Raw materials for superplasticizers
Raw materials for superplasticizers Superplasticizers are used extensively in larger projects where reinforcing steel requires high workability, for precast concrete and on site where the large water reduction capability provides very early strength concrete with improved durability.
Effects and mechanism of superplasticizers and precursor
There are 2 types of superplasticizers, including naphthalene-based and polycarboxylate-based superplasticizers, and they are in liquid and powder. The recommended dosages in Table 2 are supported by sellers. Table 2. Detailed information about commercial superplasticizers. * supported by sellers. 2.2. Experimental methods 2.2.1.
Superplasticizers
Superplasticizers. Sokalan PA 25 CL PN. Polyacrylic acid, sodium salt, partly neutralized. ... Raw materials for Polyurethane (PU) foam stabilizers. Polyurethane
Superplasticizer - an overview | ScienceDirect Topics
8.2 Chemical structure of superplasticizers Superplasticizers used in concrete come in four main groups: – Sulfated naphthalene formaldehyde (PNS); – Sulfated melamine formaldehyde (PMS); – Vinyl copolymers (VCPs); – Polycarboxylic ethers (PCEs). 8.2.1 Polynaphthalene sulfonates
Suitability of commercial superplasticizers for one-part
Alkali-activated materials are a low-CO 2 alternative for Portland cement in construction. However, one major issue in their use is the poor or varying functionality of the currently available commercial superplasticizers. Especially for one-part (‘just add water’) alkali-activated materials, the number of studies is limited.
- Can superplasticizers be used in alkali activator?
- And zeta potential and ATR-FTIR tests were implemented to reveal the charged properties of raw material particles and the stability of superplasticizers in alkali activator aiming to elucidate the mechanism of superplasticizers in geopolymer pastes and the effectiveness differences between geopolymer and cement-based materials systems.
- How effective are superplasticizers?
- For example, Nematollahi et al. indicated that the effectiveness of superplasticizers depended on the type of binder and activators in addition to the type and dosage of the superplasticizers as well as the pH of the alkaline solution.
- Can OPC control the alkali stability of superplasticizers?
- By setting OPC system as control, the physical and chemical alkali stability of the superplasticizers was characterized using UV-Vis spectroscopy and GPC.
- Do commercial superplasticizers affect the fresh properties of geopolymer?
- The effect of commercial superplasticizers including naphthalene-based and polycarboxylate-based superplasticizers and the effect of the precursor proportions (FA:Slag), i.e., the mass proportion of FA and Slag on the fresh properties of geopolymer has been studied, including flowability, rheological properties and particles packing properties.
- How effective are superplasticizers in a cement system?
- 3.3.1. Fluidity In cement systems, the dosage of superplasticizers typically ranges from 0.3 % to 1.5 % , . In alkali-activated systems, this range is expanded to 0.3–1.8 %. The fluidity results (Fig. 6) indicate that the effectiveness of superplasticizers in a in the two systems were different.
- Do superplasticizers adhere to hydration product crystals?
- Superplasticizers can adhere to certain faces of hydration product crystals and prevent or slow the addition of new growth layers on those faces . Different superplasticizers have different adsorption properties on cement minerals; aluminate minerals have considerably better adsorption properties than silicate minerals .
