Interaction between polycarboxylate superplasticizers and non-calcined
1. Introduction. Polycarboxylate ether/ester (PCE) polymers – probably the most important invention in concrete technology of the last decades – provide superior water-reducing ability, excellent workability improvement and lower dosage requirements as compared to former generations of superplasticizers such as polynaphthalene sulfonate (PNS), polymelamine sulfonate (PMS) and acetone
Dispersing performance of different kinds of
As superplasticizers, a series of MPEG, IPEG and HPEG PCEs possessing different side chain lengths was employed. All PCE samples except for the HPEG PCEs which were commercial products were self-synthesized via free radical co-polymerization.
40 years of PCE superplasticizers - ScienceDirect
The steric repulsive potential is expressed by the Ottewill-Walker equation [56] as follows: (2) V steric a = 4 π k T C v 2 3 v 1 2 ρ 2 2 ψ 1 κ 1 δ a 2 3 R + 2 δ + a 2 where C v is the concentration of material in the adsorbed layer; v 1 is the molecular volume of solvent molecules; p 2 is the density of the adsorbate; ψ 1 and κ 1 are the entropy and enthalpy parameters
Synthesis of the VPEG Polycarboxylate Superplasticizer with
Zeng,J.(2015)VPEG Synthesis of VPEG Type PolycaI．boxylate Superplasticizer.Guangzhou Chemical, 43:105-107. Synthesis and properties of polycarboxylate superplasticizer for improving workability
HPEG, TPEG - LinkedIn
No matter HPEG, TPEG or VPEG, MPEG, SPEG, all these are materials for the 3rd generation concrete polycarboxylate superplasticizer. HPEG, VPEG is characterized with high water reducing...
- Which is better hpeg PCE or hpeg based PCE?
- Moreover, it was found that the HPEG-based precast kind presents the most effective superplasticizer also in neat CC (dosage value 0.13% bwob vs. 0.18% bwob for 45MPEG6 and 0.20% bwob for 50IPEG6). This further underlines the overall superiority of HPEG PCEs among the PCE products. 3.2.4. Summary of PCE performances
- Is MPEG PCE a good superplasticizer?
- Also, MPEG PCEs possessing shorter side chains and low acid content were found to be quite effective superplasticizers. Generally, PCE dosages increased with ascending content of calcined clay to satisfy its higher water demand and its more pronounced uptake of PCE as compared to OPC.
- What are hpeg PCE products?
- HPEG PCEs Two commercial standard HPEG PCE products were studied. They are distinguished by their anionicity, a highly anionic PCE mostly applied in precast concrete and the other a less anionic, hydrolysable slump-retainer kind which is predominantly used in the ready-mix concrete industry.
- Which mpeg PCE is best?
- While MPEG PCEs exhibiting medium long side chains (nEO = 23) and low anionicity are most effective, in OPC and at low clinker substitution rates (up to 20% replacement) MPEG PCEs of longer side chain (45 EO units) and higher anionic character (molar ratio 6:1) work better in blended cements of >20% cement substitution. 3.2.2. IPEG PCEs
- How effective are MPEG PCEs?
- Thus, optimal effectiveness can be achieved from MPEG PCEs possessing shorter (nEO = 23) or longer side chains (nEO = 45), however in both cases the anionicity of the molecules needs to be modulated.
- What are the advantages of TPEG / hpeg?
- 1.TPEG/ HPEG have good solubility in water. 2.TPEG/ HPEG adopts high active catalyst and special synthesis process, characterized by narrow molecular weight distribution, low polyethylene glycol content and high retention rate of double bonds. It obviously increases the reactivity of polymerization and raises the product yield.
