{"title":"Heat Hydration of Recycled Concrete: Experimental Study","authors":"S. Suharwanto","doi":"10.2991/assehr.k.200402.004","DOIUrl":"https://doi.org/10.2991/assehr.k.200402.004","url":null,"abstract":"—The experimental study has been done to get data of heat hydration. It important to know the temperature in the concrete during hydration reaction and forming a gel condition of silica reaction with water. Eighteen concrete specimens of cubes have been tested for many dimensions, those are cube 25cm, 50cm, 75cm for length all of side. They made from a fine and coarse aggregate of natural and recycled aggregate from burning building waste and ready-mix residual as a base concrete material. Base on the experimental study, the peak of heat hydration occurs at 10 to 21 hours. Then it will decrease that caused by hydration reaction will be complete and form to gel condition. The heat hydration in the concrete is not affected by site or room temperature, because it is caused by the hydration reaction process between silica and water until gel condition. The peak of heat hydration will increase along with higher concrete strength because it requires more cement that is reactor with water. It can affect to surface cracking for the mass concrete because it causes increasing adiabatic to fresh concrete in the early age. And it also affects a volumetric expansion in the core, so the surface of concrete gets excessive tensile stress beyond of capacity.","PeriodicalId":305822,"journal":{"name":"Proceedings of the International Conference on Agriculture, Social Sciences, Education, Technology and Health (ICASSETH 2019)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134490647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Response of Soybean Growth (Glycine max (L.) Merril) on the Treatment of Refugia Plant and Nanosilica Fertilizer","authors":"T. Suciaty, Wijaya Wijaya, D. Dukat","doi":"10.2991/assehr.k.200402.028","DOIUrl":"https://doi.org/10.2991/assehr.k.200402.028","url":null,"abstract":"—This study aims to analyse the growth response of soybean ( Glycine max (L.) Merrill) to the treatment of refugia plants and Nano silica fertilizer. The research was conducted at the Unit of Palawija Seed Development and Paddy, Agriculture Office of West Java Province, Plumbon, Cirebon Regency, from December 2018 to May 2019. The materials that were used include soybean varieties Grobogan, sunflowers, Zinnia elegant and marigolds, Nano silica fertilizers and NPK. This study uses a split plot design with the main plot was kind of refugia plants and sub-plots was Nano silica fertilizer concentration. The observed variables included plant height, stem diameter, number of leaves and number of branches, observations were made at the age of 14, 21, 28 and 35 days after planting (dap). The results showed that refugia plants had no effect on soybean growth, while the application of Nano silica fertilizer concentration of 1.75 ml/l and 3.50 ml/l gave the best effect on all components of soybean growth observed.","PeriodicalId":305822,"journal":{"name":"Proceedings of the International Conference on Agriculture, Social Sciences, Education, Technology and Health (ICASSETH 2019)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122399200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}