Fuente: WIPO "tomato" An epoxy grout composition for under-grouting applications includes an epoxy resin and a hardener in a ratio of about one part hardener to about five parts epoxy resin. The grout composition further includes a first filler consisting of a silica sand having a density in a range of about 2000 kg/m3 to about 2300 kg/m3, and a second filler comprising about 2 wt % to about 10 wt % of date palm waste material having a density in a range of 85 kg/m3 to 890 kg/m3. The date palm waste material includes date palm midrib or date palm midrib fibers. The incorporation of date palm waste in a weight fraction of 2% or 5% in the grout compositions results in a significant increase in the compressive and flexural strengths of the epoxy grout compositions.