Getting through test and study, mixed with J2 type activator, using the blast furnace slag from Jinan steel plant to produce super high strength high sulfate resisting high performance slag cement. Standard mortar strength by 3d 52. 5MPa, 28d 75. 20MPa.
It is shown in the laboratory results that adding in admixture N (or M)can raise the strength of steel slag and mineral slag cement dramatically with the 3 d compression strength increased to 5.0 MPa and 28 d compression strength increased to 7.0 Mpa. Otherwise anhydrite and burnt gypsum is better than dihydrate gypsum in the aspect of improving hydration and hardening of cement.
The strength of Portland Cement containing C_4A_3 added with admixtures was high. , especially the strength of fly-ash cement containing C_4A_3 was higher than that of slag cement containing C_4A_3. However, this phenomenon is reversed to the traditional verdict "The activity of slag is higher than that of fly-ash in cement system".
The hydration heat evolution rates and the strength developments of two kinds of alkali-phosphorus slag cement (sample Mo activated by NaOH and Ml activated by Na_2 O.SiO_2) at different temperature were studied.
By using the basic theory of mixed activation of sodium and cacium alkalines and sulphate as well as the mechanism of super high early strength cement,a kind of high phosphorous slag cement (HPSC) has been produced by means of complex admixtures with low cost.
A comparison between the model predictions and the experimental results in literature shows that the presented computer model can successfully predict the hydration process and the microstructure development of hydrating slag cement paste.
A newly developed version of a three-dimensional computer model for simulating the hydration and microstructure development of slag cement pastes is presented in this study.
Three-dimensional computer modeling of slag cement hydration
The model predictions are further used to calculate some properties of hydrating slag cement pastes, including the molar fractions of products, the water retention, chemical shrinkage and porosities of pastes.
Fiber-reinforced cement composites were produced in Brazil using blast furnace slag cement reinforced with pulped fibers of sisal originated from agricultural by-products.