The performance of different natural fibers (hemp, kenaf and bamboo) used to formulate composites with an alkali-activated matrix based on metakaolin is evaluated. However, this behavior is quite different from the data calculated by the fib model. The coefficient of variation ( CoV) is only 0.01.
The bond-slip relations between the reinforcement and geopolymer concrete determined from FEA is in good agreement with experimental results. Then, the bond strength decreases with the increase of the c/ d b ratio from 4.19 to 5.75, while grade 20 MPa specimens is vice versa. For grade 30 MPa and 40 MPa specimens, the concrete cover to diameter ratio ( c/ d b) increased up to 4.19 resulted in the increase of bond strength. The test data indicated that the bond strength of reinforced fly ash-based geopolymer concrete increases about 1.97 to 2.56 times with the increase of compressive strength from 20.33 MPa to 41.12 MPa. The bond behavior of the reinforced geopolymer concrete is determined using pullout test, finite element analysis (FEA), and theoretical work. Three grades (20 MPa, 30 MPa and 40 MPa) of a geopolymer concrete along with three reinforcement diameters (12, 16, and 20 mm) were selected for experimental work. This paper presents the results of an experiment study and suggests a theoretical formulation for the bond behavior of reinforced fly ash-based geopolymer concrete. Authors may use MDPI'sĮnglish editing service prior to publication or during author revisions. Submitted papers should be well formatted and use good English. The Article Processing Charge (APC) for publication in this open access journal is 2300 CHF (Swiss Francs). Please visit the Instructions for Authors page before submitting a manuscript. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. All manuscripts are thoroughly refereed through a single-blind peer-review process.
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Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. All submissions that pass pre-check are peer-reviewed. Manuscripts can be submitted until the deadline. Once you are registered, click here to go to the submission form. Manuscripts should be submitted online at by registering and logging in to this website. This Special Issue aims to collect scientific contributions on strategies, manufacturing approaches, and materials devoted to providing systematic or predictive information on microstructure, mechanical properties, and durability of alternative binders to traditional Portland cement and to suggest methods for validation and standardization of testing. Investigations to reduce such gaps in knowledge thus represent a primary challenge. Nevertheless, different open questions related to shrinkage behavior, efflorescence, lack of specific additives to regulate properties, optimization and standardization of mix designs based on performance specifications, the wide range of raw materials and activators, and a lack of analysis and standards to test durability are preventing their extensive use. Several potential alternatives to traditional Portland cement are available, including calcium aluminate cement, calcium sulfoaluminate cement, alkali-activated binders, and supersulfated cements, that promise to reduce the environmental impact of construction. Further driving forces are the development of mortars and concrete with increased durability in aggressive environments and the use of a greater proportion of waste materials. This is a direct consequence of the increasing pressure to reduce the energy consumption and the associated greenhouse gas emissions related to the production of Portland cement. Alternative binders to traditional Portland cement are receiving ever-greater attention in the civil, materials, and environmental research fields.
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