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In poured concrete foundations, cracks and pipe penetrations are the most common entry points for seepage. These openings can be sealed from the interior. Epoxies , which are strong adhesives, or urethanes can be pressure injected into the openings, thus penetrating the foundation through to the exterior and cutting off the path of the seepage.
The curing of concrete when it continues to harden after its initial setting and progressively develops its mechanical strength is a critical phase to avoid unwanted cracks in concrete. Depending on the temperature (summer or winter conditions) and thus on the cement hydration kinetics controlling the setting and hardening rate of concrete ...
Concrete is a brittle material and can only withstand small amount of tensile strain due to stress before cracking. When a reinforced concrete member is put in tension, after cracking, the member elongates by widening of cracks and by formation of new cracks. Figure 1 Formation of internal cracks
On June 30, WLS-TV in Chicago publicized a bystander's video of water pouring into the parking garage from above near its entrance, and apparent concrete rubble lying on the floor, reportedly taken at 1:18 a.m., seven minutes before the north-central portion of the building collapsed. [189] [190] Remains of the collapsed condominium in October 2021
Typical crack pattern of the alkali-silica reaction (ASR). The gel exudations through the concrete cracks have a characteristic yellow color and a high pH. The fatty aspect of the exudations imbibing the concrete porosity along the cracks is also a distinctive feature of ASR. The alkali-silica reaction as a chemical cycle process
The units were moved over column 5E, where the most visible cracks in the fifth floor were seen before the collapse. The cracks worsened because the columns supporting the fifth floor were not aligned with the ones supporting lower floors, thus causing the load of the fifth floor to be transferred through the slab. [3]
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