Effectiveness of Thermal Stimulation of Superplasticizers on
Polycarboxylic acid-based superplasticizers are used in various types of concrete work. Wide variations in environmental temperatures are known to affect how well chemical admixtures perform as superplasticizers, influencing the properties of the concrete. However, little has been reported on changes in performance caused by thermal variations. Previous studies have reported that heating
Synthesis of polycarboxylic ether superplasticizers based on
The existed polycarboxylic ether superplasticizer (PCEs) that mainly synthesized in a homogeneous catalytic synthesis has the disadvantages of low conversion rate and poor performance stability. In this paper, high performance PCE-1–5 were synthesized via a heterogeneous H 2 O 2 -ASA (ascorbic acid) redox system catalyzed with MnO 2 , Fe 2 O
Study on the synthesis and properties of benzoate modified
The copolymers grafted with benzoate exhibited a high dispersion performance than that of the unmodified molecule, which could be explained as the hydrophobic modified polycarboxylate superplasticizer mainly dispersing cement particles by the main repulsion of steric hindrance and electrostatic repulsion, so as to improve the dispersion
Synthesis and Performance of Polycarboxylic Acid
A new type of polycarboxylic acid superplasticizer (G18-PCEs) containing crosslinked linkage was synthesized by the method of the first esterification and then polymerization. Its monomer and polymer structure were confirmed by 1H nuclear magnetic resonance (NMR) spectroscopy and High-performance liquid chromatography.
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.
- What is polycarboxylate superplasticizer?
- 1. Introduction The polycarboxylate superplasticizer is characterized by low dosage requirements, a high water-reducing rate, excellent slump retention performance, and strong designability and environmental friendliness during the production process, making them the most widely used admixture in modern concrete , , .
- What is mikem polycarboxylate superplasticizer?
- MIKEM polycarboxylate superplasticizer is a powdered polycarboxylic acid water-reducing agent manufactured by optimizing molecular group configuration and synthesis process. It has a variety of advantages, including fast plasticization speed, excellent plasticizing effect, easy-defoaming, and good strengthening performance.
- Does polycarboxylic superplasticizer affect dispersion and water retention?
- The molecular-scale structural changes in polycarboxylic superplasticizer (PCE) can influence dispersion and water retention. Polycarboxylate superplasticizer, synthesized using different methods, may alter dispersion and water-reducing effects.
- Which chain transfer agent is used in polycarboxylate superplasticizer?
- The selected chain transfer agent is 3-mercaptopropionic acid. Under conditions where the acid-ether ratio is 4.0:1, the reflection temperature is 35°C, the sulfonic acid content is 16.0%, and the initiator dosage is 1.0%, with all other reaction conditions held constant, polycarboxylate superplasticizer were synthesized.
- What factors affect the effectiveness of anti-Clay polycarboxylate superplasticizer?
- In the fractional factorial design, the significance of five factors affecting the anti-clay polycarboxylate superplasticizer's effectiveness are investigated: acid-to-ether molar ratio (n (AA): n (GPEG)), reaction temperature, sulfonic acid dosage, initiator dosage, and chain transfer agent dosage.
- What is polycarboxylic acid used for?
- and prestressed concrete.The polycarboxylic acid series high-performance water-reducing agent is suitable for high-strength concrete, self-compacting concrete, pumped concrete, fair-faced concrete, precast concre
