Until a few years ago, interest in the incorporation of fly ash into lean concrete was rather limited. A study conducted in the laboratory has demonstrated some of the advantages of the technique and shown that the optimum dosage is of the order of5 %. In Belgium, mixtures of this...
Some Theoretical and Practical Aspects of the Use of Fly Ash in Lean Concrete
The Chemical Characterization of Admixtures For Cement Concrete
Although the Belgian standards provide for quality control of idrnixtures for cement concrete, it is interesting to complement his information by a more thorough chemical identification. this makes it possible to increase the economic advantages vhich result from their use. nfrared spectrographic investigation, which enables the ategory of basic chemical...
Specific Deterioration of Construction Joints in Continuously Reinforced Concrete Pavements_ Under Very Hot Weather Conditions
Generally due to an unsufficient vibration, the concrete around the construction joints may contain cavities, especially under the reinforcement. When very hot weather conditions prevail, these deficiencies may cause important deteriorations, possibly with mere fragmentation of the concrete around the joint. As there are over 5.000 construction joints on the...
Lime-Cement Stabilization of Wet Cohesive Soils
When treated with lime, wet cohesive soils granulate and be-ome more workable, thus allowing easier subsequent incor-oration of cement.'he effects of pregranulation with lime on various aspects ofement stabilization were investigated: compaction. CBR bear-19 capacity, strength values, durability, the effects of differentariables such as density and moulding moisture content. Theitter...
Dependable Production of Air-Entrained Concrete with High Resistance to Freezing and Thawing in the Presente of De-Icing Salt For Road and Bridge Construction
To ensure that concrete has a high resistance to freezing and thawing it must contain small air voids which are produced by an air-entraining agent and which must be present in sufficient quantities to match the amount of fine mortar. The limits for the air content of unset concrete and...
Rapid Reconstruction of Concrete Slabs on Airfield Runways
The rapid reconstruction of concrete slabs on airfield runways is a technology presented to airports operation authorities in order to strictly shorten the reparation period when the runway is unpracticable. The French airports and airbases engineering services proceeded with two demonstration works on the BORDEAUX and NlMES airports. The reconstruction...
Aspects of Mechanistic Analysis of Lightly Cementitious Pavement Materials
Inthispaper compressionfailureasa resultof traffic loading in lightly cementitious pavement ma-terials is discussed. The investigation was donewith the aid of mechanistic analysis, and includesboth surface and depth deflection measurementson an actual pavement from which linear elasticmoduli values were backcaIculated. This wasdone to evaluate the «actual» stresses between therelatively thin surfacing and...
The Brite Project on the Freeze/Thaw Durability of Concrete Block Paving
The prime objective of this programme is to develop an ac-zelerated freeze/thaw performance test that relates reliably tofield performance.Samples of 40 experimental block mixes have been placed onone or more of 5 exposure sites. Data from meteorologicalstations on these sites are being used to model the relationshipbetween ambient conditions and...
Cement Concrete Pavement on Granular Base Course of Graduated Concrete-Recycling-Ma Terlal
The hitherto used standard building method using hydraulic bound regulating and base course has been criticised for frequently faiîing. If existing concrete pavements are rehabilitated, the old road structures have to be involved into the new wearing system, so that the required bearing capacity E, ~ 50 Nz'mnr' may be...
Economic Analysis of Cement Fly Ash Bound Materials
In order to design a cement bound mixture for use in base/sub-base pavement layers, it isusually re-quired to obtain a certain minimun strength value.Ifonly one type of binder isused, the problem hasonly one restriction and one variable, so, one onlysolution. However, if more binders are added tothe mixture, asit happens...
The Use of Seismic Tests to Assess the Properties of Portland Cement Concrete During Curing
«In situ» measurements of surface wavevelocityon two prototype concrete slabs indicate that seismic measurements offer a reliable alternative to con-ventional penetration resistance and cylinder com-pression tests for determining the stiffness of Port-land cement concrete during curing. The surfacewave velocity was determined using a nondestruc-tiveand nonintrusive technique called the SpectralAnalysis of...
Interaction Between Mix Design Construction and Properties For RCCP
When roller-compacted concrete pavements (ReePi :11' u-cd ill Sweden, they are always used as a wear cour-e. Evpenenee shows that RCCP which have been laid meet the functional requirements. Carefully executed quality control is important for the results. Consequently two new lest methods. the Kango (cube) and the RA methods....