A new type of amide-modified polycarboxylate superplasticizer was synthesized by a two-step method: Firstly, a mixture of amidated and esterified products reacted by maleic anhydride and 2-aminoethanol was modified through Mannich reaction. Then, the modified product was reacted with Prenyl alcohol polyethenoxy ether (TPEG), acrylic acid and other monomers to obtain an amide-structured polycarboxylate superplasticizer. The molecular weight and molecular weight distribution were measured by Gel permeation chromatography (GPC). Lastly, the optimum AA to modified product ratio, initiator dosage and reaction time were determined by cement mortar test. The concrete application performance showed that the synthesized superplasticizer could improve the fluidity of the concrete and maintain the slump loss as well. The introduction of modified PCE has no harm for the concrete strength.

This study was undertaken to evaluate a new kind of polycarboxylate superplasticizer .Used polyoxyethylene ether (TPEG), acrylic acid (AA) as the monomer, ammonium persulfate (APS) as initiator, thioglycolic acid (TGA) as chain transfer agent, synthesised polycarboxylate superplasticizer with high water reducing rate. The effect of admixtures on fluidity and concrete slump were discussed in this paper. The structure of carboxylic acid water reducing agent was characterized by IR spectra and Gel permeation chromatography.This investigation also evaluated the influence of different serials of polyoxyethylene ether (TPEG), the dosage of acrylic acid (AA) and ammonium persulfate (APS).

The effect of sodium methylacrysulfonate (SMAS) upon the molecular weight, molecular weight distribution and polycarboxylate (PCE)’s dispersion and dispersion-retaining ability were investigated by Gel permeation chromatography (GPC) and test of the fluidity of cement pastes. The results showed that the dosage of SMAS was inversely proportional to the molecular weight of polycarboxylate, and a cubic equation relationship existed between the molecular weight of the polycarboxylate and the reciprocal of SMAS dosage. There was an optimum middle dosage of sodium methylacrysulfonate which could control the molecular weight polycarboxylate, and then affect its dispersion and dispersion maintain performance. The effect of sodium methylacrysulfonate on the monomer conversion rate was also systematically discussed by means of high performance liquid chromatography (HPLC).

The intelligent anti-disoperation operation order system is developed. The system is established on operation management system (OMS). OMS provides the underlying technology support for operation order system. The supports of OMS include basic resources such as graphics, device, topology, the integration of real-time data sources, and the interfaces with external systems and so on. The full process management of operation order as well as operation security checking function based on automation system are realized. The system is composed of the relevant servers of OMS, communication server of local dispatch center, dispatcher workstations and other workstations, user workstations of substation, etc. The system is graphics, intelligent application system for dispatcher and supervisor. It is mainly used to many functions such as intelligent operation order generating, multilayered security checking of operating instructions, operation order management in accordance with procedure, offline operation order generating, operation training, etc.

In order to study the effect of the pH value of reaction system on the properties of polycarboxylate-based superplasticizers (PC) and on the cement workability, the PC are synthesized in different pH environments from 3 to 11 at room temperature. The results show the water-reducing performance of PC can be tuned by controlling the pH value of reaction system at room temperature, which affects not only the efficiency and rate of redox initiator systems but also the reactivity of active monomers.