Results 241 to 250 of about 43,653 (290)
Some of the next articles are maybe not open access.
1998
The properties of plastics can be significantly modified by the incorporation of fillers. Rice husk ash (RHA) fillers are derived from rice husks, which are usually regarded as agricultural waste and an environmental hazard. Rice husk, when burnt in open air outside the rice mill, yields two types of ash that can serve as fillers in plastics materials.
M. Y. Ahmad Fuad +3 more
openaire +1 more source
The properties of plastics can be significantly modified by the incorporation of fillers. Rice husk ash (RHA) fillers are derived from rice husks, which are usually regarded as agricultural waste and an environmental hazard. Rice husk, when burnt in open air outside the rice mill, yields two types of ash that can serve as fillers in plastics materials.
M. Y. Ahmad Fuad +3 more
openaire +1 more source
Cement and Concrete Research, 1986
Effect of lime:silica ratio on the kinetics of the reaction of silica with saturated lime has been investigated. Below C/S=0.65 the reaction does not proceed to completion and even in the presence of a large excess of silica only 90% lime is consumed. A parameter, lime reactivity index, has been defined to quantity the reactive silica present in rice ...
James, Jose, Rao, M Subba
openaire +1 more source
Effect of lime:silica ratio on the kinetics of the reaction of silica with saturated lime has been investigated. Below C/S=0.65 the reaction does not proceed to completion and even in the presence of a large excess of silica only 90% lime is consumed. A parameter, lime reactivity index, has been defined to quantity the reactive silica present in rice ...
James, Jose, Rao, M Subba
openaire +1 more source
2011
Rice husk ash (RHA) is generated by burning rice husk. On burning, cellulose and lignin are removed leaving behind silica ash. The controlled temperature and environment of burning yields better quality of rice-husk ash as its particle size and specific surface area are dependent on burning condition.
Rafat Siddique, Mohammad Iqbal Khan
openaire +1 more source
Rice husk ash (RHA) is generated by burning rice husk. On burning, cellulose and lignin are removed leaving behind silica ash. The controlled temperature and environment of burning yields better quality of rice-husk ash as its particle size and specific surface area are dependent on burning condition.
Rafat Siddique, Mohammad Iqbal Khan
openaire +1 more source
2017
This chapter reviews the performance of rice husk ash (RHA) as partial cement replace in ordinary Portland cement concrete. After pyroprocessing with controlled combustion, highly pozzolanic RHA can be produced. Due to the high specific surface area and pozzolanic properties, RHA shows very good performance as a supplementary cementitious material in ...
Guang Ye, Hao Huang, Nguyen Van Tuan
openaire +1 more source
This chapter reviews the performance of rice husk ash (RHA) as partial cement replace in ordinary Portland cement concrete. After pyroprocessing with controlled combustion, highly pozzolanic RHA can be produced. Due to the high specific surface area and pozzolanic properties, RHA shows very good performance as a supplementary cementitious material in ...
Guang Ye, Hao Huang, Nguyen Van Tuan
openaire +1 more source
2013
Rice-husk (RH) is an agricultural by-product material. It constitutes about 20 % of the weight of rice. It contains about 50 % cellulose, 25–30 % lignin, and 15–20 % of silica. When rice-husk is burnt rice-husk ash (RHA) is generated. On burning, cellulose and lignin are removed leaving behind silica ash.
openaire +1 more source
Rice-husk (RH) is an agricultural by-product material. It constitutes about 20 % of the weight of rice. It contains about 50 % cellulose, 25–30 % lignin, and 15–20 % of silica. When rice-husk is burnt rice-husk ash (RHA) is generated. On burning, cellulose and lignin are removed leaving behind silica ash.
openaire +1 more source
Iron incorporated heterogeneous catalyst from rice husk ash
Journal of Colloid and Interface Science, 2006Silica supported iron catalyst was prepared from rice husk ash (RHA) via the sol-gel technique using an aqueous solution of iron(III) salt in 3.0 M HNO3. The sample was dried at 110 degrees C and labeled as RHA-Fe. A sample of RHA-Fe was calcined at 700 degrees C for 5 h and labeled as RHA-Fe700.
Farook, Adam +2 more
openaire +2 more sources
Conversion of rice husk ash to zeolite beta
Waste Management, 2006White rice husk ash (RHA), an agriculture waste containing crystalline tridymite and alpha-cristobalite, was used as a silica source for zeolite Beta synthesis. The crystallization of zeolite Beta from RHA at 150 degrees C in the presence of tetraethylammonium hydroxide was monitored by XRD, FTIR and (29)Si MAS NMR techniques. It was found that zeolite
Didik, Prasetyoko +4 more
openaire +2 more sources
Environmental Science & Technology, 2013
Silver nanoparticle (AgNP)-impregnated rice husks/rice hush ash (RHs/RHA) were successfully synthesized, and their potential application as antibacterial materials in water disinfection was investigated with particular attention given to the use of both white rice husk ash (WRHA) and black rice husk ash (BRHA) produced by the combustion of RHs as AgNP ...
He, D +3 more
openaire +3 more sources
Silver nanoparticle (AgNP)-impregnated rice husks/rice hush ash (RHs/RHA) were successfully synthesized, and their potential application as antibacterial materials in water disinfection was investigated with particular attention given to the use of both white rice husk ash (WRHA) and black rice husk ash (BRHA) produced by the combustion of RHs as AgNP ...
He, D +3 more
openaire +3 more sources
Composites Part B: Engineering, 2013
Abstract Superabsorbent hydrogel composites based on poly(acrylamide- co -acrylate) and rice husk ash (RHA) were prepared by free-radical copolymerization in aqueous media, using N , N -methylenebisacrylamide (MBA), as crosslinker and potassium persulfate (K 2 S 2 O 8 ), as initiator. The effect of calcination temperatures (400–900 °C) for obtaining
Jean de S. Cândido +6 more
openaire +1 more source
Abstract Superabsorbent hydrogel composites based on poly(acrylamide- co -acrylate) and rice husk ash (RHA) were prepared by free-radical copolymerization in aqueous media, using N , N -methylenebisacrylamide (MBA), as crosslinker and potassium persulfate (K 2 S 2 O 8 ), as initiator. The effect of calcination temperatures (400–900 °C) for obtaining
Jean de S. Cândido +6 more
openaire +1 more source
Polysiloxane from rice husk ash
Polysiloxane was prepared from rice husk ash or pure silicas by one step reaction (condensation reaction), with an amine (triethanolamine or diethanolamine) as a catalyst and reactant in ethylene glycol. The reaction temperature was varied between at 100-200℃, mole ratio of silica and amine between 1:0.25-1:1.5 and reaction time between 12-54 hour. Theopenaire +1 more source