Article
Energy & Fuels
Hossein Beidaghy Dizaji, Thomas Zeng, Hieronymus Hoelzig, Jens Bauer, Gert Kloess, Dirk Enke
Summary: The study investigated ash transformation mechanisms in silica-rich biomass fuels, revealing the impact of impurities on the atomic structure of silica, leading to altered ash melting behavior and viscosity. Chemical water washing, acid leaching, and blending rice straw with rice husk were found to strongly influence the chemical composition of ashes and improve ash melting behavior.
Article
Construction & Building Technology
Mana Alyami, Ibrahim Y. Hakeem, Mohamed Amin, Abdullah M. Zeyad, Bassam A. Tayeh, Ibrahim Saad Agwa
Summary: The study focuses on using agricultural waste ash as a partial substitute for OPC to produce sustainable ultra-high-performance concrete (SUHPC). Different agricultural residue ashes (RHA, SLA, and OWA) were used to replace 50% of the OPC weight. The effects on the properties of UHPC were evaluated, including slump flow, compressive strength, tensile strength, flexural strength, water sorptivity, permeability, and chloride penetration. The results showed that SUHPC can be prepared with a compressive strength of more than 155 MPa when 50% of the OPC is replaced with (SLA 25% + RHA 25%).
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Environmental Studies
Seong Hye Son, Hae In Lee, Won Chul Cho, Ui Myung Chung, Ho Won Ra, Sung Min Yoon, Jae Goo Lee, Young Woo Rhee, Myung Won Seo
Summary: Rice husk is a valuable agricultural biomass that can be used to produce high-purity SiO2 and Si. This study conducted a mechanochemical experiment to convert rice husk ash into porous Si using attrition mill and various acid leaching and heat-treatment conditions. The results showed the possibility of using eco-friendly lactic acid instead of harmful hydrochloric acid, the conversion of heat-treated GRHA to Si without acid leaching, and the importance of carbon content in RHA and GRHA for Si conversion.
ENERGY & ENVIRONMENT
(2023)
Article
Construction & Building Technology
K. Dhasindrakrishna, Sayanthan Ramakrishnan, Kirubajiny Pasupathy, Jay Sanjayan
Summary: This study investigates the potential of intumescent alkali-activated rice husk ash as an alternative fire-resistant building material. The results show that the alkali-activated RHA demonstrates better insulation capacity at high temperatures compared to conventional aerated fly ash-based geopolymer materials.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Yali Wang, Xiaoning Han, Meina Chen, Suping Cui, Xiaoyu Ma, Liwei Hao
Summary: The study focused on the performance and mechanism of modified rice husk ash-carbide slag composite absorbent in desulfurization and denitrification applications, showing an increased efficiency at 700 degrees Celsius. The formation of fibrous calcium silicate and calcium silicoaluminate hydrates during hydration process led to a larger specific surface area of the absorbent and more reactive sites, enhancing the denitrification reaction.
Article
Construction & Building Technology
Nwakaego C. Onyenokporo, Ahmad Taki, Luis Z. Montalvo, Muyiwa Oyinlola
Summary: Due to climate change, there is a growing interest in finding alternative building materials to improve energy efficiency and reduce CO2 emissions. This study focuses on the thermal performance of cement-based masonry blocks incorporated with rice husks, which have shown a significant reduction in U-values and thermal conductivities. The results suggest that using these blocks can improve building energy consumption, occupants' thermal comfort, and reduce CO2 emissions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Gokhan Kaplan, Mohamed A. Salem Elmekahal
Summary: Sustainable solutions to decrease environmental damage caused by greenhouse gases and CO2 emissions are explored in this study, with a focus on using alternative materials such as rice husk ash. The research investigates the durability and mechanical properties of lightweight, high-performance cement-based composites, finding that specific mix ratios significantly impact the performance of the composites. By utilizing up to 25% RHA, the performance of cement-based composites can be enhanced.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Construction & Building Technology
Raja Mistry, Tapas Kumar Roy
Summary: The study found that bituminous mix containing RHA and FA-F performed significantly well at relatively lower optimum bitumen content. In addition, RHA showed a homogeneous dispersion of bee structure in the mastic and exhibited the highest adhesion force.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Andres Salas Montoya, Chul-Woo Chung, Ji-Hyun Kim
Summary: The search for high-quality non-crystalline silica for high-performance concrete has led researchers to investigate the use of rice husk ash (RHA). This paper presents an experimental study on the use of highly reactive RHA as a replacement for Portland cement, comparing its performance with conventional silica fume (SF). The results show that concrete with RHA exhibits improved compressive and flexural strength, and comparable chloride ion penetration resistance to SF.
Review
Chemistry, Physical
Hamisah Ismail, Hasmaliza Mohamad
Summary: There is currently a growing interest in utilizing agricultural waste, with a focus on processing rice husk ash or rice straw ash into biocompatible products used in biomedical implants, leading to the effective conversion of high-value products and reducing environmental pollution.
Article
Construction & Building Technology
Musa Adamu, Kingsley Oyime Ayeni, Sadi Ibarahim Haruna, Yasser El-Husseini Ibrahim Mansour, Sani Haruna
Summary: Pervious concrete is a special type of concrete used for stormwater management due to its high porosity and permeability, but its low mechanical strength is a drawback. The study used calcium carbide waste and rice husk ash to partially replace Portland cement, finding negative effects on the durability of pervious concrete, with the best performance achieved with 0% RHA and 5% CCW.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Qiang Su, Jinming Xu
Summary: The use of glass sand and rice husk ash in concrete production saves natural sand resources and promotes waste recycling. The pozzolanic effect of rice husk ash reduces the alkali-silica reaction caused by glass sand and cement slurry. The addition of glass sand improves tensile strength and cyclic compression performance, while rice husk ash enhances compressive and splitting tensile strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Mareike Thiedeitz, Benjamin Ostermaier
Summary: This study investigated the properties of mortars containing Rice Husk Ash (RHA) as supplementary cementitious material (SCM) for sustainable construction. The results showed that mortars with 25% substitution of cement by RHA exhibited higher strength, durability, and a denser microstructure compared to the control samples. RHA demonstrated a strong pozzolanic reaction, leading to enhanced strength development and improved durability of concrete. These findings provide important insights into the usability of RHA in concrete and its potential for sustainable construction.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Construction & Building Technology
Saloni, Parveen, Thong M Pham, Yee Yan Lim, S. S. Pradhan, Jatin, Jatin Kumar
Summary: This paper presents a scientific attempt to study the performance of sustainable geopolymer concrete based on rice husk ash and ultra-fine slag, with corn cob ash used as a substitute. The study found that corn cob ash and slag significantly improved the strength and durability of concrete, suggesting potential for replacing traditional concrete in structural applications.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Kumar Gedela Santhosh, Sk M. Subhani, A. Bahurudeen
Summary: The disposal of agricultural waste ashes has caused severe pollution worldwide due to the rapid implementation of biomass-based power plants. However, these ashes can be effectively used as an alternative material to conventional cement. A comprehensive review on the performance of two widely available agricultural waste ashes, palm oil fuel ash and rice husk ash, in concrete is attempted. The physical, chemical, microstructural, and pozzolanic characteristics of the ashes are systematically reviewed. The optimal replacement level for both ashes in concrete is recommended. Superior performance in terms of workability and resistance against chloride ion penetration, acid, and sulphate attack is observed for the palm oil fuel ash and rice husk ash blended concretes compared to conventional concrete.
JOURNAL OF CLEANER PRODUCTION
(2022)