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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>CONSTRUCTION AND MAINTENANCE OF RIGID PAVEMENTS. REPORT FROM INDIA --PIARC XVIII WORLD ROAD CONGRESS, BRUSSELS, BELGIUM, SEPTEMBER 13-19, 1987</title>
      <link>https://trid.trb.org/View/296600</link>
      <description><![CDATA[Research has been carried out in the following areas: (1) design and behaviour in service -a number of studies and investigations have been conducted on pavements for tracked vehicles, continuously reinforced concrete pavements, fibre reinforced concrete, vacuum concrete, prestressed concrete pavements, and precast concrete pavement for rural roads and desert areas.  The nature of support provided by cracked concrete slabs to overlay pavements is under study. Satisfactory techno-economic performance has been reported for a 20 year old adequately designed rigid pavement on a national highway, a heavy duty reinforced concrete pavement over bitumen-sheeting encased black cotton soil constructed in the sixties, and urban heavy duty pavement sections laid with prestressed concrete in 1967 and continuously reinforced concrete in 1981-82.  A number of pavement designs have been constructed in the recent past for heavy duty dumpers of a capacity up to 170 tonnes; (2) materials - studies have been undertaken of the advantages and disadvantages of the portland pozzolanic cement (ppc) vis-a-vis ordinary portland cement (opc).  The results available indicate relatively higher specific creep and relatively lower performance when super-plasticisers are used in ppc concrete.  Coral aggregates have been successfully used as bound material in base courses and as aggregate in concrete; (3) construction and control - surface evenness is achieved by floating and belting and checking with 3 m straight-edge.  Power operated floor finishers are used on experimental construction.  Coir broom and light wire brushing are found suitable for surface texturing.  Recently formulated central public works department criteria provide for limited acceptance of cracks in new airfield pavements; (4) maintenance and rehabilitation -pavement condition assessment is done on the basis of surface defects, surface unevenness and structural tests.  Qualitative intervention thresholds are recognised. Non-destructive evaluation techniques utilised include repetitive dynamic load testing, lcn tests to incipient cracking.  Benkelman beam test, and surface wave propagation technique.  Simple equipment has been developed for grout jacking of settled slab without resorting to high pressure. Synthetic resin is used for the repair of local surface defects.  A number of techniques, including the use of geotextiles, have been used for the inhibition of reflected cracking in bituminous overlays.  Drainage has also received attention.  Studies of the use of recycled concrete as aggregate for concrete mixes have shown the feasibility of marginal economy over the use of new aggregates; (5) subbases and road bases treated with hydraulic binders -the concept of semi-rigid pavement technology as an alternative to granular bases and subbases has been successfully adopted on experimental sections, using lean cement concrete and lean cement flyash concrete.]]></description>
      <pubDate>Sun, 30 Apr 1989 00:00:00 GMT</pubDate>
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      <title>CONSTRUCTION AND PERFORMANCE OF THE STABILIZED BASE COURSE ON U.S. 77 PONCA CITY, KAY COUNTY. FINAL REPORT</title>
      <link>https://trid.trb.org/View/275363</link>
      <description><![CDATA[This study investigates the field implementation of shale stabilization on an experimental project.  A number of test sections were set on the south bound lane of U.S. Highway 77, north of Ponca City, Kay County, Oklahoma.  To compare the effectiveness of various stabilizing agents, the base courses of these test sections were stabilized with cement (14%), quicklime (4.5%), fly ash (25%), and an optimum mixture of 8% cement plus 3% quicklime plus 18% fly ash used conjunctively.  Also a control (non-stabilized) section was set as a reference section.  Analyses of the samples prepared during construction and those cored from under the pavement after construction showed significant amelioration of the engineering properties of stabilized shale as manifested by their plasticity, compressive and beam strength compared to raw (non-stabilized) shale.  Benkelman beam measurements ascertained the improvement in deformation resistance.  The microstructure of stabilized shale was studied using X-ray diffraction (XRD).  The non basal (hkl) reflections in stabilized oriented specimens suggest that the clay particles in the stabilized shale acquired high resistance to dispersive forces.  This, together with the reduction in the integrated intensities of clay minerals help explain the improved stability as a result of stabilization.  SEM observations in conjunction with EDS, depicted the presence of some newly formed hydration products and a rather dense degree of packing.  The various data converge to the conclusion that field stabilization is a viable solution to the use of expansive shales.]]></description>
      <pubDate>Mon, 29 Feb 1988 00:00:00 GMT</pubDate>
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      <title>STABILIZATION SEMINAR 1978--PAPERS AND REPORT</title>
      <link>https://trid.trb.org/View/154312</link>
      <description><![CDATA[The papers presented at this seminar deal with the various methods of upgrading subgrade, subbase and aggregate courses in use throughout New Zealand to get around the high cost of petroleum products and its effect on the cost of aggregate production and transport.  Among the topics discussed are lime stabilization of subgrades, subbases, and bases; an experimental soil cement pavement; a pavement design incorporating lime and cement stabilized layers; and laboratory testing and quality control of stabilized materials.]]></description>
      <pubDate>Wed, 18 Feb 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/154312</guid>
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      <title>STUDIES OF THE USE OF FLY-ASH FOR ROAD PAVEMENTS</title>
      <link>https://trid.trb.org/View/21750</link>
      <description><![CDATA[With a view to analyzing the possibility of using fly-ash from the thermal station of Tapado do Outeiro in road pavements, it was decided to construct some experimental sections in which fly-ash would be used as a soil stabilizing agent.  For one of the sections, the ash was used mixed with lime; in the third section used for reference purposes, nothing was added to the soil (a clayey residual soil).  Simultaneous laboratory studies were conducted to control the compaction of the stabilized base-courses and observe their behaviour by means of in-situ CBR tests and simple compression tests on specimens taken from the pavements, both tests being carried out at 28 and at 90 days.  The results obtained are discussed taking into account the construction and loading conditions of the experimental sections and the aims of the study.]]></description>
      <pubDate>Wed, 26 Mar 1975 00:00:00 GMT</pubDate>
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