Shear Strength Improvement of Clay Soil Stabilized by Coffee Husk Ash

Abstract

Finding alternatives to natural resources is important for a sustainable future and is essential to infrastructure projects. Among these replacements is the use of coffee waste as soil stabilizers. Coffee husk ash (CHA) is a solid waste obtained by the processing of coffee beans on a farm or factory. The main aim of this study is to determine the geotechnical properties of clay soil treated with CHA to develop a low-cost, environmentally friendly alternative composition. Laboratory tests were conducted to investigate the influence of CHA on the physical properties and the mechanical properties of clay. The CHA concentration was adjusted from 5% to 25% by the dry weight of clay in 5% increments. The clay classification of the mixture becomes coarser following the addition of the CHA. At 25% CHA, a peak UCS of 130.83 kN/m2 was measured compared with the untreated clay of 89.17 kN/m2. In addition, the cohesion values and internal friction angles of soil for 0% and 25% CHA increased from 80.1 kN/m2 to 148.7 kN/m2 and from 16.1° to 25.8°, respectively. It was found that CHA can improve the strength of clay by forming a pozzolanic and hydration process that fills soil voids and binds particles together.

Utilization of Coffee Husk Ash on the Geotechnical Properties of Gypsum-Stabilized Expansive Clayey Soil

“…The soil water solubility appears to have been lowered by the CHA addition, causing the OMC to fall [50]. According to the previous researchers' reports [21], there is an increase in MDD and a decrease in OMC when CHA is added.…”

“…Numerous investigations have been done on the effectiveness of clay stabilization by CHA admixing. In this context, Munirwan et al [21] conducted research on the shear strength improvement of clay soil stabilized by coffee husk ash (CHA). They evaluated the geotechnical properties of clay soil treated with CHA to minimize the construction cost and develop environmentally friendly alternative compositions.…”

Cymbopogon nardus Leaf Ash as an Alternative Material for Enhancing Concrete Strength

“…cockle shells [14], blood cockle shells [15], periwinkle shells [16], snail shells [17], green mussel shells [18], eggshells [19], fly ash [20], and rice husk ash [21,22] have been extensively used as cement replacements in concrete. Utilizing waste materials as partial substitutes for cement may lower the construction production costs [23][24][25].…”

Use of coffee husks – comparison of pellet bedding quality, performance features, and some welfare indicators of broiler chickens

“…Roasted coffee is produced from coffee beans, a product destined for the consumer market [ 1 ]. The largest coffee exporters are Brazil, Colombia, Vietnam, and Indonesia [ 2 ]. Poland is one of the leaders (10 th ) among coffee market customers, and the import of coffee grains amounted to 160 thousand tons [ 3 ].…”

“…By-products (coffee husks (CHs) and pulp) are produced in coffee roasters, and combustion may pollute the environment [ 4 , 5 ]. CHs are the subject of research on the possibility of their use as fuel, alternative energy, material for producing biodiesel, biogas, biomass briquette, and even fermentable sugars and fertilizer [ 2 , 6 – 9 ]. Using CHs as bedding material can be a solution to manage waste and counteract environmental pollution [ 10 ].…”