This paper briefly describes the cause of poor cement soundness and its hazard,points out the reason why the cement soundness has time effect and puts forward measures and methods to prevent and solve the time effect of cement soundness.
The results showed that it was feasible to use phosphorus slag to produce cement clinker, while with the increasing of the P2O5 content the C3S in clinker would be decomposed, and the P2O5 may form αC2S·C3P with C2S, thus decrease the early strength and cause the bad soundness of clinker.
The shortcomings of Portland cement itself can be resulted by utilizing characteristic of industrial solid waste as while as. Funded by the national 863 project, The key Techniques for Preparation of Low Environment Burthen Type of Cement and Cementitious, high calcium ash (HF) are used to produce series low environment burthen type of 42.5 P.O HF blend cement (HBC) and cementitious with special performance.
Analysis of the thermal expansion anisotropy showed that increased temperature gives rise to equalization of metal-oxygen bond lengths in all oxygen polyhedra at the expense of lengthening of some bonds and virtual invariability of others.
Investigations at the Tien Shan EAS array confirm a change in the properties of showers generated by protons near the upper boundary of the atmosphere and evince the invariability of the energy spectrum of protons in the energy range 103-105 TeV.
This family is characterized by its invariability by a one-parameter group of holomorphic isometries of the complex projective plane.
Here we examine how the energy equations enable us to define the deformation amplitude χm, establish the bond angles expressions and check the energy invariability along the pseudorotation circuit.
The structural invariability of natural diaspores can be concluded from the results.
The relation between soundness and strength of cement and F-CaO pro-hydration has been studied, The results show that F-CaO pro-hydration will cause decrease of cement streength when it improves the soundness of cement,The reaction between a active Al2O3 or SiO2 and Free CaO,which promotes free CaO hydration and forms cementing hydrate at the same time,is considered to be a basic means for improving soundness of cement.
It is described in the paper that the bone coal slag after extraction of Vanadium has a marked effort on griding when used as a cement addition, so as to dramatically increase output and reduce power consumption of the cement mill as well as improving soundness of the cement leaving the mill and shortening the circle of cement production.
The Yong cheng coal gangue burnt at 750 - 850℃ has higher activity. Used as cement admixture it can improve the soundness of cement and reduce the cost. This has brought obviously about economic and social benefits at the place.