<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>EARLY HYDRATION BEHAVIOUR OF PORTLAND CEMENT CONTAINING CHEMICAL BY-PRODUCT GYPSUM</title>
      <link>https://trid.trb.org/View/173434</link>
      <description><![CDATA[Different types of chemical by-product gypsum are described and their influence upon the early hydration behaviour of portland cement is discussed.  When the portland cement contained by-product gypsum, more ettringite was formed than when natural gypsum was present.  No correlation was found between ettringite and setting behaviour. Compressive strength development was not adversely affected by the presence in portland cement of any of the by-product gypsums examined here.(a) (TRRL)]]></description>
      <pubDate>Tue, 22 Dec 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/173434</guid>
    </item>
    <item>
      <title>EARLY HYDRATION BEHAVIOUR OF PORTLAND CEMENT CONTAINING CHEMICAL BY-PRODUCT GYPSUM</title>
      <link>https://trid.trb.org/View/172506</link>
      <description><![CDATA[Different types of chemical by-product gypsum are described and their influence upon the early hydration behaviour of portland cement is discussed. When the portland cement contained by-product gypsum, more ettringite was formed than when natural gypsum was present. No correlation was found between ettringite and setting behaviour. Compressivestrength development was not adversely affected by the presence in portland cement of any of the by-product gypsumsexamined here.  (Author/TRRL)]]></description>
      <pubDate>Wed, 28 Oct 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/172506</guid>
    </item>
    <item>
      <title>THE INFLUENCE OF THE COMPOSITION OF INDUSTRIAL CLINKER ON CEMENT AND CONCRETE PROPERTIES</title>
      <link>https://trid.trb.org/View/172505</link>
      <description><![CDATA[The influence of chemical and mineralogical composition of clinker on cement and concrete properties is discussed, based on investigation of a large number of industrial clinkers. Of the various influences isolated it was found that the alkali compounds exert the greatest influence on the rate of hydration and hardening of cement. (Author/TRRL)]]></description>
      <pubDate>Wed, 28 Oct 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/172505</guid>
    </item>
    <item>
      <title>DETERMINATION OF THE URANIUM CONTENT IN INDIAN PORTLAND CEMENT BY NUCLEAR PARTICLE ETCH TECHNIQUE</title>
      <link>https://trid.trb.org/View/172507</link>
      <description><![CDATA[A nuclear particle etch technique has been applied to the trace determination of uranium in various Indian portland cement samples. Uniform and non-uniform distributions of uranium were found. Results indicate an average uranium concentration of 1-7 ppm in the homogeneous regions and 15-63 ppm in the heterogeneous regions, with an overall average value as high as 65.7 ppm.  (TRRL)]]></description>
      <pubDate>Wed, 28 Oct 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/172507</guid>
    </item>
    <item>
      <title>THE EFFECT OF COOLING RATE ON CEMENT PROPERTIES - A REVIEW</title>
      <link>https://trid.trb.org/View/161145</link>
      <description><![CDATA[The optimum cooling of cement clinker as it leaves the sintering zone is a subject of considerable interest in view of its bearing on the quality of clinker, conservation of energy and particularly the exploitation of low grade raw material for cement manufacture.  The various types of clinker coolers have been assessed with regard to the attainment of optimum cooling.  The earlier works reported in this field and future scope of work are indicated.(a) (TRRL)]]></description>
      <pubDate>Wed, 16 Sep 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/161145</guid>
    </item>
    <item>
      <title>SOME HYDRATION INVESTIGATIONS INVOLVING PORTLAND CEMENT - EFFECT OF CALCIUM CARBONATE SUBSTITUTION OF GYPSUM</title>
      <link>https://trid.trb.org/View/166667</link>
      <description><![CDATA[The effects of partially and fully replacing gypsum by limestone in portland cement under a variety of conditions have been examined.  Different grinding temperatures and two different base gypsum levels have been investigated to assess the effects on setting and compressive strength development.  Examination of early hydration up to two hours was carried out in order to elucidate the mechanism of chemical reaction in the presence of limestone and to compare this with reaction in the presence of gypsum.  The results showed that some substitution of gypsum by limestone is possible without deleteriously affecting setting behaviour and compressive strength development from three days to one year.  (Author/TRRL)]]></description>
      <pubDate>Sat, 15 Aug 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/166667</guid>
    </item>
    <item>
      <title>AUTOMATIC TESTING OF CEMENT STRENGTH</title>
      <link>https://trid.trb.org/View/87096</link>
      <description><![CDATA[An automatic cement strength testing machine called the Tonicomp is described.  Designed in desk form the machine automatically calculates from failure load the required strength values, mean values and standard deviations, producing a strip printout.  The machine is a combination of a flexural test load frame for loads up to 10000 n and a compression test load frame for loads up to 200 kn. The two testing functions have a common control unit, an automatic measured value logging system and a minicomputer with printout facilities.  Prism specimens can be tested in compression and bending to DIN, ISO and ASTM standards.  The machine is also suitable for compression testing 2 in cubes and 50 x 50 mm cylinder test specimens. A test sequence of three flexural tests and six compression tests, including printout of the results, can be completed in 11 min. /TRRL/]]></description>
      <pubDate>Wed, 11 Jul 1979 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/87096</guid>
    </item>
    <item>
      <title>DEVELOPMENTS IN HIGHWAY PAVEMENT ENGINEERING - 2. CHAPTER 2. AGGREGATES IN BASE CONSTRUCTION</title>
      <link>https://trid.trb.org/View/87110</link>
