<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
  <channel>
    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
    <description></description>
    <language>en-us</language>
    <copyright>Copyright © 2026. 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>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
    </image>
    <item>
      <title>PHOSPHORIC ACID STABILIZATION OF FINE-GRAINED SOILS: IMPROVEMENTS WITH SECONDARY ADDITIVES</title>
      <link>https://trid.trb.org/View/122447</link>
      <description><![CDATA[SEVERAL TECHNIQUES FOR IMPROVING, OR REDUCING THE COST, OF PHOSPHORIC ACID STABILIZATION OF A CLAYEY SILT AND A HEAVY CLAY HAVE BEEN EXAMINED. WITH THE CLAYEY SILT, TREATMENT WITH MIXTURES OF CALCIUM PHOSPHATE, OR PULVERIZED FLORIDA PHOSPHATE ROCK, AND SULFURIC ACID YIELDS HUMID CURE STRENGTHS GREATER THAN WITH THE EQUIVALENT AMOUNT OF PHOSPHORIC ACID, BUT LOWER IMMERSED STRENGTHS. USING PHOSPHATE ROCK, HOWEVER, THE REDUCTION IN COST OF STABILIZATION IS SO GREAT THAT HIGHER CONCENTRATIONS OF THIS MIXTURE CAN BE USED TO PRODUCE SATISFACTORY STABILIZATION AT A COST COMPETITIVE WITH CONVENTIONAL STABILIZERS. GRANULAR, ORTHORHOMBIC PHOSPHORUS PENTOXIDE CAN BE USED TO STABILIZE CLAYEY SILT AS EFFECTIVELY AS PHOSPHORIC ACID OR ORDINARY PHOSPHORIC OXIDE, AND WITH POTENTIALLY GREATER FIELD- CONVENIENCE. TRACE AMOUNTS (0.1 PERCENT OF SOIL) OF THIS COMPOUND FUNCTION AS AN EXCELLENT SOIL-DISPERSANT, AND WHEN USED IN CONJUNCTION WITH PHOSPHORIC ACID OR PHOSPHATE ROCK- SULFURIC MIXTURES, GREATLY INCREASE COMPACTED DENSITY AND STRENGTH. FERRIC CHORIDE, AT 1.6 PERCENT ON SOIL, IS AS EFFECTIVE A WATERPROOFER FOR PHOSPHORIC-ACID-STABILIZED HEAVY CLAY AS 0.5 PERCENT OCTYLAMINE. ALTHOUGH THIS SUBSTITUTION BRINGS ABOUT A SUBSTANTIAL REDUCTION IN STABILIZATION COST, THE MATERIALS COSTS FOR VERY HEAVY CLAY STABILIZATION ARE STILL TOO HIGH TO BE ATTRACTIVE FOR ALL BUT EMERGENCY SITUATIONS. DEVELOPMENT OF AN INEXPENSIVE, HIGHLY EFFECTIVE WATERPROOFER MAY BROADEN THE USEFULNESS OF PHOSPHORIC ACID IN SUCH SOILS. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:43:30 GMT</pubDate>
      <guid>https://trid.trb.org/View/122447</guid>
    </item>
    <item>
      <title>EFFECT OF SALT ADDITIVES ON CONCRETE DEGRADATION (PHASE II). EXECUTIVE SUMMARY</title>
      <link>https://trid.trb.org/View/460886</link>
      <description><![CDATA[This research builds on a previous investigation, which found that corrosion-inhibitor-added deicing salts caused degradation of concrete by both anions and cations.  The latest research phase looked at methods to detect the chemical reactions between concrete and corrosion-inhibitor-added deicing salts, and to determine the chemical compositions of the precipitates formed by chemical reactions between concrete and the corrosion-inhibitor-added deicing salts.  The research led to the following conclusions:  a simple method was developed for the detection of chemical reactions between deicing chemicals and concrete; the results provided clear evidence of the chemical reactions between concrete and the corrosion-inhibitor-added deicing salts; the different amounts of precipitates (chemical reaction products) found in the test cells were dependent on the type and concentration of corrosion-inhibitor-added deicing salts; precipitates formed by chemical reactions between deicing chemicals and concrete were identified by using chemical analysis, scanning electron microscopy, and X-ray diffraction analysis; and precipitates were calcium and/or magnesium phosphates as a major component, and gypsum as a minor component.]]></description>
      <pubDate>Thu, 12 Sep 1996 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/460886</guid>
    </item>
    <item>
      <title>DEVELOPMENT OF STRENGTH IN CEMENTS</title>
      <link>https://trid.trb.org/View/169625</link>
