Waterproofing Admixture; a Porous Material Used as Construction Material to Reduce Water Permeability

 

Waterproofing admixtures

Waterproofing admixtures are porous materials that have the ability to absorb water and water-borne contaminants. Waterproofing admixtures reduces the permeability of concrete making it waterproof. Admixture contain hydrophobic chemicals or water-repellent derived from soap, fatty acids, vegetable oils, and petroleum. When mixed with concrete, these materials form a water-repellent layer with pores in the concrete, and help increase water resistance. Thus, there is an increasing demand for waterproofing admixtures.

This is attributed to the increasing construction activities and also from maintenance and repair activities. Therefore, the use of Waterproofing Admixtures has increased or increasing around the world. For example, according to the German Government report on damages in building structures, over 80% of damages ultimately relate to waterproofing issues. Moreover, BASF’s new admixture, MasterRheosure, sets a new benchmark for everyday concrete in Japan.

BASF's air-entraining water-reducing agent, MasterRheosure, provides superior rheology and slump retention for everyday concrete, helping concrete producers master longer delivery times even under challenging conditions. There are five distinct classes of chemical admixtures, such as water-reducing, air-entraining, retarding, plasticizers, and accelerating. Admixtures can be added to concrete to achieve/modify its properties. In addition to cement, water, and aggregate, admixtures can be added immediately before or during the mixing process.

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Compared to traditional waterproofing systems, waterproofing mixes offer various advantages, such as easy use in powdered/crystalline form, easy handling/transportation, and comparatively cheap. Moreover, waterproofing admixtures have various applications, such as underground vaults, swimming pools, parking structures, tunnel and subway systems, precast components, water reservoirs, sewage and water treatment plants, water tanks, foundations, and secondary containment structures, among others.

In short, waterproofing admixture is used as a building material to reduce water permeability in different ways, which include reduction in the size of capillary pores, their numbers, and continuity inside the concrete structure or by blocking the capillary pores of the concrete, or it may line the capillary pores with hydrophobic materials.

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