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How MHEC For Plaster Mortar Reduces Mortar Hollow Drumming
Jun 04,2026
Mortar "hollow drumming"—characterized by a hollow sound when a wall surface is tapped—is one of the most common quality issues encountered in plastering projects. In severe cases, it can lead to the detachment or cracking of the surface layer, thereby compromising both the durability and aesthetic appeal of the overall structure. The root causes of this phenomenon are often closely linked to insufficient mortar adhesion, inadequate wetting of the substrate, and excessive moisture loss during the construction process. The application of MHEC (Methyl Hydroxyethyl Cellulose) for Plaster Mortar offers an effective material-based solution for mitigating this problem.
During the bonding process between the mortar and the substrate, interfacial wettability is a critical factor determining the quality of adhesion. MHEC for Plaster Mortar enhances the mortar's water-retention capacity, preventing moisture from being rapidly absorbed by the substrate during application and thereby ensuring sufficient contact time between the mortar and the wall surface. A more stable interfacial hydration reaction facilitates the formation of a dense transition layer, resulting in a stronger bond between the mortar and the substrate and effectively reducing the risk of hollow drumming caused by poor adhesion.
The volumetric stability of the mortar following application also plays a significant role in the occurrence of hollow drumming. Traditional mortars are prone to generating shrinkage stress when moisture is lost too rapidly, which can subsequently lead to the formation of microscopic voids at the interface or within the mortar matrix. By regulating the rate at which moisture is released within the system, MHEC ensures a more uniform and steady hydration process. This reduces early-stage drying shrinkage stress and minimizes the formation of internal voids at the source, thereby guaranteeing the overall compactness and structural integrity of the finished work.
Workability—the ease with which the material can be handled during construction—is another critical factor influencing the likelihood of hollow drumming. MHEC improves the mortar's lubricity and workability, making it easier to spread uniformly during troweling and compaction. This enables workers to more effectively expel trapped air during the finishing process, thereby reducing localized voids caused by insufficient compaction and enhancing the overall density of the applied mortar.
In applications involving thick-layer plastering or highly absorbent substrates, mortar faces a heightened risk of delamination due to uneven moisture loss. By enhancing the overall stability of the system, MHEC for Plaster Mortar ensures that the mortar maintains excellent sag resistance and structural integrity during vertical application. This effectively prevents adhesion failures that might otherwise result from sliding or stratification of the mortar layers.
MHEC for plaster mortar collectively reduces the probability of mortar hollowing—a phenomenon known as "drumming"—by exerting multiple effects, including enhanced water retention, improved interfacial wetting, optimized rheological properties during application, and increased volumetric stability; this renders plastering projects more reliable in terms of both quality control and durability.
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