Study on the pozzolanic properties of rice husk ash by hydrochloric acid pretreatment

Feng, Qingge; Yamamichi, Hirohito; Shoya, Masami; Sugita, Shuichi

doi:10.1016/j.cemconres.2003.09.005

Cited by 190 publications

(79 citation statements)

References 6 publications

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“…In this case, the 2 min-decrease was more significantly intense in HL-SCSA. Similar conductivity results were reported by Feng et al 20 in a study using HCl-pretreated RHA. Table 5 also shows the results of the modified Chapelle test.…”

Section: Pozzolanic Activity Of Ashessupporting

confidence: 80%

“…As reported by some previous studies about RHA, acid pretreatment prior to calcination was appropriate to obtain high specific surface ashes. 20,22 This behavior was largely due to the removal of metallic oxides, mainly K 2 O, which enabled a better removal of volatiles and organic materials during the calcination process. 22 In fact, the specific surface area was greatly affected by the acid leaching of straw.…”

Section: Particle Size Distribution Bet Specific Surface Area and Smentioning

confidence: 99%

“…In this case, a 40-g SCS sample was washed with 1 L of boiled water for 2 h, filtered through 41 Whitman filter paper, and oven-dried at 80 °C for 24 h. The second pretreatment was an acid leaching based on a study on the pozzolanic properties of RHA by hydrochloric acid (HCl) pretreatments. 20 Thus, 40 g of dried SCS were firstly maintained in 1 L of 1 mol L -1 HCl (analytical grade, Sigma-Aldrich) aqueous solution at 90 °C for 2 h. After that, the solution with SCS was filtered and rinsed eight times with distilled water. This repetition was found to be necessary in order to remove the remaining acidic impurity.…”

Section: Pretreatment Of Straw Samples and Production Of Ashesmentioning

confidence: 99%

“…In this case, it is possible to produce a high-purity amorphous silica with high specific surface area by removing carbon and other metallic impurities before calcination. 19,20 It has been found that potassium oxide from rice husk causes the negative effect of the silica surface melting and the crystallization of amorphous silica into cristobalite and tridymite. 21,22 Considering that there are few studies on the properties of SCSA and that works investigating the influence of pretreatment of sugar cane bagasse and straw ashes on the pozzolanic activity are rare, this research aims at studying the feasibility of producing pozzolanic materials from sugar cane straw submitted to different pretreatments.…”

Section: Introductionmentioning

confidence: 99%

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Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments

Cordeiro¹,

Vieira²,

Lopes³

2017

Quim. Nova

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This work systematically describes a laboratory study on different pretreatments of sugar cane straw to produce pozzolanic ash. Two procedures were used to accelerate the hydrolysis of celluloses and hemicelluloses and remove metallic impurities present in significant levels in sugar cane straw: hot water washing and acid leaching. Proximate analysis by thermogravimetry was carried out to cover volatile matter, fixed carbon, and ash content of the different straws. Detailed measurements of X-ray diffraction, oxide percentages, loss on ignition, and BET specific surface area were performed to compare hot water washed, acid leached, and nonpretreated ashes, after controlled processes of burning and grinding. The pozzolanic activity of the ashes was evaluated from the modified Chapelle and electrical conductivity methods. The results revealed that ashes with a high content of amorphous silica were produced, in spite of the straw pretreatments. However, both straw pretreatments induced a significant increase in pozzolanic activity, mainly associated with the removal of impurities, especially CaO, SO 3 , K 2 O, and carbon compounds. The effect of the hot water washing treatment was relatively small in relation to the acid leaching, but the hot washed ash was significantly more pozzolanic than non-treated ash.

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Section: Pozzolanic Activity Of Ashessupporting

confidence: 80%

Section: Particle Size Distribution Bet Specific Surface Area and Smentioning

confidence: 99%

Section: Pretreatment Of Straw Samples and Production Of Ashesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments

Cordeiro¹,

Vieira²,

Lopes³

2017

Quim. Nova

View full text Add to dashboard Cite

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“…Feng et al (2004) confirmed the suitability of the method to determine the pozzolanic activity of rice husk ash. The method consists of two steps: initially, the electrical conductivity of a saturated calcium hydroxide solution is measured.…”

Section: Experimental Methodsmentioning

confidence: 53%

Effect of Rice Husk Ash Properties on the Early Age and Long Term Strength of Mortar

Rasoul

Günzel

Rafiq

2017

High Tech Concrete: Where Technology and Engineering Meet

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This paper presents an experimental study on the effect of chemical composition and physical properties of rice husk ash (RHA) on the strength of mortar. The aim of this investigation was to establish the optimal RHA replacement levels as blending component in cement. Four different types of RHA (A, B, C and D) were used of which RHA-C and D had the highest content of amorphous silica. Compressive and tensile strength and workability of the mixes were compared with control OPC samples. Results show that the early age (7days) strength of RHA blended mortar samples was lower than the compressive and tensile strength of the OPC control samples. However, the 28 day strength of samples with up to 20% RHA-C and RHA-D was higher than that of the control samples. The 90 day strength of all blended samples with up to 40% RHA was higher than that of the control samples. RHA-D performed best in the experiments with a compressive strength increase of 16% at 20% RHA replacement and an increase of compressive strength of 8.6% at 40% RHA replacement. The results at 90 days show that cement could be replaced with up to 50% RHA with only a small reduction in strength compared to OPC mortar. From the results it was found that the content of amorphous silica has the biggest influence on the strength of the mortar samples while the workability was higher for samples with finer grained RHA.

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Mechanical properties and thermal stability of rice husk ash filled epoxy foams

Stefani

Cyras

Barchi

et al. 2006

J of Applied Polymer Sci

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Mechanical properties and thermal stability of epoxy foams filled with white and black rice husk ash were studied. Epoxy foams were prepared from a commercial system and filled with different amounts of both the ashes (0, 6.8, 12.8, 18.0, and 22.7 wt %). The incorporation of both the ashes modified the final morphology of the foam, decreasing the average cell size and increasing the number of cells per volume unit. For all filler percentages used, the specific modulus and strength results showed that the white ash is more effective as reinforcing agent than the black ash.The initial degradation temperature was not affected by the content and type of ash used as the filler. The integral procedure decomposition temperature, weight loss, and char residue results were related to the ash type and atmosphere used in the thermogravimetric analysis.

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Study on the pozzolanic properties of rice husk ash by hydrochloric acid pretreatment

Cited by 190 publications

References 6 publications

Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments

Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments

Effect of Rice Husk Ash Properties on the Early Age and Long Term Strength of Mortar

Mechanical properties and thermal stability of rice husk ash filled epoxy foams

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