<?xml version="1.0" encoding="utf-8"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>TRB Publications Index</title><link>http://pubsindex.trb.org/</link><atom:link href="http://pubsindex.trb.org/common/TRIS Suite/feeds/rss.aspx?tc=NN%3AQtptg%2A" rel="self" type="application/rss+xml" /><description></description><language>en-us</language><copyright>Copyright © 2015. National Academy of Sciences. All rights reserved.</copyright><docs>http://blogs.law.harvard.edu/tech/rss</docs><managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor><webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster><image><title>TRB Publications Index</title><url>http://pubsindex.trb.org/Images/PageHeader-wTitle.png</url><link>http://pubsindex.trb.org/</link></image><item><title>ENERGY LOSS IN LONG ROD PENETRATION TESTING - TERMINUS DAM LIQUEFACTION INVESTIGATION</title><link>http://pubsindex.trb.org/view/640013</link><description><![CDATA[In order to evaluate liquefaction potential at Terminus Dam, investigations consisting of Becker Penetration Testing, cross-hole shear wave velocity, and Standard Penetration Testing (SPT) were performed.  SPT drill rod lengths of up to 60 m (200 ft) were anticipated.  Measurements were made to evaluate the loss in transmitted energy in long drill rods in the SPT.  SPT tests were performed with a Mobile automatic hammer and NWJ drill rod.  Instrumented subassemblies were located at the top of the rod string and at varying locations in the bottom of the rod string to measure energy.  Energy loss was evaluated by determining the energy content in the incident wave pulse as a function of the length of the rods tested.  Test results indicate an energy loss rate of 1% per 3 m (10 ft) of rod.  The results indicate that for long drill rods, adjustments are required to SPT data.]]></description><pubDate>Wed, 01 Mar 2000 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/640013</guid></item><item><title>SAWED JOINTS IN CONCRETE PAVEMENTS: PROGRESS AND PROBLEMS</title><link>http://pubsindex.trb.org/view/102658</link><description><![CDATA[THE PRACTICE OF CUTTING JOINTS IN THE HARDENED CONCRETE BY MEANS OF SPECIAL SAWING EQUIPMENT OF VARIOUS MAKES UTILIZING DIAMOND OR SILICON CARBIDE BLADES OR DISCS IS DESCRIBED. THE PURPOSE OF EXPERIMENTING WITH SAWED JOINTS WAS TO FIND A TYPE OF JOINT THAT WOULD CAUSE SMOOTHER RIDING AND BE LESS SUBJECT TO SPALLING THAN THE CUSTOMARY FORMED JOINTS. IT HAS BEEN TRIED WITH APPARENT SUCCESS UPON A VARIETY OF PAVEMENT DESIGNS BOTH REINFORCED AND PLAIN WITH SLAB LENGTHS FROM 15 TO 100 FEET, BOTH WITH AND WITHOUT LOAD TRANSFER DEVICES OF VARIOUS DESIGNS. A VARIETY OF SAWING EQUIPMENT IS AVAILABLE FROM A NUMBER OF MANUFACTURERS. THE COST OF SAWING VARIES WITH DEPTH. COST ALSO DEPENDS UPON THE TYPE OF AGGREGATE, AGE OR HARDNESS OF CONCRETE MORTAR AT THE TIME OF SAWING, DEPTH OF CUT, TYPE OF EQUIPMENT AND SKILL OF OPERATORS. PROBLEMS IN REGARD TO JOINT SPACING, WIDTH OF CUT, AND SEALING AND CURING ARE DISCUSSED.]]></description><pubDate>Thu, 28 Apr 1994 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/102658</guid></item><item><title>EARLY AMERICAN TUNNELS</title><link>http://pubsindex.trb.org/view/60311</link><description><![CDATA[Tunnels built in the U.S. from the time of the earliest, 137-m Auburn Tunnel (1818-1821), and the Lebanon Tunnel (1824-1826) are noted, and comments are made on the tools used in tunneling.  By 1850, 48 tunnels were completed for both canals and railroads.  All these tunnels were in rock, hard and soft, and all required drilling and blasting. Until 1865 all drilling was done by hand and was called double jacking.  The drilling and balsting technique is briefly described.  During the period before 1850, the American method of tunneling was developed.  In this method, tunnels were driven heading and bench, the bench being about 2.4 m wide.  An important development during this period was the American System of timbering, which consisted of a five-piece arch erected on the heading on a wall plate if the ground needed support.  The pneumatic drill was used in 1875 and, with some improvements was used until about 1945. All mucking was by hand; either a short D-handled shovel was used or one with a long handle known as a muck stick.  A drill jumbo used on the Pennsylvania Turnpike is described which carried 8 drills mounted on hydraulically controlled booms.]]></description><pubDate>Wed, 29 Mar 1978 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/60311</guid></item><item><title>SAMPLING OF CONCRETE IN SERVICE</title><link>http://pubsindex.trb.org/view/102186</link><description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description><pubDate>Tue, 21 Jul 1970 00:00:00 GMT</pubDate><guid>http://pubsindex.trb.org/view/102186</guid></item></channel></rss>