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<p>Alkaline-activated mortar is a low-carbon and environmentally friendly cementitious material, characterized by high strength and resistance to acid and alkali corrosion. In this study, alkaline-activated mortar was used to investigate the changes in the strength of soft clay, considering different wollastonite contents and varying percentages of 10&#xa0;M potassium hydroxide solution, with samples cured for 7, 14, 28, and 90 days. Then, the samples were subjected to uniaxial compressive strength and tensile strength tests, X-ray diffraction (XRD), electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis. The results show that with the increase of wollastonite up to 3%, the compressive and tensile strength increases at first and then decreases, and with the increase in the percentage of alkaline solution and curing time, the compressive and tensile strength of the samples increases. The highest compressive strength and tensile strength were obtained after 90 days of curing with 3% wollastonite and 16% potassium hydroxide, reaching values of 2947.1 and 318.7&#xa0;kPa, respectively, which represent increases of 1.69 and 1.77 times compared to the sample activated with 4% alkaline activator. The results of microstructural analyses on samples indicated the dissolution of wollastonite and clay in the presence of alkaline solution along with the formation of calcium silicate hydrate(C-S-H) gel and hydrated calcium aluminosilicate(C-A-S-H). Also the strength of the samples increases with the curing time and geopolymerization of the dissolved ions.</p>

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The Effect of Alkaline Activated Wollastonite on the Mechanical Properties of Clay (A Case Study in Southern Tehran)

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Nastaran Khorram,
  • Ali M. Rajabi

摘要

Alkaline-activated mortar is a low-carbon and environmentally friendly cementitious material, characterized by high strength and resistance to acid and alkali corrosion. In this study, alkaline-activated mortar was used to investigate the changes in the strength of soft clay, considering different wollastonite contents and varying percentages of 10 M potassium hydroxide solution, with samples cured for 7, 14, 28, and 90 days. Then, the samples were subjected to uniaxial compressive strength and tensile strength tests, X-ray diffraction (XRD), electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis. The results show that with the increase of wollastonite up to 3%, the compressive and tensile strength increases at first and then decreases, and with the increase in the percentage of alkaline solution and curing time, the compressive and tensile strength of the samples increases. The highest compressive strength and tensile strength were obtained after 90 days of curing with 3% wollastonite and 16% potassium hydroxide, reaching values of 2947.1 and 318.7 kPa, respectively, which represent increases of 1.69 and 1.77 times compared to the sample activated with 4% alkaline activator. The results of microstructural analyses on samples indicated the dissolution of wollastonite and clay in the presence of alkaline solution along with the formation of calcium silicate hydrate(C-S-H) gel and hydrated calcium aluminosilicate(C-A-S-H). Also the strength of the samples increases with the curing time and geopolymerization of the dissolved ions.