**3.4 Compressive strength**

Mirza et al. [14] performed tests as per ASTM C109, which announced that 150°C warmed 20% bentonite-concrete blends accomplish great compressive strength at 7 years old and 28-days remaining blends shown lower than control concrete mortar, displayed in **Figure 3** [9]. Ahmad et al. [16] led probes bentonite blends at room temperature and 500°C; all blends have shown lower compressive strength than the control blend. The concrete mortar containing 20% bentonite shows more compressive strength than control concrete mortar [24]. 30% bentonite-concrete blends show

**Figure 2.** *Strength activity Indices of different bentonite mixes [14].*

#### **Figure 3.**

*Compressive strength of different bentonite mixes [14].*

higher protection from MgSO4 and Na2SO4 [11]. Reddy et al. [25] revealed that 20% bentonite-concrete blend showed ideal compressive strength following 3, 7, and 28 days relieving among all mixes [25]. Bentonite adjusted concrete mortar shows lower compressive strength than control concrete mortar in adjustment sewage slime [26]. Better compressive strength was shown by bentonite adjusted concrete mortar in the redesign of adobe structures over metakaolin [27].
