alkali-free
1.Adopting high-strength and high-modulus alkali-free glass fiber，it is knitted into loom。
2.The Product is made of alkali-free glass fiber woven pipe coated with PVC resin through thermoplasticizing.
3.The improvement of the performance of the NSA alkali-free setting accelerator for cement was attempted by the regulation of its chemical composition.
4.The crystallization characters of ZnO-MgO-Al_2O_3-SiO_2 system alkali-free glass have been studied by XRD,SEM,EDXA et al. methods in this paper. Three kinds of crystallization products have been observed.
5.Based on the selection of the accelerating agents for the wet shotcrete, the applicability of the setting time for the accelerating agents got from the tests concerned are discussed herein, from which a proposal is put forward that the alkali-free accelerating agent is suggested to be preferentially applied to the wet shotcrete for the permanent project.
6.Through analyzing the caus-es of quality fluctuation of RFCC deodorized gasoline, measures to improve the quality of RFCC gasoline are presented in respects of optimization of raw material properties and operational parameters and improvement of technological methods. It is believed that combination of Merox extraction tower with fixed bed alkali-free deodor-ization process can enlarge subtractive ratio of mercaptan and enhance gasoline quality to meet quality indexes of gasoline products.
7.The optimum conditions of pulping were as follows; charge of effective alkali 14% (based on Na2O), sulfidity 30%, ratio of weight of oven dry wood material to volume of cooking liquor 1:5, and H-factor 1000. With the elemental-chlorine-containing sequences, ECF (elemental chlorine free) sequences and TCF (total chlorine free) sequences, bleached kraft pulps with high ISO brightness and high physical properties could be produced.
8.Consequently , concrete easily degrades by free-thawing impact , acid corrosion , alkali-aggregate reaction and so on , and carbonation and chloride corrosion in concrete surely cause the rust of rebar , which certainly destroyed the concrete structures .
9.The results have shown that so long as we rigorously control the compositionsof the materials,the technologies of metallurgy and manufacture,and practise theneccessary examination of the sensitivity to the intergranular corrosidn of the aus-tenitic stainless steels,as well as rigorously control the water chemical conditionsof the medium in operating periods,paticularly effectively remove oxygen and pre-vent local concentration of the chloride and presene of the free alkali,it will besatisfactory that these structure materals made in china are used in the PWRpower plant.
