Browsing by Author "Fernando, WSSR"

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item: Conference-Full-text
Effects of Recycled Fine Aggregate Content on Cementitious Mortar
(2015-08-14) Subasinghe, IS; Madusanka, VPS; Jayasinghe, VRDK; Sundarapperuma, SMAP; Fernando, WSSR; Chandrasiriand, SAKN; Karunarathne, S
Properties of the recycled fine aggregates and the suitability of the same in cementitious mortar were studied and compared with those of natural fine aggregates. The results showed that the particle size distribution of recycled fine aggregates is compatible with those of natural fine aggregates. The recycled fine aggregates had fine fraction and bulk density of 13.47% and 1407kg/m3, respectively while those of the natural fine aggregates were 1.51% and 1453kg/m3, respectively. Specific Gravity of recycled fine aggregates was 2.499with compared to 2.408 of Natural fine aggregates and the water absorption was 6.325% with compared to 0.71% of Natural fine aggregates. Chloride Content of recycled fine aggregate was 0.0150% with compared to 0.0005% of natural fine aggregate. Properties of mortar made fewer than five testing scenarios consisting different proportions of natural fine aggregate to recycle fine aggregate as 100%-0%,75%-25%,50% -50%, 25%-75%, and 0%-100% were compared with those of 100% natural fine aggregates. With increasing percentage of recycled aggregate content, compressive strength increased in 0.7 Water cement ratio while the workability decreased. According to the results, mortar properties could be achieved with mix proportions of 50% natural fine aggregate and 50% recycled fine aggregate, without significantly affecting the mortar properties, indicating a 50% saving of natural fine aggregates thus reducing environmental impacts and enhancing sustainability.
item: Conference-Full-text
Effects of recycled fine aggregate content on cementitious mortar
(Department of Earth Resources Engineering, 2014-07) Subasinghe, IS; Madusanka, VPS; Jayasinghe, VRDK; Sundarapperuma, SMAP; Fernando, WSSR; Chandrasiri, SAKN; Karunarathne, S; Hemalal, PVA
Properties of the recycled fine aggregates and the suitability of the same in cementitious mortar were studied and compared with those of natural fine aggregates. The results showed that the particle size distribution of recycled fine aggregates is compatible with those of natural fine aggregates. The recycled fine aggregates had fine fraction and bulk density of 13.47% and 1407kg/m3, respectively while those of the natural fine aggregates were 1.51% and 1453kg/m3, respectively. Specific Gravity of recycled fine aggregates was 2.499with compared to 2.408 of Natural fine aggregates and the water absorption was 6.325% with compared to 0.71% of Natural fine aggregates. Chloride Content of recycled fine aggregate was 0.0150% with compared to 0.0005% of natural fine aggregate. Properties of mortar made fewer than five testing scenarios consisting different proportions of natural fine aggregate to recycle fine aggregate as 100%-0%,75%-25%,50% -50%, 25%-75%, and 0%-100% were compared with those of 100% natural fine aggregates. With increasing percentage of recycled aggregate content, compressive strength increased in 0.7 Water cement ratio while the workability decreased. According to the results, mortar properties could be achieved with mix proportions of 50% natural fine aggregate and 50% recycled fine aggregate, without significantly affecting the mortar properties, indicating a 50% saving of natural fine aggregates thus reducing environmental impacts and enhancing sustainability.
item: Conference-Full-text
Effects of varying recycled fine aggregate content and water/cement ratio in bedding mortar
(Ceylon Institute of Builders, 2014-06) Karunarathne, S; Subasinghe, IS; Madusanka, VPS; Jayasinghe, VRDK; Sundarapperuma, SMAP; Fernando, WSSR; Chandrasiri, SAKN; Sandanayake, YG; Karunasena, GI; Fernando, NG
This paper presents the results from a research carried out with the aim of analysing the usability of Recycled Fine Aggregates (RFA) produced from Construction and Demolition Waste (CDW), in bedding mortar. Properties of RFA were compared to that of the Natural Fine Aggregates (NFA) in terms of Bulk Density, Fine Fraction, Particle Size Distribution, Water Absorption and Chloride Content and were tested for five mixed proportion scenarios of RFA and NFA at 0%, 25%, 50%, 75% and 100% RFA contents. RFA indicated a water absorption of 6.33% when compared to that of 0.71% for NFA (ordinary river sand). Mortar testing was further divided under three water/cement ratios at 0.5, 0.6 and 0.7. Bulk density gradually decreased with increased RFA content yet recorded an exceptional highest of 1476Kg/m3 at 75%RFA. Results from fine fraction and particle size distribution indicated compatibility of RFA to replace NFA up to 50% RFA. Chloride content analysis indicated allowable RFA replacement levels up to 99% and 44% for bedding mortar and plastering mortar applications, respectively. Though higher water absorption demanded for higher water content, Compressive Strength increased with the increasing RFA content, even above NFA values, reaching a maximum of 15.2 ± 0.50 N/mm2 at 75% RFA for 0.7 water/cement ratio while workability was within the acceptable range at 50% RFA at the same water content. The analysis in terms of fine aggregate properties and mortar properties showed that up to 50%, NFA can be substituted with RFA at water/cement ratio of 0.7 in bedding mortar which will also attribute to a cost reduction of minimum 50%, as well as to greatly reduce the disastrous environmental impacts from sand mining and waste disposal thus enhancing sustainability.