      <description><![CDATA[This report is divided into two parts: Portland and Sorel Cements. Portland Cement: The production of doped belite (dicalcium silicate) clinkers can be a prospective way of saving energy in cement production. Barium sulfate (BaSO sub-4), calcium tribasic phosphate (Ca sub-5 (PO sub-4) sub-3 (OH), and vanadium oxide (V sub-2 0 sub-5) stabilize Beta-, alpha' and alpha modifications of belite (C sub-2 S). The aplha' modification shows better strength development than the Beta-C sub-2 S. Strength develops more slowly in Ca sub-5 (PO sub-4) sub-3 OH than in BaSO sub-4, stabilized belites. Also, belite clinkers doped with BaSO sub-4 attain greater strength than belites without BaSO sub-4. Sorel Cement: The reaction products are dependent on the proportion of reactants (MgO, MgC1 sub-2, and H sub-2 O) and on MgO activity. Hardened cements achieve the best strength development and stability when phase 5 (5Mg (OH) sub-2 .MgC1 sub-2 .(H sub-2 O) is the main reaction product.  Phosphate addition, especially soluble phosphates, which are more effective, improves the cement's resistance to the effects of water. (FHWA)]]></description>
      <pubDate>Tue, 22 Dec 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/169625</guid>
    </item>
    <item>
      <title>WEIGHTS AND MEASURES: NEW CHALLENGES IN TODAY'S MARKETPLACE</title>
      <link>https://trid.trb.org/View/66041</link>
      <description><![CDATA[The compounds calcium sulfoaluminate, spurrite and Measures, the acting director, Dr. Ambler, stressed the during the heating of kiln feed in the manufacture of portland cement.  It has also been demonstrated that these compounds were formed by a gas-solid reaction between CO2 ideas and technology.  Today the metric system is the language of economic communication, and the nation has committed itself to the conversion.  In order to assist the public and eliminate any misunderstanding involved in this completely prevented formation of spurrite, addition of up to 1% P205 as calcium hposphate to the kiln feed did not adversely affect strengths of a commerical cement. Legal Metrology (OIML) will foster the country's stance in international commerce.  The incorporation of new technologies into business will require changes in the measurement system that must be handled in such a way that the consumer feels that his needs are satisfied.  Consumer concerns are of primary importance at NBS, where product safety tests are developed for the protection and knowledge of consumers.  These three major concerns- metrication, new technology, and consumer interest-are the areas in which NBS is concentrating its efforts.  Priorities in weights and measures will be determined for the optimum use of available resources.  1112A4100      149588EEJAPC10000000]]></description>
      <pubDate>Wed, 13 Apr 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/66041</guid>
    </item>
    <item>
      <title>CRITICAL PH SCALING INDEXES</title>
      <link>https://trid.trb.org/View/34124</link>
      <description><![CDATA[The effect on the critical pH of calcium carbonate scaling of ions such as magnesium and sulfate is explored and critical pH values for other slightly soluble salts of concern in cooling water applications are reported.  Data presented for calcium sulfate indicate that between 5 and 10 times the solubility product concentrations are required before precipitation begins, for calcium carbonate about 35 times the solubility product concentration is needed, and for calcium phosphate the factor is about 1000.  In the order presented, these calcium salts are less soluble than their predecessor and the lower the solubility, the greater is the relative amount of supersaturation required to initiate precipitation and scale formation.]]></description>
      <pubDate>Sat, 18 Oct 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/34124</guid>
    </item>
  </channel>
</rss>