Low-cost synthesis of high-performance polycarboxylic ether
As a new type of high-performance water-reducing agent, polycarboxylate ether (PCE) has excellent properties such as small dosage and high water reduction rate. However, it is still necessary to develop a synthetic process to improve the performance of PCE at a low cost. In this paper, Co2+-, Ni2+- or Zn2+-catalyzed H2O2-NaHSO3 redox initiation system is designed as a new cost-effective
High-performance superplasticizer based on chitosan
A water-reducing agent is an important and indispensable ingredient of modern concrete. It helps to produce fresh concrete that has a high fluidity and low water-to-cement (w/c) ratio; in addition, it can notably increase the mechanical strength of hardened concrete at a lower cost ( Plank et al., 2008, Petit et al., 2010 ).
Water-Reducing Admixture - an overview | ScienceDirect Topics
Water-reducing admixtures, plasticizers, high-range water reducers and superplasticizers Water-reducing admixturesare recommended both for avoiding excessive cement content for a given free water/cement ratio at the required consistence class and to reduce any tendency towards excessive bleeding by minimizing the free water content.
Polycarboxylic Acid Water-Reducing Agent - IRO Group Inc.
The polycarboxylic acid water-reducing agent is suitable for pumping or normal concrete engineering of C15~C60, particularly for engineering with high durability, fluidity, strong slump retention ability, and aesthetic appearance. In addition, this product is a good choice for high fluidity, self-compacting, and as-cast finish concrete.
Polycarboxylate Superplasticizer Powder & Liquid for Concrete
PCE based superplasticizer (High Water Reduction) is the light yellow liquid, it can greatly reduce the water consumption of cement, increase the fluidity of concrete, and improve the crack resistance of cured cement. It can be widely used in non-shrinkage grouting, repair mortar, etc.
- Why are polycarboxylate superplasticizers important in concrete admixtures?
- 1. Introduction In modern construction industry, polycarboxylate superplasticizers (PCEs) have become one of the indispensable components in concrete admixtures because they can obviously improve the performance of various types of concrete in a low water to cement ratio (w/c) and lower dosage , .
- How to adjust the dispersibility and plasticity of water reducing agent?
- Molecular controllability,The dispersibility and Plasticity of the water reducing agent can be adjusted by adjusting the molecular weight of the main chain of the molecule, the length of the side chain, the density of the side chain and the type of the side chain group.
- How do superplasticizers adsorb to ettringite?
- Thus, the superplasticizers molecules can directly adsorb to positively charged phases such as C 3 A and ettringite (Aft) by the electrostatic attraction and indirectly adsorb to negatively charged phases such as C 3 S, C S H and portlandite (CH) through bridging with Ca 2+ in the pore solution .
- Why do polyether side chains affect adsorption of superplasticizers?
- It is due to the increase of the polyether side chains reducing the density of the carboxyl groups in the superplasticizer molecules, thereby reducing the electrostatic attraction of the superplasticizers to the cement particles while increasing the steric hindrance and thus hindering adsorption.
