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<p>Salty soils, primarily cemented by salts, exhibit low shear strength and high compressibility. Sustainable improvement of this soil is pursued through deep soil mixing (DSM) methods using waste marble powder (WMP) and cement as alternatives to traditional piling work. This study developed a laboratory-scale DSM apparatus for soil remediation, employing a binder composed of WMP and cement followed by a field mix trial. The study aimed to quantify the total water content, incorporating both the initial soil moisture and the water/binder ratio, as well as the WMP ratio for substituting cement to achieve an effective eco-friendly binder mix design. Unconfined compressive strength (UCS) tests at short- and long-term conditions including durability assessment were carried out. Samples density and ultrasonic velocity were measured. Moreover, microstructural analyses were performed to assess the treatment efficacy. Subsequently, a comparison between laboratory and field-mixed sample strength was performed. The results of laboratory and field tests demonstrated that the efficient and eco-friendly binder mix comprises 20 to 30% WMP and 80 to 70% cement with a total water content of 40 to 45% (w/b ratio 1.1 to 1.3). Field samples exhibited higher UCS values than the laboratory samples by 78%.</p>

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Waste Marble Powder for Salty Soil Treatment: Deep Mixing Experimental Study

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Mohammed A. Hammad,
  • Yahia Mohamedzein,
  • Mohammed Al-Aghbari

摘要

Salty soils, primarily cemented by salts, exhibit low shear strength and high compressibility. Sustainable improvement of this soil is pursued through deep soil mixing (DSM) methods using waste marble powder (WMP) and cement as alternatives to traditional piling work. This study developed a laboratory-scale DSM apparatus for soil remediation, employing a binder composed of WMP and cement followed by a field mix trial. The study aimed to quantify the total water content, incorporating both the initial soil moisture and the water/binder ratio, as well as the WMP ratio for substituting cement to achieve an effective eco-friendly binder mix design. Unconfined compressive strength (UCS) tests at short- and long-term conditions including durability assessment were carried out. Samples density and ultrasonic velocity were measured. Moreover, microstructural analyses were performed to assess the treatment efficacy. Subsequently, a comparison between laboratory and field-mixed sample strength was performed. The results of laboratory and field tests demonstrated that the efficient and eco-friendly binder mix comprises 20 to 30% WMP and 80 to 70% cement with a total water content of 40 to 45% (w/b ratio 1.1 to 1.3). Field samples exhibited higher UCS values than the laboratory samples by 78%.