Resultado de búsqueda
Small pieces of PCC that break loose from the surface leaving small divots or pock marks. Popouts range from 25 – 100 mm (1 – 4 inches) in diameter and from 25 – 50 mm (1 – 2 inches) deep. Figure 1: Large popouts. Figure 2: Popout close-up.
15 de ene. de 2013 · Popouts occur when small portions of the surface mortar break away from the concrete flatwork. This leaves shallow and cone-shaped holes with broken, or as in your case, deteriorating material at the bottom of the holes. Popouts are categorized as small, medium, and large.
Popoffs can be a result of a poor quality concrete mixture, improper finishing, or inadequate curing practices that result in a poor bond between mortar and coarse aggregate particles. Popoffs are typically caused by pressure buildup associated with freezing of moisture in the mortar above the aggregate.
A “popout” is a small, generally cone-shaped cavity in a horizontal concrete surface left after a near-surface aggregate particle has expanded and fractured. Gen-erally, part of the fractured aggregate particle will be found at the bottom of the cavity with the other part of the aggregate still adhering to the point of the popout cone.
grained limestones are the commonly observed causes of popouts. Most popouts occur within the first year of concrete placement. Moisture induced swelling may occur shortly after placement due to moisture absorption from the plastic concrete, or they may not occur until after prolonged rainy weather or the first winter.
3 de abr. de 2024 · Concrete popouts are small, often cone-shaped craters that form on the surface of concrete slabs. Popouts can either occur during the concrete curing process or after a period of extreme snow and ice. The holes occur when aggregate breaks away from the mortar, leaving gaps up to an inch wide.
Alkalis from cement or other source cause an environment of high pH (high concentrations of hydroxyl ions) causing the breakdown of silica and formation of an ASR gel. The gel absorbs water and expands, removing a small portion of the surface mortar with it. These are referred to as ASR popouts.
