Effective use of sawdust for the production of eco-friendly and thermal-energy efficient normal weight and lightweight concretes with tailored fracture properties. (20th May 2018)

• Record Type: Journal Article
• Authors: Ahmed, Wisal; Khushnood, Rao Arsalan; Memon, Shazim Ali; Ahmad, Sajjad; Baloch, Waqas Latif; Usman, Muhammad
• Is Part Of: Journal of cleaner production. Volume 184(2018)
• Page Start: 1016
• Page End: 1027
• Publication Date: 2018-05-20
• Subjects: Sawdust -- Lightweight concrete -- Sustainability -- Energy efficiency -- Volumetric stability -- Thermal insulation -- Flexural strength -- Fracture toughness -- CO2 emissions; AFM Atomic force microscopy -- BTU British thermal unit -- DTA Differential thermal analysis -- FESEM Field emission scanning electron microscopy -- FTIR Fourier transform infrared radiation -- LWC Lightweight concrete -- NSC Normal strength concrete -- NWC Normal weight concrete -- SD Sawdust -- TGA Thermal gravimetric analysis -- TR Refrigeration ton -- XRD X-ray diffraction -- XRF X-ray fluorescence -- 10SD-NWC Normal weight concrete containing 10 percent sawdust content -- 10SD-LWC Lightweight concrete containing 10 percent sawdust content; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.03.009
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: In this research, we produced eco-friendly and thermal efficient normal and lightweight concretes with different dosages of sawdust as replacement of sand. Conventional NWC containing 0, 5, 10, and 15% sawdust and LWC containing 0 and 10% sawdust of total dry volume of sand were evaluated in terms of volumetric shrinkage, compressive strength, flexural strength, fracture toughness, water absorption, density, thermal conductivity and energy efficiency. Test results showed that volumetric shrinkage and concrete density decreased while water absorption increased with the increase in sawdust percentage. For NWC and LWC sawdust formulations, the total fracture toughness increased by 10.71% and 14.89% respectively while the rupture strain increased by 58.86% and 37.30% respectively. At 28 days, the compressive strength of NWC and LWC sawdust formulations was more than 34 MPa and 21 MPa respectively and hence these concretes can be used for structural applications. The energy analysis of single room model prepared with sawdust formulations showed significant reduction (up to 21.42%) in heating ventilation and air-conditioning (HVAC) as well as in CO2 emissions (up to 13%). Conclusively, the utilization of sawdust provides viable source of raw materials for construction industry, eco-friendly solution of sawdust disposal and would help in conserving natural aggregate reservoirs. Highlights: Eco-friendly disposal of Wood-waste was addressed by using it as fine aggregates. Addressed the issue of depleting natural sand reservoirs. Sawdust mixes improved shrinkage (up to 42%), rupture strain (up to 58.86%) etc. Sawdust mixes can be used for structural applications. Sawdust mixes reduced HVAC energy (up to 21.42%)and CO2 emissions (up to 13%).