highly variable, depending primarily upon the volume of voids to be filled and, to a lesser degree, on project specifics such as bore hole diameter and the method of grout injection (gravity or pressure). The following table lists items associated with the cost of bulk infill grouting and approximate cost ranges. Cost ranges are based on data from 2005 through 2010. Readers should carefully examine the project characteristics and constraints and determine to what degree if any these factors may influence the actual cost associated with bulk infill grouting.</p><p><table class='tablepress' id='tablepress-65'><thead><th>Pay Item Description</th><th>Quantity</th><th>Unit</th><th>Low Unit Price</th><th>High Unit Price</th><th>Factors Which May Potentially Impact Costs</th></thead><tbody><tr><td >Mobilization</td><td >1</td><td >LUMP
SUM </td><td >$5,000</td><td >$25,000</td><td >Equipment mobilized includes: drill rig(s),
compressor(s), and pumps
On-site mixing plants may be mobilized for volumes
greater than 5,000 cubic yards
Mobilization cost increases for distances greater than
500 miles
Phased projects may require multiple mobilizations</td></tr><tr><td >Drilling </td><td >Greater Than 500</td><td >LF</td><td >$10.00</td><td >$25.00</td><td >Density and hardness of the material being drilled will
affect the production rate
Abrasiveness of the material being drilled will impact
the cost of wear items</td></tr><tr><td >Grouting</td><td >500 to 25,000</td><td >CY</td><td >$75.00</td><td >$250.00</td><td >Grout cost is sensitive to the grout mixture proportions,
particularly the volume of portland cement required
per cubic yard
Local availability and freight cost should be considered
for filler materials such as sand and fly ash
Pressure grouting voids is more expensive than gravity
filling voids</td></tr></tbody></table><h2>Historical Cost Information</h2>A sample of actual project costs is shown in the table below.</p><p><table class='tablepress' id='tablepress-66'><thead><th>Pay Item Description</th><th>Quantity</th><th>Unit</th><th>Low Unit Price</th><th>High Unit Price</th><th>Average Unit Price</th><th>No. of Bids</th><th>Bid Date</th><th>Source/Agency</th></thead><tbody><tr><td >Misc. Drilling Inspection and Grouting Holes</td><td >7,475</td><td >LF</td><td >$19.00</td><td >n/a</td><td >n/a</td><td rowspan=3 >1</td><td rowspan=3 >12/18/2009</td><td rowspan=3 >Missouri DOT</td></tr><tr><td >Misc. High Slump Grout Material</td><td >7,325</td><td >CY</td><td >$55.00</td><td >n/a</td><td >n/a</td></tr><tr><td >Misc. Low Slump Grout Material</td><td >7,325</td><td >CY</td><td >$75.00</td><td >n/a</td><td >n/a</td></tr><tr><td >Misc. Flowable Fill for Infill</td><td >6,529</td><td >CY</td><td >$113.00</td><td >$120.00</td><td >$116.20</td><td >5</td><td >6/29/2005</td><td >Missouri DOT</td></tr><tr><td >Pressure Grout</td><td >1,500</td><td >CY</td><td >$80.80</td><td >$150.00</td><td >$113.09</td><td >7</td><td >3/7/2008</td><td >Michigan DOT</td></tr><tr><td >Drilling Holes for Pressure Grouting</td><td >308</td><td >EA</td><td >$306.00</td><td >n/a</td><td >n/a</td><td rowspan=3 >1</td><td rowspan=3 >4/30/2008</td><td rowspan=3 >Florida DOT</td></tr><tr><td >Pipe for Grout Installation</td><td >3,080</td><td >LF</td><td >$18.05</td><td >n/a</td><td >n/a</td></tr><tr><td >Pressure Grouting – Subsurface, Sand Cement Mix</td><td >161</td><td >CY</td><td >$328.00</td><td >n/a</td><td >n/a</td></tr></tbody></table><h2>Conceptual Cost Estimating Tool</h2>The conceptual cost estimating tool is intended to be used to develop a preliminary project scoping cost estimate. This preliminary estimate can be based on the typical construction cost item values as contained in the Cost Information product or from user specified cost values when such are known. Users should read and understand the information in Cost Information product prior to using the cost estimating tool. You can download the Cost Estimating Tool to open a cost estimating spreadsheet for producing a preliminary project scoping estimate.</p><p><a class="arrow-link" href="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/… the Cost Estimating Tool</a></p><p> </p></p>
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