Assessment on the Properties of Biomass-Aggregate Geopolymer Concrete

Abstract

Energy efficiency is one of the important indicators for the evaluation of green buildings, and it is also related to the sustainable development of the building industry and energy conservation. Using agricultural waste in concrete to produce biomass recycled aggregates can effectively utilize agricultural solid waste to develop new wall materials with economic and energy-efficient properties. In this study, industrial wastes such as ground, granulated blast-furnace slag (GGBS) and fly ash (FA) were used to replace cement as cementitious material and coconut shell (CC) as lightweight coarse aggregate (LWA) in lightweight concrete. The lightweight coconut shell aggregate concrete with a density of less than 1950 kg/m3 was used as structural concrete. The thermal conductivity of synthesized biomass recycled aggregate concrete (SBRAC) was about 0.47 W/mK, which is 217% and 19% lower than that of natural aggregate concrete (NAC) and crushed coconut shell aggregate concrete (CCSAC), respectively. With the same volume, the costs of SBRAC and CCSAC are 25.1% and 4.9% lower than that of NAC, respectively.

Performance and applications of lightweight geopolymer and alkali activated composites with incorporation of ceramic, polymeric and lignocellulosic wastes as aggregates: A review

“…It is crushed into particles up to 20 mm ( Fig. 3 f) [ 90 , 91 ]. As a pre-treatment, it can be immersed in water and partially dried by solar radiation, so that the moisture retained in the shell prevents the absorption of water from the cementitious binder, thereby improving concrete workability [ 89 , 90 ].…”

“…In composites where 100% of stone aggregate was replaced by coconut shell (4.7–7 mm) the density was 1820 kg/m3. The density of the composite increased to 1945 kg/m3 when using 100% coconut particles previously coated with the matrix cementitious agent [ 91 ]. This pre-treatment was performed to improve the compatibility between the matrix and the coconut husk LWA.…”

Effect of Walnut-Shell Additive on the Structure and Characteristics of Concrete

“…To create the most massive need for walnut shells, which could allow large-scale and environmentally safe disposal of its entire volume, is possible only by integrating the recycling process into large and fundamental industrial sectors. The most important candidate for this is the construction industry and the production of building structures [ 19 ]. The walnut shell, in comparison with other agricultural waste, has more valuable technical indicators.…”

“…However, lightweight self-compacting concrete with characteristics that meet the requirements of modern construction can be obtained with a walnut-shell content of 35% or more. Comparing the mechanical properties of the composition with organic coarse aggregate, a decrease in strength indicators will inevitably be observed compared to concretes of normal density; however, such a composition acquires properties characteristic of lightweight concretes—lighter weight, and improved soundproof and heat-shielding properties [ 19 , 30 ]. The SC of the walnut shell are much higher than those of the aggregates of light concretes, which makes it possible to use it as a partial replacement for coarse aggregates in concretes of normal density, giving them properties uncharacteristic of such concretes, with minimal losses in strength indicators [ 31 , 32 , 33 , 34 , 35 ].…”

Thermal and Stress Properties of Briquettes from Virginia Mallow Energetic Crops

“…The thermal and stress parameters of the compacted biomass should be of interest in both modeling and experimental analysis of biomass densified into briquettes and further into charcoal during the torrefaction process. However, the first studies regarding physical stress characterization of densified biomass were undertaken by Liu et al [ 1 ]. Their research pointed to several important thermal and stress parameters of compacted biomass for its processing and applications in building construction.…”