The addition of RHA to concrete can have various effects on its properties. Some of the effects of RHA on concrete properties include: Strength enhancement: RHA contains high levels of silica, which can react with alkaline activators to form a geopolymer gel. This gel contributes to the development of strength in geopolymer concrete, resulting in improved compressive and flexural strength. Increased durability: The incorporation of RHA can enhance the durability of concrete. Geopolymerization reactions form a denser microstructure with reduced porosity, leading to improved resistance against chloride ion penetration, sulfate attack, and carbonation. Reduced heat of hydration: Geopolymer concrete with RHA tends to exhibit lower heat release during the early stages of hydration compared to ordinary Portland cement concrete. This can be beneficial in large-scale concrete placements or in situations where controlling temperature rise is important. Improved workability: RHA can enhance the workability of geopolymer concrete mixtures. The fine particle size and pozzolanic properties of RHA contribute to better particle packing, improved water dispersion, and increased flowability of fresh concrete. Environmental benefits: The use of RHA as a supplementary cementitious material in concrete can contribute to the reduction of greenhouse gas emissions. By utilizing RHA, which is a byproduct of the rice milling industry, the consumption of traditional cement can be reduced, resulting in lower carbon dioxide emissions. To find articles specifically addressing the effects of RHA on geopolymer concrete properties, I recommend conducting a literature search using academic databases such as Google Scholar, Scopus, or IEEE Xplore. Keywords such as "rice husk ash," "geopolymer concrete," and "properties" can be used to narrow down the search and find relevant research articles.

Thank you very much sir for all the answers and guidance. This actually fits with my expectations because I am currently working in this area of research.

Rice husk ash (RHA) is a byproduct obtained from the burning of rice husks, and it can be used as a supplementary cementitious material in concrete production. When RHA is incorporated into concrete, it can have several effects on the properties of the resulting material. Some of the effects of rice husk ash silicate on concrete properties are as follows: Pozzolanic activity: Rice husk ash contains a high amount of amorphous silica, which exhibits pozzolanic properties. When RHA is mixed with calcium hydroxide (a byproduct of cement hydration), it reacts to form additional calcium silicate hydrate (C-S-H) gel, contributing to the strength and durability of the concrete. Strength improvement: The pozzolanic reaction between RHA and calcium hydroxide results in the formation of additional C-S-H gel, which fills the pore spaces in concrete. This densification leads to an increase in the strength of the concrete over time. Reduced permeability: The incorporation of RHA in concrete can help reduce its permeability. The additional C-S-H gel formed through the pozzolanic reaction fills the capillary pores, reducing the pathways for water and other aggressive substances to penetrate the concrete. This can enhance the durability of the structure by minimizing the ingress of harmful agents. Enhanced workability: RHA can act as a filler material in concrete, enhancing its workability and reducing the water demand for a given consistency. This can be beneficial during concrete mixing, placing, and finishing operations. Improved chemical resistance: The formation of additional C-S-H gel and the densification of concrete due to RHA can enhance its resistance to chemical attacks, such as those caused by sulfates, chlorides, and acids. This is particularly useful in environments where the concrete is exposed to aggressive substances. Reduction in heat of hydration: RHA has been found to have a pozzolanic effect, which reduces the heat of hydration during the early stages of concrete curing. This can be beneficial in large concrete structures or in hot climates, where excessive heat generation can lead to thermal cracking. It's important to note that the exact effects of RHA on concrete properties can vary depending on factors such as the quality and composition of the RHA, its replacement level in concrete, and the mix design of the concrete itself. Therefore, it is recommended to conduct specific laboratory tests and trials to evaluate the impact of RHA on concrete properties in a given application.

you could have an example in this paper:

Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders

https://www.sciencedirect.com/science/article/abs/pii/S0959652618323564

The effects of rice husk ash (RHA) on concrete properties are as follows:

These effects may vary depending on RHA content, quality, mix design, and curing conditions. Conducting laboratory tests or referring to research studies is recommended for specific applications.

Following are the effects of rice husk ash (RHA) on concrete:

• Due to addition of rice Husk ash, concrete becomes cohesive and more plastic and thus permits easier placing and finishing of concrete. It also increases workability of concrete.
• The bulk density of RHA concrete is reducing with increase in RHA content.
• The pozzolonic activity of rice husk ash is not only effective in enhance the concrete strength, but also in improving the impermeability characteristics of concrete.
• The use of rice husk ash as an alternative for cement & as additive to reduce corrosion and increase durability of concrete strength.