Readings that denote delaying, slowing down the process, or any development. Retarders in mixtures control the setting process of concrete. Mixtures that prolong the hydration induction period, thus lengthening setting times, are known as retardants. However, they work in different ways. Materials in this category generally act by reducing the solubility of the wetting components in cement and are therefore solubility reducers; for example, plaster delays the dissolution of the aluminate, thus delaying the setting of the cement. Alternatively, the mixtures react with a component to form a precipitate on the cement particles, imparting a low-permeability coating to the grains and thereby slowing further hydration.
We are more interested in the second category of “coating” additives. The cement element produces a large number of calcium ions when they have water in the surrounding environment and any substances. Therefore, the more hydratable components of concrete are valuable in facing mixes.
Rheology deals with the flow of concrete materials. The invention provides a rheology modifier for concrete and a method of preparing it. The rheology modifier can be synthesized by a simple method, has good compatibility with other additives, has excellent resistance to salt and alkali, can effectively improve the workability of new mixed concrete, prevent separation, water segregation, and concrete failure, has good suspension coating effects, prevents severely delayed coagulation or creep phenomenon, has little influence on the retention value of concrete flow rate, effectively solves the contradiction of flowability and separation resistance of new mixed concrete, it is insensitive to a quantity of dopant and has the optimum utilization ratio of modifying rheology with concrete. Apart from these mixtures, the SNF is very effective in the construction process.
SNF is a highly effective water reducing agent to promote accelerated development of initial and final strength in concrete and mortar, commonly known as superplasticizer, also called Naphthalene Sulfonate Formaldehyde Condensate (NSF), PNS and FDN, etc…
▪ SNF has good adaptability to various cement and does not erode to reinforcing bars, it is not poisonous and does not pollute.
▪ SNF has been applied to highway, bridge, tunnel, hydroelectric water protection project, port, pier, skyscraper, energy engineering, industrial and civil construction, the prestressing force component and high-end concrete, etc.
Calcium lignosulfonate water reduction in reinforced concrete paper. … Therefore, in concrete mixed with superplasticizer lignin, concrete mixing can reduce water consumption and reduce the water-cement ratio, improve workability, promote pumping, improve concrete strength, density and durability As discussed in the Substance Composition section, other lignin sulfonate salts exist (U.S. EPA, 2010b) and are included on OMRI’s Generic Materials List (OMRI, 2013), but little specific information is available about them.
Calcium naphthalene sulfonate
Naphthalene calcium sulfonate raw material designed for high water reduction in concrete admixture formulations as raw material. The product is used in the following conditions and applications. Pre-mixed concretes that require high performance of workability and maintenance of workability.