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Available Resources
Mix Design Practices for Warm-Mix Asphalt PDF Print E-mail
Written by Randy Post   
Thursday, 02 June 2011 05:46

Mix Design Practices for Warm-Mix Asphalt from TRB

TRB's National Cooperative Highway Research Program (NCHRP) Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies.

Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at temperatures approximately 50°F (28°C) or more cooler than typically used in the production of hot mix asphalt (HMA). The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. [Source: TRB. Image: TRB]

Last Updated on Thursday, 02 June 2011 12:47
 
ADSC Rock-Socketed Drilled Shafts in the SE Research Project Site No.2 PDF Print E-mail
Written by Randy Post   
Tuesday, 31 May 2011 15:08
Test boring at the rock-socket test site

A research project sponsored by the SE chapter of ADSC is back on track and preparing for more field tests of rock-socketed drilled shafts in rocks of the Piedmont. Click through to Dan Brown and Associates for more details. [Source: Dan Brown and Associates, PC. Image: DBA]

 
Evaluation of Bridge Scour Research: Geomorphic Processes and Predictions PDF Print E-mail
Written by Randy Post   
Monday, 23 May 2011 23:46

Evaluation of Bridge Scour Research: Geomorphic Processes and Predictions

TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 177: Evaluation of Bridge Scour Research: Geomorphic Processes and Predictions explores the impact of long-term aggradation and degradation, and lateral river channel migration, on highway structures. [Source: TRB. Image: TRB]

Last Updated on Saturday, 21 May 2011 13:53
 
Recycled Rubber in Various Engineering Applications PDF Print E-mail
Written by Randy Post   
Tuesday, 10 May 2011 18:27
Used tires ready for recycling

Recycled rubber from tires has been used in various civil engineering projects. The California Department of Resources Recycling and Recovery (CalRecycle) promotes these uses which included RAC or rubberized asphaltic concrete as a friction enhancing and noise mitigation top layer on roadways. But there are other uses for the material as well. Tire-derived aggregate or TDA can be used as a lightweight backfill material to reduce loading on existing structures or lower driving forces on landslides and etc. Finally, the article describes how TDA was used for vibration mitigation under the subbase for a light rail line. [Source: Recycling Today via ASCE SmartBrief. Image: Tire Recycling]

 
HP16 and HP18 Steel H-piles Now Available PDF Print E-mail
Written by Randy Post   
Friday, 04 March 2011 06:20
Steel H-Pile

Up until recently, the biggest steel H-Pile section you could get was an HP14 weighing up to 177 lb/ft. But ENR reports that manufacturers are now rolling steel H-Piles in 16 and 18 inch depths. The HP16 sections range from 88 to 183 lb/ft and the HP18 are available in 135 to 204 lb/ft. These new sections open up a range of possibilities for deep foundations, shoring systems and excavation bracing. The American Institute of Steel Construction listed these products in their 2010 manual and they have also been approved by ASTM. They can be found in the product literature of Nucor-Yamato Steel. [Source: ENR. Image: http://taesancorporation.trustpass.alibaba.com/productshowimg/111392582-101499462/H_Bearing_Pile.html]

 
Get notified when there's new Google Earth and Google Maps imagery in areas you specify PDF Print E-mail
Written by Randy Post   
Monday, 21 February 2011 08:04
Cool Google Earth icon

Google has launched a new beta service called Follow Your World that allows you to be notified by email when they add new imagery to an area or areas you specify. You could use it to find out when new imagery of your neighborhood is added, or monitor a project site or other interesting area. The folks at GEarth Blog don't think Google will use the tool to determine what areas to focus on for obtaining new imagery, but you never can tell. [Source: Google Earth Blog. Image: geolocation.kmz.me]

 
FHWA Document: Hollow Bar Soil Nails Review of Corrosion Factors and Mitigation Practice PDF Print E-mail
Written by Randy Post   
Monday, 21 February 2011 08:02
FHWA CFL Hollow Bar Soil Nails - Review of Corrosion Factors and Mitigation Practice, August 2010

An August 2010 FHWA Central Federal Lands report on corrosion of hollow bar soil nails has recently been made available on the NCS Consultants, LLC website. The authors of the report are Naresh Samtani and Ed Nowatzki of NCS. From the abstract:

Hollow bar soil nails (HBSNs) have been used in the United States in earth retention systems for over 10 years. HBSNs are commonly used in place of solid bar soil nails (SBSNs) when the solid bar installation would require temporary casing of the hole. A state-of-the-practice document was prepared by FHWA in 2006 to identify (a) the various peculiarities of HBSNs in comparison with conventional SBSNs, and (b) areas of further research, evaluation and testing that would help agency personnel and design professionals understand the potential of HBSNs as a mainstream technology for permanent soil nail applications. This report concentrates on one of the specific areas of study identified in the 2006 report as related to development of corrosion mitigation guidance.

