Temperature Effect on Lime Powder-Added Geopolymer Concrete

Hake, S. L.; Damgir, R. M.; Patankar, Subhash V.

doi:10.1155/2018/6519754

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…In the presence of 5% hemp, the presence of even a slight amount of lime reduced the flexural strength (by less than 2%), but this may be within the measurement error. This is not comparable to the results of studies presented by other authors, where the addition of lime of up to 10% or even 15% showed improved compressive as well as flexural strength [ 36 , 43 ]. According to these researchers, the addition of more than 15% lime shows a decreasing trend of workability, while in this study, the addition of a mere 5% of lime deteriorated the workability of the mortar.…”

Section: Resultscontrasting

confidence: 99%

“…In fact, a higher content helps for quicker geopolymerisation and the development of semi-crystalline Ca-Al-Si gel [ 35 ]. The beneficial effect of the presence of lime in an amount of up to 10% by weight of fly ash on the compressive strength of geopolymer mortars was also observed by other researchers [ 36 ]. The lowest strength was noticed in Series 7 with 5% hemp content.…”

Section: Resultssupporting

confidence: 72%

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Alkali-Activated Mortars with Recycled Fines and Hemp as a Sand

Pawluczuk

Kalinowska-Wichrowska

Soomro

2021

Materials

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Nowadays, effective and eco-friendly ways of using waste materials that could replace natural resources (for example, sand) in the production of concrete composites are highly sought. The article presents the results of research on geopolymer composites produced from two types of waste materials—hemp and fine fractions recovered from recycled cement concrete, which were both used as a replacement for standard sand. A total of two research experiments were conducted. In the first experiment, geopolymer mortars were made using the standard sand, which was substituted with recycled fines, from 0% to 30% by weight. In the second study, geopolymers containing organic filler were designed, where the variables were (i) the amount of hemp and the percent of sand by volume (0%, 2.5%, and 5%) and(ii) the amount of hydrated lime and the percent of fly ash (by weight) (0%, 2%, and 4%) that were prepared. In both cases, the basic properties of the prepared composites were determined, including their flexural strength, compressive strength, volume density in a dry and saturated state, and water absorption by weight. Observations of the microstructure of the geopolymers using an electron and optical microscope were also conducted. The test results show that both materials (hemp and recycled fines) and the appropriate selection of the proportions of mortar components and can produce composites with better physical and mechanical properties compared to mortars made of only natural sand. The detailed results show that recycled fines (RF) can be a valuable substitute for natural sand. The presence of 30% recycled fines (by weight) as a replacement for natural sand in the alkali-activated mortar increased its compressive strength by 26% and its flexural strength by 9% compared to control composites (compared to composites made entirely of sand without its alternatives). The good dispersion of both materials in the geopolymer matrix probably contributed to filling of the pores and reducing the water absorption of the composites. The use of hemp as a sand substitute generally caused a decrease in the strength properties of geopolymer mortar, but satisfactory results were achieved with the substitution of 2.5% hemp (by volume) as a replacement for standard sand (40 MPa for compressive strength, and 6.3MPa for flexural strength). Both of these waste materials could be used as a substitute for natural sand and are examples of an eco-friendly and sustainable substitution to save natural, non-renewable resources.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 72%

Alkali-Activated Mortars with Recycled Fines and Hemp as a Sand

Pawluczuk

Kalinowska-Wichrowska

Soomro

2021

Materials

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“…Hake et al [2] articulate that the compressive strength of geopolymer concrete of grade M30 goes on increasing with th addition of 5% and 10% of lime. Addition of 15%, 20%, and 25% of lime in geopolymer concrete of grade M30 makes the concrete harsh which adversely affects its workability as well as its compressive strength.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigate Mixing Ingredient for Lime Added Geopolymer Concrete

Hake

Damgir

2019

Global J. Civ. Eng.

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As the tremendous use of cement for construction, the OPC production increases day by day. The cement production is held responsible for CO2 emissions, which polluted the atmosphere. Hence, it is inevitable to find an alternative material to OPC. Geopolymer concrete is a best alternative which shall be produced by the chemical action of inorganic molecules. This paper focuses on fly-ash based Geopolymer concrete with addition of lime. In the geopolymer concrete, cement is completely replaced by fly ash (P60). Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) of 13 moles was initially used as an alkaline solution with Na2SiO3: NaOH ratio 2.5. Three type of lime samples is used i.e. Quick, Hydrated and Slaked with variation in lime percentiles as 5%, 10%, 15% and 20%. The sodium hydroxide of 10, 13, 16 and 19 molarity are used along with optimum lime percentage for comparative and tensile behavior study. After specified period samples are remolded and cured at natural sun shade for 24 hours. After natural curing hours, optimum rest period is taken as 7 days. Sample having size 150 X 150 X 150 mm was tested for compressive strength and split tensile strength. Slump cone test and flow table test on fresh mix sample is also performed. The temperature curing for the polymerization is not required in case of the lime added fly ash based geopolymer concrete.

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“…Reactive powder concrete (RPC) is an ultrahighperformancecement-based composite concrete in which the traditional coarse aggregate has been replaced by fne sand [1][2][3][4][5][6][7][8][9]. Te term "reactive powder" means that all the powder components in the RPC are chemically reactive [10].…”

Section: Introductionmentioning

confidence: 99%

Determination of Optimized Mix Design of Reactive Powder Concrete

Moslehi

Rahmatabadi

Arman

2023

Advances in Civil Engineering

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There are different types of reactive powder concrete (RPC) and researchers continue to develop better-quality mix designs. This research presents an integrated approach for RPC mix design. For this purpose, 13 RPC mix designs were collected according to expert opinion and laboratory samples and were tested in this study for validation of the characteristics of compressive strength and water absorption. The samples were then ranked using the simple additive weighting (SAW) method, and three highest-quality RPCs were selected for the Taguchi method. These RPCs were used to prepare 27 experimental RPC mix designs applying the Taguchi method. From the experimental results, compressive strength with 0.38–0.76% and water absorption with 0.50–0.99% differences were more appropriate in compliance with the collected data. Also, results from the 27 mix designs investigated by the Taguchi method revealed the optimized mix design for the maximum compressive strength with 146.7 MPa and the optimized mix design for the minimum water absorption with 0.89%. The results showed that our approach was consistent with the results of classic methods that require a large number of samples. This suggests that integrating the SAW and Taguchi methods is an appropriate approach for screening and optimizing RPC mix design.

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Temperature Effect on Lime Powder-Added Geopolymer Concrete

Cited by 13 publications

References 5 publications

Alkali-Activated Mortars with Recycled Fines and Hemp as a Sand

Alkali-Activated Mortars with Recycled Fines and Hemp as a Sand

Investigate Mixing Ingredient for Lime Added Geopolymer Concrete

Determination of Optimized Mix Design of Reactive Powder Concrete

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