2017
DOI: 10.1590/1980-5373-mr-2016-0974
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Fracture Properties of Geopolymer Concrete Based on Metakaolin, Fly Ash and Rice Rusk Ash

Abstract: Geopolymers are exclusively mineral nature and are considered an alternative to materials based on Portland clinker, whose production accounts for about 5% of anthropogenic CO 2 emissions in the world. The geopolymer cement concrete (GCC) may be prepared from natural oxide-aluminosilicates such as metakaolin (MK), or synthetic, such as fly ash (FA) together with active silica contained in the rice husk ash (RHA). The fracture properties of the Portland cement concrete (PCC) with 25 MPa and 50 MPa, and of three… Show more

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Cited by 16 publications
(4 citation statements)
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“…Despite all these recent developments, geopolymers still suffer from sudden unstable fractures due to their extreme brittleness [31,32]. The excessive low resistance to crack initiation/propagation is not due only to the fragility of the geopolymer product of reaction, but also to the extent of porosity and crack production during hardening.…”
Section: Introductionmentioning
confidence: 99%
“…Despite all these recent developments, geopolymers still suffer from sudden unstable fractures due to their extreme brittleness [31,32]. The excessive low resistance to crack initiation/propagation is not due only to the fragility of the geopolymer product of reaction, but also to the extent of porosity and crack production during hardening.…”
Section: Introductionmentioning
confidence: 99%
“…In order to reduce greenhouse emissions in civil engineering activities, many novel construction materials were developed in recent decades [61]. Unlike the fabrication process of OPC using compounds that release carbon dioxide, GPC uses waste by-product materials which are environment friendly [62], and can be defined as green materials.…”
Section: Resultsmentioning
confidence: 99%
“…In 1991, Davidovits [ 2 ] prepared a new aluminosilicate inorganic polymer, referred to as a geopolymer, by combining a solid aluminosilicate with an alkali metal silicate solution in an alkaline environment. Over the past three decades, materials such as fly ash, slag, metakaolin, waste glass and biomass ash have been used with an alkali activator to synthesize geopolymers in order to replace cement [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. The mechanical properties of geopolymers prepared with pure fly ash were generally poor; however, when the fly ash was partially substituted with slag, the mechanical properties, micro-structure and erosion resistance of the geopolymers were significantly enhanced [ 12 , 13 , 14 , 15 , 16 ].…”
Section: Introductionmentioning
confidence: 99%