ROPER, H & BAWEJA, D 1987, 'CARBONATION OF CONCRETE AND ITS PREDICTION - DISCUSSION', CEMENT AND CONCRETE RESEARCH, vol. 17, no. 6, pp. 1003-1004.
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Sri Ravindrarajah, R 1987, 'Utilization of waste concrete for new construction', Conservation & Recycling, vol. 10, no. 2-3, pp. 69-74.
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Sri Ravindrarajah, R & Tam, CT 1987, 'Recycling concrete as fine aggregate in concrete', International Journal of Cement Composites and Lightweight Concrete, vol. 9, no. 4, pp. 235-241.
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Increasing shortage of natural aggregates for concrete in urban areas leads to a search for aggregates from new sources. This paper examines the use of crushed concrete fines (CCF) produced from 'waste' concrete as fine aggregate in concrete. Tests were carried out to study the properties of crushed concrete fines and the properties of concrete incorporating them. The results show that the modulus of elasticity, pulse velocity, and the long-term properties such as drying shrinkage and creep are significantly affected. It has been found that the detrimental effects of using crushed concrete fines in concrete can be mitigated by a partial replacement of crushed concrete fines with pulverised fuel ash (pfa). © 1987.
Sri Ravindrarajah, R, Loo, YH & Tam, CT 1987, 'Recycled concrete as fine and coarse aggregates in concrete', Magazine of Concrete Research, vol. 39, no. 141, pp. 214-220.
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Synopsis The effects of using crushed concrete as coarse and fine aggregates upon strength and deformation of concrete are reported. The properties of recycled aggregates differ from those of natural aggregates due to the presence of a considerable proportion of mortar attached natural aggregate and loose mortar. For a medium strength concrete, the results show that strength and modulus of elasticity are reduced by about 10% and 35%, respectively, whereas drying shrinkage is nearly doubled when recycled aggregates are used instead of natural aggregates in comparable mixes. The efect of recycledfine aggregate on the deformational properties is less than that of coarse aggregate. Fresh concrete properties are only marginally affected by the use of recycled aggregates.
Tam, CT, Lim, TY, Sri Ravindrarajah, R & Lee, SL 1987, 'Relationship between strength and volumetric composition of moist-cured cellular concrete', Magazine of Concrete Research, vol. 39, no. 138, pp. 12-18.
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Synopsis The effect of the volumetric composition of cellular concrete, particularly water and air voids, on its compressive strength has been demonstrated to follow Feret's general formula. The increase in strength at all ages with a corresponding increase in water/cement ratio (opposite to that of mortar mixes) as obtained in the experiment has been shown to be consistent with Feret's formula. The inclusion of the degree of hydration in the modified form of Power's gel/space ratio further improves the correlation with strength when this is taken as the parameter.
