Developing high-performance concrete incorporating highly-reactive rice husk ash

Salas, Andrés; Delvasto, Silvio; Gutiérrez, Ruby Mejía de

doi:10.15446/ing.investig.v33n2.39517

Cited by 8 publications

(3 citation statements)

References 22 publications

(25 reference statements)

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“…The percentage of crystalline phases in the GGBFS and FA were analyzed using Rietveld, and the percentage of amorphous fraction was calculated by difference (see Tables 4 and 5). The amorphous properties of the materials used were within acceptable limits and that adequate cementitious properties can be expected [50]. The experimental program consisted of two stages (a) alkali-activated prepared in the first stage, based on a 50% replacement of OPC with GGBFS, FA, and (b) 30% replacement without activation (see Table 6).…”

Section: Methodsmentioning

confidence: 99%

Composite Cements Using Ground Granulated Blast Furnace Slag, Fly Ash, and Geothermal Silica with Alkali Activation

Salas Montoya,

Rodríguez-Barboza,

Colmenero Fonseca

et al. 2023

Buildings

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In recent decades, alkali activated and blended cements have attracted great interest worldwide due to their advantages of low energy cost, high strength, and good durability. This study evaluated the effects of replacing 50% of Portland cement with a mixture of three waste materials: ground granulated blast furnace slag (GGBFS), fly ash (FA), and geothermal waste (GS), with and without external alkaline activation, and activated with different alkali agents: 4 and 7% Na2O equivalent of sodium hydroxide, sodium silicate (water glass), and sodium sulfate. After 90 days of curing, samples were characterized using compressive strength tests, scanning electron microscopy, X-ray diffraction, and thermogravimetric analyses. The results showed that sodium hydroxide caused an alkali–silica reaction and reduced the strength, while sodium silicate and sodium sulfate improved the strength and hydration products formation. Moreover, the addition of fly ash decreased the compressive strength but increased the workability, while the addition of slag and geothermal waste increased strength and densified the matrix with the formation of additional hydration products. The blended cements without activation also showed better performance than pure cement and a more compact matrix of hydration products. The study demonstrated the feasibility of using waste materials to produce blended cements with low energy costs and high durability.

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Section: Methodsmentioning

confidence: 99%

Composite Cements Using Ground Granulated Blast Furnace Slag, Fly Ash, and Geothermal Silica with Alkali Activation

Salas Montoya,

Rodríguez-Barboza,

Colmenero Fonseca

et al. 2023

Buildings

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“…Previous studies used RHA as partial and full replacements to cement to produce a high-performance concrete. Salas et al [14] used the highly reactive RHA and observed that 10% of a high reactive RHA is the optimum replacement level to ordinary cement which enhanced the compressive strength, flexural strength, and elastic modulus of concrete. However, using the RHA requires high water requirement.…”

Section: Introductionmentioning

confidence: 99%

Impact of Incorporating Rice Husk Ash (RHA) into Recycled Concrete Aggregates (RCA) on the Compressive and Flexural Strength of Concrete

Adier,

Silva

2024

E3S Web of Conf.

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This study aimed to assess the strength characteristics of concrete using Recycled Concrete Aggregates (RCA) as full replacement to coarse aggregates and Rice Husk Ash (RHA) as an admixture. The concrete samples were subjected to curing for 7, 14, and 28 days. Specifically, the study evaluated the workability of freshly mixed concrete and compared the compressive and flexural strength with RCA and RHA to normal concrete. Four different treatment mixtures were used with three replicates with varying ratio of RHA to cement: Treatment 1 (1 cement: ¾ RHA), Treatment 2 (1 cement: ½ RHA), Treatment 3 (1 cement: ¼ RHA). In all cases, RCA completely replaced natural coarse aggregates. The results indicated that the slump which measures the workability of the RCA concrete met the desired standard specifications. Additionally, the RCA concrete with the highest RHA content obtained the highest compressive and flexural strength on the 28th day test but did not exceed the control. Furthermore, the study revealed that the concrete specimens could handle maximum loads for flexure rather than compression load.

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“…However, the effect of this type of ash on the properties of high-performance concrete has not been studied in detail. There are only a few studies on RHA with acid washing [38,42,[44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

High Performance Concretes with Highly Reactive Rice Husk Ash and Silica Fume

2023

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The search for new sources of high-quality non-crystalline silica as a construction material for high-performance concrete has attracted the interest of researchers for several decades. Numerous investigations have shown that highly reactive silica can be produced from rice husk, an agricultural waste that is abundantly available in the world. Among others, the production of rice husk ash (RHA) by chemical washing with hydrochloric acid prior to the controlled combustion process has been reported to provide higher reactivity because such a process removes alkali metal impurities from RHA and provides an amorphous structure with higher surface area. This paper presents an experimental work in which a highly reactive rice husk ash (TRHA) is prepared and evaluated as a replacement for Portland cement in high-performance concretes. The performance of RHA and TRHA was compared with that of conventional silica fume (SF). Experimental results showed that the increase in compressive strength of concrete with TRHA was clearly observed at all ages, generally higher than 20% of the strength obtained with the control concrete. The increase in flexural strength was even more significant, showing that concrete with RHA, TRHA and SF increased by 20%, 46%, and 36%, respectively. Some synergistic effect was observed when polyethylene–polypropylene fiber was used for concrete with TRHA and SF. The chloride ion penetration results also indicated that the use of TRHA had similar performance compared to that of SF. Based on the results of statistical analysis, the performance of TRHA is found to be identical to that of SF. The use of TRHA should be further promoted considering the economic and environmental impact that will be achieved by utilizing agricultural waste.

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Developing high-performance concrete incorporating highly-reactive rice husk ash

Cited by 8 publications

References 22 publications

Composite Cements Using Ground Granulated Blast Furnace Slag, Fly Ash, and Geothermal Silica with Alkali Activation

Composite Cements Using Ground Granulated Blast Furnace Slag, Fly Ash, and Geothermal Silica with Alkali Activation

Impact of Incorporating Rice Husk Ash (RHA) into Recycled Concrete Aggregates (RCA) on the Compressive and Flexural Strength of Concrete

High Performance Concretes with Highly Reactive Rice Husk Ash and Silica Fume

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