This report presents the results of an industry-wide survey including agencies, designers, consultants, manufacturers and contractors related to installation of HBSNs and practices with respect to corrosion aspects. Based on the responses it was found that a lack of guidance on corrosion protection is limiting the use of HBSNs for permanent applications in corrosive environments. There are numerous contributing factors that may lead to corrosion of HBSNs. These factors are identified in this report along with a review of the current corrosion mitigation guidance. Parameters to be evaluated in formal corrosion studies are outlined. Finally, recommendations for interim corrosion mitigation guidance and further studies are provided.
[Source: NCS Consultants, LLC. Image: FHWA]

 
New FHWA Document: Geosynthetic Reinforced Soil Integrated Bridge System Interim Implementation Guide PDF Print E-mail
Written by Randy Post   
Tuesday, 15 February 2011 05:33
GRS Bridge Abutment

The FHWA Turner-Fairbanks Highway Research Center has issued a document to provide interim guidance on the implementation of Geosynthetic Reinforced Soil or GRS Bridge Systems. From the foreward:

Geosynthetic Reinforced Soil (GRS) technology consists of closely-spaced layers of geosynthetic reinforcement and compacted granular fill material. GRS has been used for a variety of earthwork applications since the U.S. Forest Service first used it to build walls for roads in steep mountain terrain in the 1970s. Since then, the technology has evolved into the GRS Integrated Bridge System (IBS), a fast, cost-effective method of bridge support that blends the roadway into the superstructure. GRS-IBS includes a reinforced soil foundation, a GRS abutment, and a GRS integrated approach. The application of IBS has several advantages. The system is easy to design and economically construct. It can be built in variable weather conditions with readily available labor, materials, and equipment and can easily be modified in the field. This method has significant value when employed for small, single span structures meeting the criteria described in this report.

As a result of the demonstrated performance of GRS-IBS, the technology was selected for the Federal Highway Administration’s (FHWA) Every Day Counts initiative, aimed at accelerating implementation of proven, market-ready technologies. This report is the second in a two-part series and provides the background and other supporting information to substantiate the design method of GRS-IBS. The first document is a manual covering the design and construction of GRS-IBS. This two-part document series designs GRS as a composite material with known and predictable performance and deformations. Both documents are a collaboration between many disciplines within FHWA: geotechnical, structural, hydraulic, maintenance, and pavement engineering.
[Source: FHWA via Geosynthetica.net News. Image: FHWA]

 
Rudolph Glossop and the Rise of Geotechnology by Ronald E. Williams PDF Print E-mail
Written by Randy Post   
Sunday, 13 February 2011 16:43
Rudolph Glossop (1902 - 1993)

A new book that may be of interest to folks. See the Geoengineer.org link for more info.

A personal account of the role played by Rudolph Glossop, one of the founders of geotechnical engineering in the UK. Based upon previously unpublished personal journals, diaries and letters including correspondence with Bjerrum, Skempton and Terzaghi.
[Source: Geoengineer.org. Image: UK Geological Society]

 
DHS and ASDSO Launch New Interactive Website on Dam Security PDF Print E-mail
Written by Randy Post   
Thursday, 10 February 2011 15:02
Possible results of a natural dam threat such as over-topping or structural failure of the dam

'Dams Sector facilities provide a host of benefits, from flood protection to crop irrigation; however, the potential for their failure also presents a source of great danger with disastrous consequences. To avoid failures, it is critical that we are aware of possible threats, observant in the protection of our infrastructure, and prepared to act if threat indicators are present.' [Source: ADSO. Image: ADSO]

 
NCHRP Report: Intelligent Soil Compaction Systems PDF Print E-mail
Written by Randy Post   
Tuesday, 08 February 2011 05:23
NCHRP Report 676: Intelligent Soil Compaction Systems

TRB’s National Cooperative Highway Research Program (NCHRP) Report 676: Intelligent Soil Compaction Systems explores intelligent compaction, a new method of achieving and documenting compaction requirements. Intelligent compaction uses continuous compaction-roller vibration monitoring to assess mechanistic soil properties, continuous modification/adaptation of roller vibration amplitude and frequency to ensure optimum compaction, and full-time monitoring by an integrated global positioning system to provide a complete GPS-based record of the compacted area. [Source: TRB. Image: TRB]

 
Geo-Legend T. William Lambe PDF Print E-mail
Written by Randy Post   
Friday, 28 January 2011 05:45
T. William Lambe - Renowned Geotechnical Engineer, 'Geo-Legend'

In recent Geo-Strata magazines published by the ASCE's Geo-Institute, there is a new recurring feature called 'Geo-Legends' where a student interviews a well known person in the field of geotechnical engineering. The second in the series was written on T. William Lambe, among many other things, he was the co-author of two books with Bob Witman, Soil Testing and Soil Mechanics. Below is one of my favorite Q&A's from the article:

Q: Do engineers depend too much on technology today?
I think the fundamentals are by far the most important. Most of the problems and failures that I see are not from lack of sophisticated analysis, but from not understanding and using the fundamentals.

You can download a text version of the interview from the link below.

[Source: Geo-Institute. Image: NC State University]

 
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