Scholarlink

<p>Past studies have reported the use of rice husk ash (RHA)-based activators instead of traditional activators for geopolymer manufacturing. However, studies related to the use of RHA in its original state remain highly limited. This paper reports experimental results on geopolymer mortars prepared with RHA-based alkaline activator using fly ash (FA) and ground granulated blast furnace slag (GGBS) as precursors. Unlike past studies, the activator was prepared by the addition of RHA to NaOH solution with no pre-processing of RHA. The resulting mortars were tested to comprehend the compressive strength development and microstructure characteristics. The mortars prepared with the synthesized activator attained 28-day compressive strength of 56&#xa0;MPa. Additionally, mortars made with commercial activator were considered for comparison purposes. In both cases, X-ray diffraction (XRD) results revealed the existence of quartz, albite, and tobermorite as mineral phases in the matrix. The fourier transform infrared spectroscopy (FTIR) results indicated that similar bond formation occurred in both matrices; however, the peak at 609&#xa0;cm-1 was only seen RHA/NaOH-based matrix due to presence of sulfides in the activator. The field emission scanning electron microscopy (FESEM) results confirmed the presence of geopolymer gels and tobermorite phases in the matrix. Furthermore, thermogravimetric analysis (TGA) provided insights regarding the thermal stability of mortars until 1000 ℃ wherein it was noticed that beyond 700&#xa0;°C, the mass loss stabilizes at around 9.5%. The outcome of this study underscores the feasibility of RHA/NaOH-based solution in geopolymer applications, thereby contributing to a low-carbon future.<!--Query ID="Q1" Text="Please check and confirm if the inserted citation of Table 6 is correct. If not, please suggest an alternate citation." Resolved="yes"--></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Compressive Strength and Microstructural Properties of Geopolymer Binder Manufactured with Rice Husk Ash-Based Alkaline Activator at Room Temperature

  • 期刊论文

  • 发表日期：

    2025年6月26日

查看全文
  • Jyotirmoy Mishra,
  • Smruti Sudeshna Mohapatra,
  • Bharadwaj Nanda,
  • Sanjaya Kumar Patro

摘要

Past studies have reported the use of rice husk ash (RHA)-based activators instead of traditional activators for geopolymer manufacturing. However, studies related to the use of RHA in its original state remain highly limited. This paper reports experimental results on geopolymer mortars prepared with RHA-based alkaline activator using fly ash (FA) and ground granulated blast furnace slag (GGBS) as precursors. Unlike past studies, the activator was prepared by the addition of RHA to NaOH solution with no pre-processing of RHA. The resulting mortars were tested to comprehend the compressive strength development and microstructure characteristics. The mortars prepared with the synthesized activator attained 28-day compressive strength of 56 MPa. Additionally, mortars made with commercial activator were considered for comparison purposes. In both cases, X-ray diffraction (XRD) results revealed the existence of quartz, albite, and tobermorite as mineral phases in the matrix. The fourier transform infrared spectroscopy (FTIR) results indicated that similar bond formation occurred in both matrices; however, the peak at 609 cm-1 was only seen RHA/NaOH-based matrix due to presence of sulfides in the activator. The field emission scanning electron microscopy (FESEM) results confirmed the presence of geopolymer gels and tobermorite phases in the matrix. Furthermore, thermogravimetric analysis (TGA) provided insights regarding the thermal stability of mortars until 1000 ℃ wherein it was noticed that beyond 700 °C, the mass loss stabilizes at around 9.5%. The outcome of this study underscores the feasibility of RHA/NaOH-based solution in geopolymer applications, thereby contributing to a low-carbon future.