Portal de Periódicos da CAPES

Durability of alumina silicate concrete based on slag/fly-ash blends against acid and chloride environments

2016; Institute of Metals and Technology; Volume: 50; Issue: 6 Linguagem: Esloveno

10.17222/mit.2015.230

1580-3414

Rajagopalan Gopalakrishnan, K. Chinnaraju,

Zeolite Catalysis and Synthesis

The durability of a concrete mainly depends on its resistance against acid and chloride environments.This article presents an investigation of the durability of geopolymer concrete with GBFS (Granulated Blast Furnace slag), Fly ash (class F) and alkaline activators when exposed to 5 % sulphuric acid and chloride solutions.GBFS was replaced by fly ash with different replacement levels from 0 % to 50 % in a constant concentration of 12-M alkaline activator solution.The main parameters of this study are the evaluation of the change in weight, strength and microstructural changes.The degradation was studied using Scanning Electron Microscopy (SEM) with EDAX.From the test results it is observed that the strength of the geopolymer concrete with GBFS in ambient curing performs compared well to geopolymer concrete with GBFS blended with fly ash.The acid resistance in terms of the rate of reduction of strength of GPC with GBFS is 85 %, while for 40 % replacement of fly ash to GBFS performs well with a reduction of only 53 %.Similar observations are also observed in a chloride environment in which 40 % replacement of fly ash to GBFS performs well when compared to GPC with GBFS.Hence, geopolymer concrete with 40 % replacement of fly ash for GBFS is the appropriate level of replacement, satisfying the above durability properties.Keywords: durability, geopolymer concrete, acid and chloride environment Zdr`ljivost betona je predvsem odvisna od odpornosti na kislo in kloridno okolje.^lanek predstavlja preiskavo zdr`ljivosti geopolimernega betona z GBFS (granulirana `lindra iz plav`a), lete~ega pepela (razred F) in alkalnih aktivatorjev med izpostavitvijo 5 % `vepleni kislini in kloridnim raztopinam.V GBFS je bila dodana razli~na koli~ina: od 0 % do 50 % lete~ega pepela pri konstantni koncentraciji 12 M raztopine alkalnega aktivatorja.Glavni parametri v {tudiji so bili sprememba te`e, trdnost in mikrostrukturne spremembe.Degradacija je bila preu~evana z uporabo vrsti~nega elektronskega mikroskopa (SEM) z EDAX.Iz rezultatov preizkusov je opaziti, da je pri izpostavitvi trdnost geopolimernega betona z GBFS dobra, v primerjavi z geopolimernim betonom z GBFS s prime{anim lete~im pepelom.Odpornost na kislino, izra`eno s hitrostjo zmanj{evanja trdnosti GPC z GBFS je 85 %, medtem ko se pri 40 % nadomestitvi lete~ega pepela v GBFS, ta pona{a dobro, s samo 53 % zmanj{anjem trdnosti.Podobna opa`anja so bila tudi v kloridnem okolju, v katerem se 40 % nadomestilo lete~ega pepela v GBFS obna{a dobro, v primerjavi z GPC, ki vsebuje tudi GBFS.Torej je geopolimerni beton, s 40 % nadomestitvijo lete~ega pepela z GBFS, primeren za zgoraj omenjeno zdr`ljivost.