Study on performance stability of Polycarboxylate
The effects of initial dropping temperature, amount of ferrous sulfate and dropping time on the performance of Polycarboxylate Superplasticizer were studied, and the measures to maintain the...
Progresses in Synthesis of Polycarboxylate Superplasticizer
It was shown in Fourier transform infrared spectroscopy (FITR) that the molecular structure of modified polycarboxylate superplasticizer (MPCE) contained sulfonic acid groups, carboxylic acid groups, polyethylene oxide vinyl groups, and other groups and had comb-shaped molecular structure.
Synthesis and Properties of a Polycarboxylate
Polycarboxylate superplasticizers (PCEs) emerged as one of the most important superplasticizers for concrete due to their superior performance. (1,2) Compared to other products like polycondensates, they fluidize cement even at low water to cement ratios, require relatively low dosages, and exhibit a long slump retention capability. (35) The
Effect of superplasticizers on the rheological properties
This paper explores the influence of superplasticizer dosage, superplasticizer family and mineral admixture dosage on the rheological behavior of cement paste. For this purpose cement pastes were prepared at a water cement ratio of 0.37 using OPC and different percentage of fly ash (15, 25, 35) and different dosages of superplasticizer (one
Preparation and properties of polycarboxylate
In this paper, ethyl glucose (Glc), 2-amino-4-methyl-5-phospho-3-pentenoate (AMEPA) and p-toluene sulfonic acid (PTS) were esterified, and the esterified products were polymerized with acrylic acid...
- Do Polycarboxylate ether/ester superplasticizers affect concrete performance?
- Polycarboxylate ether/ester (PCE) superplasticizers are widely used due to their molecular structural designability, low dosage and high efficiency. However, their high sensitivity and strong interactions with clays in concrete reduce their dispersion and water-reduction capability, which can affect the performance of concrete seriously.
- What is polycarboxylate superplasticizer (PCE)?
- As one important auxiliary, superplasticizers have attracted lots of attention in the concrete and building materials field. Specially, polycarboxylate superplasticizer (PCE) has been widely applied due to its relatively low doping amount, high water reducing rate and environmental friendliness property.
- What are the advantages of PCE compared to lignosulfonate based naphthalene based superplastic?
- Compared with the lignosulfonate and sulfonated naphthalene formaldehyde based superplasticizers, PCE was endowed with several special advantages including: 1) lower doping amount for higher water reducing rate ; 2) effectively keeping the slump of concrete without prolonging its setting time , .
- Do sacrificial agents and molecular design affect clays-resistance of PCEs?
- The effects of use of sacrificial agents and molecular design on clays-resistance of PCEs are analyzed. Polycarboxylate ether/ester (PCE) superplasticizers are widely used due to their molecular structural designability, low dosage and high efficiency.
- Why do polycarboxylate polymers have low anion charge density?
- As shown in Fig. 2, Plank et al. reported that in the pore solution of cement, the main chain of polycarboxylate polymer will be wrapped by cation cloud formed by counter-ion condensation, thus exhibiting low anion charge density and reducing their adsorption and dispersion capacity.
- Why are linear polycarboxylic copolymers better than comb-PCE?
- Compared with comb-PCE, linear polycarboxylic copolymers with low molar masses are easier to be adsorbed by clays owing to their high degree of diffusion freedom, and are also good dispersants for decrease in viscosity .
