Effect of grinding on chemical and physical properties of rice husk ash

Rukzon, Sumrerng; Chindaprasirt, Prinya; Mahachai, Rattana

doi:10.1016/s1674-4799(09)60041-8

Cited by 168 publications

(74 citation statements)

References 8 publications

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“…An increase in density for grinding was identified for FA1 and FA2. Similar findings have been reported (Payá et al 1995), (Rukzon et al 2009) for grinding rice husk ash and coal fly ash. Higher SSA, increased density and lower water demand (as shown in Table 2) for GA assisted grinding compared to non-GA grinding indicates the beneficial role of gypsum.…”

Section: Physico-chemical Activation By Low Intensive Grindingsupporting

confidence: 89%

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Sadique

Al-Nageim

2012

ACT

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The hydration kinetics of a ternary system containing high lime fly ash activated with alkali sulphate rich fly ash has been studied. The effect of low intensive mechanical activation of fly ashes influencing the particle packing and water demand was undertaken. A ternary blend of fly ashes and silica fume was found to show improved bond strength between the binder paste and aggregate rather than the binder paste matrix with progressive hydration after 90 days. Analogous physico-chemical properties of the developed ternary blend with the control cement were revealed. Quick dissolution of K + , Na + and SO 4 2-into the liquid phase as well as consumption of Ca 2+ by silica fume in a high-pH environment were the predominant factors for producing a dense non-expansive hydration product by the ternary blend.

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Section: Physico-chemical Activation By Low Intensive Grindingsupporting

confidence: 89%

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Sadique

Al-Nageim

2012

ACT

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“…This suggests that stabilization of Pb through precipitation of lead as carbonate and phosphate is a possibility. Typical XRF chemical characterization of RH ash revealed that it contains up to 92% SiO 2 [31]. The result of this study also showed that RHB contained a high amount (9780 mg/kg) of Ca (Table 1).…”

Section: Effects Of Amendment On Post-harvest Soil Pb Concentrationsupporting

confidence: 58%

Stabilization of Pb in Pb Smelting Slag-Contaminated Soil by Compostmodified Bio Chars and their Effects on Maize Plant Growth

OO¹

2015

J Bioremed Biodeg

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Compost has been used to stabilize lead (Pb) in soil. However, compost contains a high level of dissolved organic matter (DOM) which may make Pb bioavailable in plant and thereby limiting its effectiveness and application. Addition of bio char to compost can reduce this effect. Rice husk (RH) and Cashew nut shell (CNS) bio chars and compost-modified bio chars were used in comparison to compost for stabilizing Pb in lead smelting slag (LSS)-contaminated soil (Pb=18,300 mg/kg) in Nigeria. Efficiency of Pb stabilization in control and amended soils was assessed using CaCl 2 batch leaching experiment and plant performance. In pot experiments, maize plant was grown on the contaminated soil and on soil treated with minimum and optimum doses of the amendments singly and in combination for 6 weeks. Agronomical and chemical parameters of the plants were measured. CaCl 2 -extractable Pb in the untreated soil was reduced from 60 mg/kg to 0.55 mg/kg in RHB amended soils and non-detectable in other amended soils. RH-bio char/compost increased plant height, number of leaf and leaf area more than the others. Similarly, at minimum rate, it reduced root and shoot Pb by 91 and 86.0% respectively. Compost-modified rice husk bio char stabilized Pb in lead smelting slag contaminated soil, reduced Pb plant uptake and improved plant growth. Lead stabilization through the use of rice husk bio char with compost may be a green method for remediation of lead smelting slag-contaminated soil.

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Section: Flexural Strengthmentioning

confidence: 97%

“…Nevertheless, the incorporation of POCP at any replacement levels lowered the flexural strength compared to the control specimens, and this could be attributed to the lower pozzolanic activity of POCP compared to other pozzolanic materials [62]. The substantial increase in the later-age flexural strength of mixes with incorporation of RHA and POFA as shown in Figure 17 could be attributed chemically to the pozzolanic reaction, which improves the interfacial bonding between the aggregates and pastes and physically due to the filler effect and enhanced microstructure of the matrix [63,64]. Figure 18 demonstrates the relationship between the flexural strength of RA concrete and its compressive strength compared to the relation suggested by ACI 318-14 [61] in addition to the relation established by Xiao et al (2006) [65], who reviewed the flexural strength of the RA concrete obtained by various researchers.…”

Section: Flexural Strengthmentioning

confidence: 97%

Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete

et al. 2017

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Abstract:The utilization of traditional supplementary cementitious materials (SCMs) has become more intense in the concrete industry due to their better long-term properties. This research evaluates the fresh and hardened properties of concrete that was developed using a high amount of recycled aggregate (RA) incorporated with sustainable SCMs. Rice husk ash (RHA), palm oil fuel ash (POFA) and palm oil clinker powder (POCP) were used as SCMs at 10%, 20% and 30% cement replacement levels to investigate their positive role in the performance of RA concrete. The results showed that the 10% replacement level of cement by RHA produced the highest strength at all ages tested. Although POFA and POCP were found to negatively affect the strengths at an early age, the hardened properties showed improvement after a relatively long curing time of 90 days. In addition, the targeted compressive strength of 30 MPa was achieved by using SCMs at levels up to 30%. Overall, the sustainable SCMs can reduce the quantity of cement required for concrete production, as well as reduce the conventional cement with the industrial by-products, which are considered as waste materials; thus, the concrete produced using up to 30% of SCMs as a replacement for cement could be considered as more environmentally-friendly concrete.

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Effect of grinding on chemical and physical properties of rice husk ash

Cited by 168 publications

References 8 publications

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Stabilization of Pb in Pb Smelting Slag-Contaminated Soil by Compostmodified Bio Chars and their Effects on Maize Plant Growth

Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete

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