Rice husk derived waste materials as partial cement replacement in lightweight concrete

Abstract

Concrete is one of the most widely used building materials in the world due to its versatility and durability. The main ingredient of concrete is cement which releases large quantities of CO 2 into the atmosphere during its manufacturing process. Due to lack of availability of construction materials such as coarse aggregate and fine aggregate, the construction cost is increasing day by day. This problem can be solved by replacing conventional materials used in concrete with alternate materials without compromising the strength requirements. Past studies focused on individual replacement of cement with metakaolin, fine aggregates with stone dust, coarse aggregate with waste crushed glass and coconut shells etc,. In present study, performance of concrete is studied by replacing cement partially with Metakaolin, fine aggregate partially with quarry dust and crushed glass. Keeping 10% Metakaolin and 30% Quarry dust as optimum percentages from the literature, the percentage of crushed glass is varied and the performance of concrete has been studied. From the compressive strength results, it has been observed that 20% of fine aggregate replaced with crushed glass performed better and 10% of fine aggregate replaced with crushed glass was performed better against tensile strength.

Development of an Amorphous Silica from Rice Husk Waste

“…Furthermore, the strength gaining percentage is above the standards demarcated by the ASTM C 618-03 as shown in Table III. Such strength gaining pattern is validated by [22,23].…”

Use of biotechnological approaches to add value to rice hulls

“…The resulting complexed substances change according to burn temperature, and these variabilities in the ash composition modify the biotechnological approach that can be developed . The difficulty to control the burn temperature in the boilers also hampers the ash utilization in bioprocess and as organic fertilizers for agriculture …”

“…19 The difficulty to control the burn temperature in the boilers also hampers the ash utilization in bioprocess and as organic fertilizers for agriculture. 9,21 4 | BIOTECHNOLOGICAL USES OF RH AND ITS ASHES…”

“…Its main components are silica (18.8–22.3%), lignin (8–20%), cellulose (28–38%), protein (1.9–3.0%), fat (0.3–0.8%) and nutrients (9.3–9.5%) . Due to such composition, RH presents high hardness, strength, fibrosity, and abrasive walls, which turn this residue very difficult to natural degradation in the environment . The increase in rice production generates an environmental problem with the RH accumulation.…”

Performance of Fly Ash Geopolymer Concrete Incorporating Bamboo Ash at Elevated Temperature

“…This waste is being mainly produced from gardens and rice fields. The majority of previous research involving agriculture waste involved Palm Oil Fuel Ash (POFA) [14,15,16] and Rice Husk Ash (RHA) [17,18,19] as binders. Navid Ranjbar et al, [20] have conducted an experiment regarding the performance of POFA and fly ash (FA) based geopolymer mortar exposed to elevated temperatures.…”