Abstract
There have been many experimental measurements of the waterproofing ability and durability of concrete with a crystalline admixture, but some other important properties have not been reliably tested yet. The results of the tests, carried out by the authors, showed that crystalline admixtures reduce the water vapor permeability of concrete by 16-20 %. The authors also carried out the water pressure test in different time intervals, during the initial phase of cement hydration. The test results have shown that the full waterproofing effect of concrete with a crystalline admixture is available approximately on the 12th day after the concrete creation. The crystalline admixture effect on the compressive strength of concrete was also the subject of the testing. The results have shown that the compressive strength of the concrete with a crystalline admixture (added in an amount of 2 %) and the compressive strength of the specimens from concrete without admixture were almost identical after 28 days.
Highlights
The protection of buildings against subsurface water and moisture is a significant part of the building design
The results of experimental measurements have shown that the crystalline admixture reduces the water vapor permeability of concrete by 16 % (Xypex) 20 % (Penetron)
The results have shown that the compressive strength of the concrete with a crystalline admixture and the compressive strength of the specimens from concrete without admixture were almost identical after 28 days
Summary
The protection of buildings against subsurface water and moisture is a significant part of the building design. Crystalline materials are often used to protect the underground parts of a building against moisture and subsurface water. There are several methods of the application of crystalline materials into the concrete structure: surface-applied coating or spraying, repairing and sealing mortars and integral waterproofing admixtures. The waterproofing admixture is designed for newly constructed buildings with the foundation structure from waterproof concrete. The crystalline material’s waterproofing effect in concrete is achieved by the reaction of various chemical components, which are contained in the solution, when combined within the concrete matrix [1]. In the case of a shortage of moisture inside the concrete structure, the crystalline admixture’s components lie dormant
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