You can avoid a situation like that entirely by filling your hollow blocks with gravel or other stones. You may end up with entire sections of a retaining wall that need replacing. As temperatures drop and the collected moisture freezes (and by proxy, expands), the added stress on the concrete will cause it to crack. Rainwater, snow, and ice can all accumulate inside precast retaining walls composed of hollow blocks. Filled Blocks Promote More Efficient Drainage Heavier blocks sit more securely, ensuring the interlocking pattern will remain fixed and tight. Filling each block will provide it with a greater surface area and increased weight. A solid block will have a larger surface area for interlocking with the other blocks surrounding it, whereas a hollow block will lack that surface area, resulting in a less adhesive lock. When you construct precast retaining walls that consist of concrete blocks, you’ll do so by using an interlocking pattern. You can increase the wall’s stability by filling the blocks with some form of infill, such as gravel. When you use precast concrete retaining walls that consist of hollow blocks, however, it’s important to recognize that the wall won’t be durable enough for your needs. In some cases, a block retaining wall may use negative spaces for design purposes, which also counts as a hollow retaining wall. ![]() There are a few advantages to erecting a hollow retaining wall, such as its lower manufacturing cost and greater insulation against sound. The following factors should encourage you to fill those negative spaces with materials like crushed rock or pea gravel: Hollow Precast Retaining Walls Are Less Stable If you have installed a precast concrete retaining wall that is made of hollow blocks, you might consider leaving them that way, but doing so can be a costly mistake that can affect the longevity and durability of the wall.
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