Lightweight Self-Compacting Concrete Incorporating Industrial Rejects and Mineral Admixtures: Strength and Durability Assessment

By the recent global research developments, a lot of natural and artificial materials that are normally discarded and landfilled, are continually investigated for potential construction applications. In this study, the mechanical and durability properties of lightweight self-compacting concrete produced using pumice, ground granulated blast furnace slag (GGBS), rice husk ash (RHA) and precipitated silica, was investigated. A detailed experimental design was performed, which entailed reducing the water powder ratio, and use of viscosity modifying admixture, for enhancing the fresh SCC quality. The experimental process involved assessment of mechanical and durability properties of concrete mixtures. The results have shown that compressive and flexural strength of SCC made with lightweight aggregate are improved using mineral blended cement. Also, same mix, but with pumice as coarse aggregate gave higher split-tensile strength than other mixtures. This study deduced that pozzolanic reactivity and filler action of supplementary cementitious materials used, enhanced the resistance of the mixtures to deterioration when exposed to aggressive environment

Annex 18

This work was carried out with the aid of a grant from Canada’s International Development Research Centre (IDRC), and with financial support from the Government of Canada, provided through Global Affairs Canada (GAC)This annex reviews details of the biosafety features of hexanal. Hexanal has successfully been used on fruit crops and incorporated into several delivery technologies. The data have unequivocally demonstrated that hexanal and its formulations have produced no ill effects. Orchards in which hexanal spray was used had no adverse impacts on honey bees, soil microbes, earthworms or natural enemies. One of the major pests, the fruit fly, has been deterred by the formulation. Hexanal is chemically hexanaldehyde, a six-carbon compound, naturally produced by plants in trace quantities. When the plants are wounded or cut, there is a grassy odour which is chemically referred as “hexanal.

STRUCTURAL PROPERTIES OF LIGHTWEIGHT SELF-COMPACTING CONCRETE MADE WITH PUMICE STONE AND MINERAL ADMIXTURES

This study investigates the structural properties of lightweight self-compacting concrete produced using mineral admixtures and pumice stone as aggregate. Lightweight self-compacting concrete (LWSCC) mixes were prepared using pumice stone as replacement for natural coarse aggregate, and ground granulated blast furnace slag and rice husk ash were added as mineral admixtures. The flowability of the concrete mixtures was achieved by using gelinium B223 super plasticizer. Structural properties such as: density, compressive strength, flexural strength, and split-tensile strength of the concrete samples were determined for different mix proportions. Test results revealed that 30-40% replacement of coarse aggregate by pumice stone is considerable for improved density, compressive strength, split tensile strength and flexural strength development in LWSCC

Additional file 1: Figure S1. of Analysis of Population Structure and Genetic Diversity in Rice Germplasm Using SSR Markers: An Initiative Towards Association Mapping of Agronomic Traits in Oryza Sativa

Allelic pattern of different SSR markers used in this study. (JPG 1.03 MB

Additional file 3: Table S2. of Analysis of Population Structure and Genetic Diversity in Rice Germplasm Using SSR Markers: An Initiative Towards Association Mapping of Agronomic Traits in Oryza Sativa

Allele matrix of 192 accessions x 61 SSRs. (XLSX 10 kb