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Their addition allows to decrease the water-to-cement ratio of concrete or mortar without negatively affecting the workability of the mixture. It enables the production of self-consolidating concrete and high-performance concrete. The water–cement ratio is the main factor determining the concrete strength and its durability. Superplasticizers ...
Hydrophobic concrete is concrete that repels water. It meets the standards outlined in the definition of waterproof concrete. Developed in Australia in the mid-20th century, millions of cubic yards of hydrophobic concrete have been laid in Australia, Asia, and Europe, and in the United States since 1999. Its effective use in hundreds of ...
Masonry walls are built with a damp-proof course to prevent rising damp, and the concrete in foundations needs to be damp-proofed or waterproofed with a liquid coating, basement waterproofing membrane (even under the concrete slab floor where polyethylene sheeting is commonly used), or an additive to the concrete. Within the waterproofing ...
Polypropylene fibres are used as a concrete additive to increase strength and reduce cracking and spalling. [49] In some areas susceptible to earthquakes (e.g., California), PP fibers are added with soils to improve the soil's strength and damping when constructing the foundation of structures such as buildings, bridges, etc. [50]
Concrete typically comprises sand, aggregate, water and cement and it is the cement part of the concrete that has the largest single CO 2 emission impact. Approximately 14 billion m 3 of concrete is poured globally each year, [ 7 ] this equates to more than 32 billion tonnes or 1,070 tonnes per second.
As waterproofing liners within tunnels and pipelines; As waterproof facing of earth and rockfill dams; As waterproof facing for roller compacted concrete dams; As waterproof facing for masonry and concrete dams; Within cofferdams for seepage control; As floating reservoirs for seepage control; As floating reservoir covers for preventing pollution
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