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

Table 5

Matrix of the percentage proportion of the proposed soil mixture (S, CHA, and G).

CHA (%)	Gypsum (%)
	0	3	6	9
0	100	97	94	91
5	95	92	89	86
10	90	87	84	81
15	85	82	79	76
20	80	77	74	71
25	75	72	69	66

S = expansive clayey soil, CHA = coffee husk ash, and G = gypsum.