Chemical Grouting/Injection Systems Cost Information

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><h2>Commentary</h2>Measurement and payment for chemical grouting should be based on the cubic yards (CY) of chemical grout required to stabilize the area treated. Included in this item are the necessary equipment, labor, materials, and quality assurance to perform the work in accordance with project specifications. Mobilization is paid for separately.<br><h2>Cost Information Summary</h2>Estimated costs for chemical grouting range from $1,000 per CY to $4,000 per CY depending upon the material used.

Chemical Grouting/Injection Systems Fact Sheet

Submitted by admin on Mon, 05/21/2018 - 19:41

<p><p><figure id='attachment_856' style='max-width:816px' class='caption aligncenter'><img class="wp-image-856 " style="border: 2px solid #696969;" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Diagram showing a tunnel protection scheme using injected grout under the tunnel to improve the soils underlying the tunnel." width="816" height="816&

Chemical Grouting/Injection Systems Specifications

Submitted by v.schaefer on Wed, 05/30/2018 - 19:09
Summary of Example Specifications

<p><p><h2> Summary of Example Specifications</h2><div class="grayed-title subsection"><strong>Specification Name/Number:</strong> Eastside LRT Project 02153-1 Ground Treatment</div><strong>Reference(s):<br></strong><em>Los Angeles County Metropolitan Transportation Authority</em></p><p>This specification gives guidance for grouting as a means of structural support during excavations. This specification limits grouts to the use of liquid sodium silicate or cement-based grouts. The specification covers all relevant components needed to ensure a successful grouting project and could be used as a guide in development of other project specifications for structural grouting projects. It is a well organized specification and is easy to follow. </p><p><div class="grayed-title subsection"><strong>Specification Name/Number:</strong> Guide Specification for Underpinning by Chemical Grouting</div><strong>Reference(s):<br></strong><em>Hayward Baker</em></p><p>This specification gives guidance for grouting as a means of structural support during excavations. This specification limits grouts to the use of liquid sodium silicate based grouts though modifications to the content could be made to allow information to be inserted for various other types of chemical grout. The specification covers all relevant components needed to ensure a successful grouting project and is intended to be used as a guide in development of other project specifications for structural grouting projects. This outline seems to be similar to that used in many highway and non-highway related specifications. This document is only a guide and Hayward Baker recommends tailoring specifications towards site specific conditions and design requirements. </p><p><div class="grayed-title subsection"><strong>Specification Name/Number:</strong> Specifications, Supervision, and Inspection</div><strong>Reference(s):<br></strong><em>Karol (2003)</em></p><p>This textbook is a comprehensive source for information related to chemical grouting both for structural improvement and water control. The information contained in this text is valuable for specification development. Chapter 21 of this text book titled “Specifications, Supervision, and Inspection” includes a variety of excerpts from various specifications, which can be used as models for specification writing. Also included in Chapter 21 are flow charts and recommendations as to what specifications should contain. This chapter also provides suggestions and strategies for supervision, which can be considered application of specifications. </p></p>

Excavation/Borehole Inspection

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Baker (1983)<br>Brachman et al. (2003)<br>Karol (2003)<br>Parish et al. (1983)<br>Waller et al. (1983)</em></p><p><strong>Method Summary</strong></p><p>Excavation or boring to the grout zone is an effective means of determining performance of the grout treatment for QA. In situ testing to determine performance properties such as bearing capacity and modulus can be conducted.

Field Sampling and Testing

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Dreese et al. (2003)<br>Karol (2003)<br>Lees and Chuaqui (2003)<br>Krizek et al. (1983)<br>Müller et al. (2000)</em></p><p><strong>Method Summary</strong></p><p>Regular sampling and testing for grout gel time, set time, specific gravity and viscosity improves consistency of the grout. This is primarily for QC which ensures that grout properties have not changed during the construction process.

Permeability

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Karol (2003)<br>Munfakah (1991)</em></p><p><strong>Method Summary</strong></p><p>Permeability measurements may be taken during grouting as QC measure and post construction as QA measure. Permeability measurements can be determined during grouting operations using water or the grouting medium as the permeating fluid.

Pressuremeter

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Baker et al. (1983)<br>Karol (2003)<br>Waller et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>The Pressuremeter Test (PMT) procedure is described in ASTM D4719-07. PMT is used to obtain the stress-strain response of the soil in-situ. A PMT modulus and a limit pressure value are obtained from this test. Preparation for the test starts with drilling a cavity or a bore hole to insert the PMT probe to the desired depth.

Pump/Injection Monitoring

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Baker (1983)<br>Brachman et al. (2003)<br>Bruce (1994)<br>Dreese et al. (2003)<br>Karol (2003)<br>Lees and Chuaqui (2003)<br>Müller et al. (2000)<br>Munfakah (1991)<br>Waller et al.

Radar Profiling

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Baker (1983)<br>Waller et al. (1983)</em></p><p><strong>Method Summary</strong></p><p>This method uses transmission of electromagnetic waves through the ground to define changes in soil stiffness and extent of the grout treated zone. Grouted soils attenuate the electromagnetic waves more than ungrouted soils. Surveys should be performed before grouting and after.

Seismic Testing

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Brachman et al. (2003)<br>Baker et al. (1983)<br>Parish et al. (1983)</em></p><p><strong>Method Summary</strong></p><p>This method measures transmission velocity of seismic waves through the ground to define changes in soil stiffness and extent of the grout treated zone. Grouted soils show increase in seismic wave transmission over ungrouted soils. Surveys should be performed before and after grouting.

Settlement/Heave

Submitted by admin on Wed, 05/30/2018 - 19:09

<p><p><strong>Reference(s):</strong></p><p><em>Karol (2003)<br>Parish et al. (1983)<br>Waller et al. (1983)</em></p><p><strong>Method Summary</strong></p><p>Measurement of settlement or heave can be performed with in-ground instrumentation or with surface survey. Heave or settlement control is vital to structural grouting applications such as underpinning of existing structures were excessive heave or settlement will damage these structures.