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Abstract
Alginate from Large brown seaweeds act as natural polymer has been investigated as polymer and has been added to concrete in different percentages ( 0% , 0.5% , 1% and 1.5% ) by the cement weight and the study show the effect of using alginate biopolymer admixtures on some of the fresh properties of the concrete (slump & the density fresh) also in the hardened state ( Compressive strength , Splitting tensile strength and Flexural strength ) at 28 days. The mix proportion was (1:2.26:2.26) (cement: sand: gravel) respectively and at constant w/c equal to 0.47. The results indicate that the use of alginate as a percent of the cement weight possess a positive effect on fresh properties of concrete at 28 days. In other words, increasing the percentages of alginate addition has enhanced the slump and fresh density of concrete at 28 days, so the 1.5% alginate addition as percent of the cement weight showed the higher percentage of increasing where it was 2.5% for fresh density and 41%for slump of concrete at 28days compared with the reference mix without any addition, also the hardened properties (compression ,splitting tensile and flexural strength) at 28 days showed an increasing when using alginate at a percentage from the cement weight, so the highest increase was at 0.5% and 1.5% of alginate addition where it was about 40%.
Highlights
Biopolymer has been defined as polymer that developed from living being
Alginate from Large brown seaweeds act as natural polymer has been investigated as polymer and has been added to concrete in different percentages ( 0%, 0.5%, 1% and 1.5% ) by the cement weight and the study show the effect of using alginate biopolymer admixtures on some of the fresh properties of the concrete in the hardened state ( Compressive strength, Splitting tensile strength and Flexural strength ) at 28 days
The results indicate that the use of alginate as a percent of the cement weight possess a positive effect on fresh properties of concrete at 28 days
Summary
Polymers became an essential part in our daily life They have tremendous advantages have been used in every field. These polymer products form about 150 million ton of non-bio degradable waste every year such waste leads to varies problems of pollution, soil erosion and others environmental problems. The construction industry has become a major field of use for biopolymers. It is supplied as a powder that is packed as either in bulk, tins or in pre weighed individual containers, dough kind of alginate is as well as existing. The dough-kind material has a smaller gelation time than the powder-type material (Murata, et al, 2004). The best surface quality can be obtained with the dough-kind material It has been recommended to distribute the powder by fluffing it by spreading out and tumbling the can, dipping the scoop, tapping the scoop gently with the spatula, and levelling the powder in the scoop with a spatula (Madhavan And Abirami, 2015)
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