**2. Methods**

For the quantitative evaluation of the various features of the bibliographic data, this study carried out the scientometric analysis of the bibliographic data [87–89]. Numerous papers have been written on the issue, and it is critical to use a search engine that is reputable. Scopus and Web of Science are two very accurate search engines that are particularly well-suited for this purpose [90,91]. The bibliographic data for this study on RHA concrete were gathered using Scopus, which comes highly recommended by academics [92,93]. As

of March 2022, a Scopus search for "rice husk ash concrete" found 1234 articles. Numerous filter preferences were employed to eradicate superfluous documents. The document types "journal article", "conference paper", "journal review", and "conference review" were selected. "Journal" and "conference proceeding" were chosen as the "source type". The "publication year" restriction was set to "2021", and the "language" constraint was set to "English". For further examination, the "subject areas" of "engineering", "material science", and "environmental science" were selected. A total of 917 records were kept following the application of these requirements. Numerous researchers have likewise reported on the same technique [94–96].

Scientometric investigations employ scientific mapping, a technique developed by academics for the purpose of analyzing bibliometric information [97]. Scopus records were saved in the Comma Separated Values (CSV) (see Supplementary Materials) files for further evaluation using appropriate computer software. VOSviewer (version: 1.6.17) was employed to generate the scientific visualization and quantitative assessment of the literature from the retrieved records. VOSviewer is an easily available and open-source mapping tool that is broadly employed across a range of areas and is well-suggested by academics [98–101]. As a result, the current study's goals were satisfied through the use of the VOSviewer. The obtained CSV files were loaded into the VOSviewer, and additional assessment was performed while retaining data integrity and consistency. During the bibliographic assessment, the sources of publications, the highly regularly appearing keywords, the scholars with the most publications and citations, and the country's participation were all assessed. The many facets, their relationships, and co-occurrence were shown graphically, while their statistical figures were reported in tables. The flowchart of the scientometric strategy is depicted in Figure 2.

**Figure 2.** Sequence of the research methods.
