The effect of steam curing on chloride penetration in geopolymer concrete

Ekaputri, Januarti Jaya; Mutiara, Inne Syabrina; Nurminarsih, Siti; Chanh, Nguyen van; Maekawa, Koichi; Setiamarga, Davin H. E.

doi:10.1051/matecconf/201713801019

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…In recent years, several alternatives have been studied to replace the classic cement as a building material. Geopolymers, in the family of inorganic aluminosilicate binder, has received extensive interests because of high temperature resistance [70,[102][103][104][105], low permeability [106][107][108][109][110], strong bonding and good durability [51,[111][112][113], excellent chemical corrosion resistance [114][115][116][117][118], and environmental friendliness [119,120], etc. Some of the uses that have been investigated for alkaline activated materials are: as sustainable construction material [121][122][123][124][125][126], mine backfilling [127,128], porous spheres as novel pH buffers [129,130], bricks [71,112,131,132], porous thermal insulation material [133], as road material [134], for immobilization of toxic metals and nuclear waste management [135][136][137][138][139][...…”

Section: Curing Temperature and Timementioning

confidence: 99%

Factors Affecting the Compressive Strength of Geopolymers: A Review

et al. 2021

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Geopolymers are created by mixing a source of aluminosilicates, which can be natural or by-products from other industries, with an alkaline solution. These materials based on by-products from other industries have proven to be a less polluting alternative for concrete production than ordinary Portland cement (OPC). Geopolymers offer many advantages over OPC, such as excellent mechanical strength, increased durability, thermal resistance, and excellent stability in acidic and alkaline environments. Within these properties, mechanical strength, more specifically compressive strength, is the most important property for analyzing geopolymers as a construction material. For this reason, this study compiled information on the different variables that affect the compressive strength of geopolymers, such as Si/Al ratio, curing temperature and time, type and concentration of alkaline activator, water content, and the effect of impurities. From the information collected, it can be mentioned that geopolymers with Si/Al ratios between 1.5 and 2.0 obtained the highest compressive strengths for the different cases. On the other hand, high moderate temperatures (between 80 and 90 °C) induced higher compressive strengths in geopolymers, because the temperature favors the geopolymerization process. Moreover, longer curing times helped to obtain higher compressive strengths for all the cases analyzed. Furthermore, it was found that the most common practice is the use of sodium hydroxide combined with sodium silicate to obtain geopolymers with good mechanical strength, where the optimum SS/NaOH ratio depends on the source of aluminosilicates to be used. Generally speaking, it was observed that higher water contents lead to a decrease in compressive strength. The presence of calcium was found to be favorable in controlled proportions as it increases the compressive strength of geopolymers, on the other hand, impurities such as heavy metals have a negative effect on the compressive strength of geopolymers.

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Section: Curing Temperature and Timementioning

confidence: 99%

Factors Affecting the Compressive Strength of Geopolymers: A Review

et al. 2021

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“…Based on Figure 1 the highest modulus value of rupture of geopolymer concrete at a combination of steam curing temperature 80 o C, at a steam room of 3.87 MPa and steam-water of 3.24 MPa. Steam curing with a temperature of 80 o C for 24 hours obtains the highest pressure strength value [13], curing method by keeping concrete in an indoor room at a temperature of 40 o C, 60 o C, and 80 o C.…”

Section: Normal Concretementioning

confidence: 99%

Study of Modulus of Rupture on Geopolymer Concrete Temperature Difference Methods of Steam Curing

Ujianto,

Majid,

Aulia

et al. 2024

E3S Web of Conf.

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Geopolymer concrete is concrete without cement. Cement replacement due to cement production has resulted in a global warming effect. Fly ash as a substitute for cement is a waste of coal production containing pozzolan properties. Concrete must have reliable mechanical properties of the modulus of rupture. This research aims to study the influence of the modulus of rupture on the steam curing of geopolymer concrete-based fly ash as a substitute for cement and alkaline activator of 12 Mol NaOH: Na2SiO3 (3:1). The applied steam curing temperatures are 60oC, 70oC, and 80oC. After steam curing, the sample is stored at ambient curing and submerged in water. The sample beam is 15 x 15 cm x 60 cm to find the value of the modulus of rupture. The test results obtained a modulus of rupture concrete geopolymer steam curing temperature of 80 and ambient curing of 3.87 MPa. Steam curing of 70oC and ambient curing of 3,71 MPa. Steam curing of 60oC and the ambient curing is 2.71MPa. It can be concluded that the higher the steam curing temperature the value of the modulus of rupture is higher.

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“…Curing conditions, normally, depend on the type of aluminosilicate component. In the literature, the most common conditions are moisture-humidity treatment [30], drying in an oven [31], ambient conditions [32,33].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixing Procedure and Chemical Composition on Physical and Mechanical Performance of Geopolymers

Kozhukhova

Teslya

Alfimova

et al. 2021

MSF

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Nowadays geopolymer is promising and relevant material that can be effectively used in wide range of application areas. It is possible because of there are a lot of potential sources of raw materials for geopolymer synthesis. Raw components are the one of the key parameters that effect on geopolymer performance. On the other hands, the technological stages of geopolymer synthesis is no less important factor. The purpose of this study was to determine effect of technological parameters of geopolymer synthesis such as component composition of solid state phase, alkaline activator preparation and its introduction onto geopolymer paste as well as curing temperature on performance characteristics of geopolymer. Fly-ash based geopolymer samples were prepared with adding of different mineral components: Portland cement (PC), kaolin, metakaolin; different curing temperature conditions: ambient temperature and temperature treatment at 70 °C in oven during 24 hours; different methods of preparation and application of alkaline activator: using of fresh alkaline solution and using alkaline solution after 24 hours of cooling. The results show that efficiency of curing temperature conditions strongly depend on component composition of geopolymer paste. Samples, containing PC and metakaolin demonstrate better characteristics after curing under ambient temperature. Samples, containing kaolin and reference composition (fly ash only) the temperature treatment in oven is the best curing method (increasing in compressive strength up to 13 times). Using alkaline solution of NaOH after 24 hours of cooling gives a good effect on geopolymerization process and provides increasing in compressive strength value from 13 to 84 % for all experimental geopolymer pastes. However, average density for all compositions is varied slightly.

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The effect of steam curing on chloride penetration in geopolymer concrete

Cited by 8 publications

References 15 publications

Factors Affecting the Compressive Strength of Geopolymers: A Review

Factors Affecting the Compressive Strength of Geopolymers: A Review

Study of Modulus of Rupture on Geopolymer Concrete Temperature Difference Methods of Steam Curing

Effect of Mixing Procedure and Chemical Composition on Physical and Mechanical Performance of Geopolymers

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