Final answer:
To construct a foundation on expansive soil, pier-and-beam construction along with lightweight concrete are effective methods. These techniques accommodate soil movement and reduce the load on the foundation.
Step-by-step explanation:
An acceptable method to construct a foundation on expansive soil would involve creating a structure with a proper foundation that can adapt to potential ground movement. One such method is pier-and-beam construction, which consists of vertical piers or columns that support horizontal beams. This type of construction allows the foundation to remain stable as the soil expands and contracts. Utilizing lightweight concrete can also be beneficial in such scenarios. Lightweight concrete reduces the load on the soil and provides thermal protection. It can be made using a mixture of lightweight coarse aggregate with fine aggregates such as shale, clay, or slate. This is important because the reduction of load can help prevent issues that arise due to the swelling nature of expansive soils.