Rice Husk Ash in Concrete

Abstract

This study conducted an extensive literature review on rice husk ash (RHA), with a focus on its particle properties and their effects on the fresh, mechanical, and durability properties of concrete when used as a partial cement replacement. The pozzolanic property of RHA is determined by its amorphous silica content, specific surface area, and particle fineness, which can be improved by using controlled combustion and grinding for use in concrete. RHA particle microstructures are typically irregular in shape, with porous structures on the surface, non-uniform in dispersion, and discrete throughout. Because RHA has a finer particle size than cement, the RHA blended cement concrete performs well in terms of fresh properties (workability, consistency, and setting time). Due to the involvement of amorphous silica reactions, the mechanical properties (compressive, tensile, and flexural strength) of RHA-containing concrete increase with increasing RHA content up to a certain optimum level. Furthermore, the use of RHA improved the durability properties of concrete (water absorption, chloride resistance, corrosion resistance, and sulphate resistance). RHA has the potential to replace cement by up to 10% to 20% without compromising the concrete performance due to its high pozzolanic properties. The use of RHA as a partial cement replacement in concrete can thus provide additional environmental benefits, such as resource conservation and agricultural waste management, while also contributing to a circular economy in the construction industry.

Development of sustainable high performance geopolymer concrete and mortar using agricultural biomass—A strength performance and sustainability analysis

“…The procedures applied for burning, processing, and grinding affect the microstructure of RHA (Endale et al, 2022). As a result, RHA particles are often amorphous, have micro-fragments with porous structures, and are extensively distributed (Figure 5A) (Endale et al, 2022). Table 1 lists the chemical composition of the binding materials.…”

Enhancing Mortar Properties through Thermoactivated Recycled Concrete Cement

“…This material has both a hydraulic and pozzolanic nature since it has a significant amount of both CaO and SiO 2 . The pozzolanic reactivity of materials is primarily determined by their silica content [29]. Other oxides, such as MgO, K 2 O, and Na 2 O contents, were found to be within a limit specified in ASTM C618 [30].…”

Sustainable Concrete Production: Utilizing Cow Dung Ash and Corn Stalk Ash as Eco-Friendly Alternatives

“…This method conserves natural resources, encourages waste diversion, and supports environmentally sustainable waste management techniques. Studies have explored the viability of supplementary cementitious materials from industrial and agricultural leftovers [5][6][7][8][9][10][11]. Waste materials replace traditional concrete manufacturing ingredients with waste resources like recycled aggregates and coconut fibers [12][13][14][15][16][17][18].…”