      <description><![CDATA[The road construction programme has resulted in high capital expenditure in the quarrying industry to modernise plants to cope with the high aggregate demand.  The metrication of the industry has caused few problems except for some single-sized aggregates.  The chapter discusses the revisions which have taken place in the specification for road and bridge works' since the 1963 edition, for granular sub-bases and roadbases, and the effect these have had on the materials.  Some problems associated with wet-mix macadam are discussed and suggestions made to overcome them. The uses of two waste materials, colliery shale and China clay sand, which occur in large quantities are described.(a) /TRRL/]]></description>
      <pubDate>Wed, 11 Jul 1979 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/87110</guid>
    </item>
    <item>
      <title>AN ATTEMPT TO ASSESS BENEFICIAL AND DETRIMENTAL EFFECTS OF ALUMINATE IN THE CEMENT ON CONCRETE PERFORMANCE - PART 2</title>
      <link>https://trid.trb.org/View/80909</link>
      <description><![CDATA[Consideration is given to the effects of aluminate on the heat of hydration, shrinkage, sulphate resistance, durability and lump formation.  In each case extensive references are given to the results of research performed by other research workers in this subject.  The least controversial issue is considered to be on the heat of hydration, with research results indicating that the cement richest in aluminate emits the highest heat of hydration. Changes in shrinkage are considered to be far larger when measured on paste than on concrete specimens.  But the results of tests following measurements on the effects of an increase of aluminate from 5 to 12 per cent on non-restrained shrinkage indicate that the contribution of the aluminate to the shrinkage of concrete is negligible. Results are quoted which indicate that the vulnerability of pastes and mortars to sulphate attack increases with increasing aluminate content of the cement used.  However, it is suggested that test conditions have an effect on the results, and data obtained by different methods are presented in graphical form to illustrate this point. The method of test is also considered to affect the assessment of various factors on the durability of concrete, but even so observations are quoted that indicate that the lower the aluminate content the better the durability of the concrete. Similar reasoning also applies to the question of lump formation.  In conclusion the authors suggest that present knowledge of the subject is far from complete.  On balance, assessments of the effects of aluminate indicate that most effects are undesirable. However, the existence of some of them is felt to be questionable, and most of them are only considered to be important under special conditions. /TRRL/]]></description>
      <pubDate>Wed, 14 Mar 1979 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/80909</guid>
    </item>
    <item>
      <title>AN ATTEMPT TO ASSESS BENEFICIAL AND DETRIMENTAL EFFECTS OF ALUMINATE IN THE CEMENT ON CONCRETE PERFORMANCE - PART 1</title>
      <link>https://trid.trb.org/View/74002</link>
      <description><![CDATA[This paper is a slightly modified version of that presented at the Cembureau seminar on reactions of aluminates during the setting of cement, on 13-14 April 1977 at the Eindhoven University of Technology, Netherlands.  Since the cement producer is often confronted with the question of whether the c3a content is adequate or not, an attempt has been made to identify the benefits and drawbacks of altering the c3a level of the cement from the point of view of the user as well as that of the producer.  Some methodological difficulties (quantitative determination of the c3a and its polymorphism, comparableness of test conditions) may encroach upon the validity of the findings. /TRRL/]]></description>
      <pubDate>Wed, 27 Sep 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/74002</guid>
    </item>
    <item>
      <title>SLAG/FLY ASH CEMENTS</title>
      <link>https://trid.trb.org/View/72936</link>
      <description><![CDATA[Investigations have been carried out of cements made from a combination of finely ground blastfurnace slag or synthetic granulate with untreated fly ash using sodium hydroxide solution as activator.  Using a combination of 60% slag and 40% fly ash with 7% naoh (relative to combined weight of slag and ash) as activator, concrete has been prepared and tested for compressive strength up to an age of one year. Early strength properties were good but there was little gain in strength beyond 28 days though improved strength might be obtained by varying the proportions of slag and ash or by increasing the fineness of the slag.  Whatever cements' of this type have to offer in the way of useful properties is unlikely to be outweighed by the difficulties of handling a strongly alkaline material on site, the risk of alkaline-aggregate reaction and the possibility of efflorescence. /Author/TRRL/]]></description>
      <pubDate>Sat, 29 Jul 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/72936</guid>
    </item>
    <item>
      <title>THE INFLUENCE OF SO3 CONTENT ON THE BEHAVIOUR OF PORTLAND CEMENT MORTARS</title>
      <link>https://trid.trb.org/View/59622</link>
      <description><![CDATA[This review of the literature on the infleunce of gypsum content upon the early age behavior of cement pastes and mortars, shows that the SO3 content above which excessive expansions may occur is not related to C3A content but is related either to cement fineness, or, less probably to alkali content.  These findings relate to portland cements obtained by methods relating to retardation, minimum shrinkage, maximum strength, and "no excess expansion".  The findings relate to the SO3 content above which an expansion in excess of 100 and 200 micro-strains was observed to occur in a range of mortars stored under water from 24 h to 7 days.  It is suggested that if more than one SO3 content limit is specified in the Cement Standards for ordinary and rapid hardening portland cements, then the limits should be based upon cement fineness only.]]></description>
      <pubDate>Thu, 08 Dec 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/59622</guid>
    </item>
  </channel>
</rss>