Study On The Effect Of GGBS And HP-CSA On The Performance Of The Artificial Seasand-Seawater Concrete

With the growth of China's economy,the vigorous development of the construction industry has led to a significant increase in the demand for construction sand,river sand resources over-exploitation caused serious ecological and environmental problems at the same time,river sand resources are increasingly depleted scarce.Looking for river sand resources alternative products is getting more and more urgent.Our country has a long coastline,the sea area is vast,seawater and sea sand resources are more abundant.So in this context,the sea sand as a substitute for river sand has become one of the effective ways to solve the problem.In the process of desalination,the desalination efficiency of sea sand is low,taking up large space,poor economic efficiency and other prominent issues.It is particularly important that the process of sand desalination will consume a lot of fresh water resources,China is one of the water shortage countrys in the world,the consumption of large quantities of fresh water resources does not meet the needs of sustainable development.Therefore,directly applying the seawater,sea sand to the concrete engineering becomes a significant tentative research.The direct use of seawater and sea sand is bound to introduce Cl-in the concrete and how to cure Cl--in the concrete,which is the most important problem to be solved urgently in the application of seawater and sea sand.In this study,it is proposed to solve the above Cl-curing problem by using high-volume ground slag,but the extensive incorporation of ground slag will inevitably produce more dry shrinkage cracks in concrete.In view of this,it is proposed to add the expansion agent to compensate for the shrinkage of concrete deformation,to avoid the emergence of cracks.In summary,this study intends to simulate the seawater and sea sand as the basic raw material,complexing slag and expansion agent,through the experimental study of sea sand and seawater concrete direct application feasibility.The main work of this study and the results of the research are as follows:(1)Artificial sea sand and sea water in the scope of this study can be a good simulation of natural sea sand and sea water is feasible and scientific,the use of slag as mineral admixture,The rationality and superiority of HP-CSA as expansion agent in the scope of this study,and the compatibility of the test materials within the scope of this study.(2)The compressive strength of seawater concrete was simulated by artificial simulation.The compressive strength of the test groups and the water-curing group were studied and analyzed.The multivariate linear regression analysis of the compressive strength of the labeled group was carried out.The calculated results of the empirical formula were analyzed with the measured data;(3)The artificial accelerated carbonization test of artificial seawater concrete was carried out.The effects of the depth of concrete carbonation on the slag,the presence of HP-CSA,and the presence of Cl-.The linear regression analysis was carried out with the carbonation depth as the dependent variable.The calculated results of the empirical formula were compared with the measured data.The representative concrete carbonation prediction model was researched and the four classical models were validated by using the experimental data.The results show that the applicability of the traditional models were quite limited.(4)The water-soluble Cl-content test and the alkalinity test of artificial pore solution were carried out.Because the test material contains more Cl-,the mineral admixture has a certain effect on the curing Cl-,but it is not significant.The use of HP-CSA has no negative effect on the curing of the ground slag.