Based on the analysis of drying shrinkage characteristics,the influences of chemical admixtures on the drying shrinkage characteristics were studied in this paper.

The influence of fly ash and chemical admixtures on the working-performance and strength of commodity concrete is studied in this paper.

Meanwhile, such questrons are discussed in the paper as how to make reasonable use of the chemical admixtures, how to give play to its positive function, how to overcome the weakness and then enhance the durability of conerete at the most.

In(5±1) ℃,5% in mass MgSO4 corrosion solution,the visual appearance,strength and composition analysis of cement mortars added with different functional chemical admixtures(shrinkage-reducing agent,hardening accelerator,crystal resistance agent) and limestone powder wereresearched at different storage times.

Starting from the developing trends of the gel materials system, the concrete technique, the chemical admixture, and the high-performance water reducer, etc.

HCC), the differences of the compatibility and control mechanism between chemical admixtures with the cement made by the "973" group and the traditional cement were discussed.

This paper illustrates addition and its functions in concrete,compares addition with concrete chemical additive,discusses the application condition of mineral powder in concrete construction,and shows by practices that addition has obvious effects in reducing cement content,protecting environment,saving resources,and improving various performances of concrete.

Its water resistance can be improved by means of mineral admixture,chemical additive,resinous polymer and pressure shaping and etc.

Concrete chemical additive has been increasingly and widely used in the construction with concrete.

Effects of external magnetic field on spot-welded joint microstructure and performance of 1Cr18Ni9Ti were revealed preliminarily with analysis and study of microstructures of the core of the spot welded joints and the edge of the melt center,the joint's tensile performance and tensile fracture patterns.

The development of microsecond conduction time plasma opening switch (POS) with external magnetic field is outlined in the paper, which is applied to the inductance energy store system in pulse power technology.

Bulk quantity of ultrafine Ni particles was synthesized under stirring condition with or without an external magnetic field in distilled water and ethylene glycol(EG), respectively.

Discussion on the using of concrete additive in hydraulic construction;

Anti-corrosion additive coastal railway bridge in the application;

Influences of admixtures and additives on the durability of concrete;