... far exceeds these uses. This paper emphasizes another technically and economically attractive option, which is the use of recycled tire rubber in portland cement concrete. Preliminary studies show that workable rubberized portland cement concrete (rubcrete) mixtures can be made provided...

... high-volume fly ash shotcrete produced had satisfactory workability, mechanical properties, and resistance to freezing and thawing cycling. The shotcrete containing silica fume had negligible rebound compared with that without silica fume. The incorporation of fly ash and silica fume improved...

... arrived at using the Generalized Approach for Mix Proportioning. The method proposed was applied to and found applicable for fly-ash concretes using fly ashes from two different sources. KEYWORDS: fly ash, mix proportioning, Generalized Approach for Mix Proportioning, workability, strength Chemical...

...SW Tresouthick; VS Dubovoy; JW Gajda The ability to accurately determine the workability and board life of mortars has been an important goal of the cement industry. This paper describes a new approach for more accurate determinations of the workability and board life, as well as other mortar...

... as workability, unit weight, and volume change were examined. Rubberized concrete was found to possess acceptable workability and a smaller unit weight than plain concrete. Volume change of rubberized concrete specimens containing 38, 25, and 19-mm rubber aggregates was found to be larger than that of plain...

... concrete—4900 to 5910 psi (33 to 42 MPa) after 28 days. No adverse effects on concrete strength were observed. Instead, the pellets, being round in shape, enhanced the workability of concrete and resulted in more compact concrete specimens. The net result of substituting the pellets for coarse aggregates...

... as adhesion promoters and are capable of rendering the concrete hydrophobic. Concretes made with aggregates that were pretreated with silanes generally showed a dramatic increase in strength under both dry and wet conditions. KEYWORDS: sulphur, concretes, aggregates, concrete strength, density, workability...

...P Balaguru; V Ramakrishnan In this paper, two popular measures of workability, namely, slump and V-B time, are compared for plain and steel (hooked) fiber-reinforced concrete. The results are based on experiments made on both types of concrete with and without high-range, water-reducing admixture...

... on the workability of different mixes and the slump loss with time was also measured. admixtures mechanical properties superplasticizers compressive strength modulus of elasticity flexural strength tensile strength slump workability high-strength concrete concrete water-reducing agents References...

...C Atzeni; L Massidda; U Sanna With a view to establishing a relationship between the rheological behavior of cement pastes with varying water/cement ( W/C ) ratios and the workability of different mortars, rotoviscosimetric (hysteresis cycle and transient) tests were conducted on the pastes...

... will improve with the quality of recycled mortar or if the recycled material has a high aggregate-cement ratio. The recycled aggregate concrete showed somewhat better workability characteristics than conventional mixes although its modulus of elasticity and durability characteristics were lower. It is proposed...

...CD Johnston Measurements of the workability of freshly mixed steel fiber reinforced concrete have been conducted using the traditional slump test, the British Standard V-B test and the test for time of flow through an inverted slump cone recently issued as ASTM Test Method for Time of Flow of Fiber...

...DL Kantro A miniature slump test has been developed for the evaluation of the influence of water-reducing admixtures on the workability of neat portland cement pastes. Resulting paste pat areas rather than heights are measured, and the results are expressed as the percentage of water reduction...