A New Type Of Grouting Liquid Of Stable Grout And Hydraulic Concrete With Compound Admixture

The stable cement grouting material and the admixture concrete are cement-based silicate engineering materials. The stable grouting material the key technique of the GIN (Grouting Intensity Number) grouting method. The bentonite is used to dose stable grouting liquid for the standard grout. However,its cementrock has disadvantages-low strength,drying shrinkage and low durability. Toapply the GIN grouting method in practice and improve the grouting quality and its durability,it is necessary to develop the high performance grouting material.The admixture is of importance for hydraulic concrete. Utilization is of importance for hydraulic concrete. Utilization of the industrial scrap such as fly ash for concrete not only saves cement and invest,but also produces and improvement of concrete performance,including the cracking of mass concrete due to hydration heat.In this work develop is a new type of macromolecule polymer stability agent MAC for the GIN grouting method. It has strength of cement rock,low drying shrinkage,good groutability and construction convenience over the bentonite stabilizing agent. Furthermore the systematical investigation on the pozzolanic activity of the compound admixture of lithium-salt residue and fly ash has been carried out. It can confect high performance concrete for hydraulic engineering. The main results in this paper are as following:1. A new macromolecule (MAC) polymer-stabilizing agent has been presented and developed for first time. The grouting liquid with this stability agenthas many advantages such as the good volume stability,low dialysis ratio,high strength of cement rock less dry-shrink and convenient construction etc. When the water-cement ratio is 0.6 or 0.8,the 28d strength of cement-rock is 210% and 179% of the bentonite cement-rock under standard maintain. The 28d strength is about 134% and 129% that of the bentonite cement-rock under maintain in 20 water.2. In the test of developing the macromolecule polymer-stabilizing agent,a lots of macromolecule polymer have used by different ratio. The optimization ratio of macromolecule polymer has been found by use of the intersect test. The rheology of polymer concrete grouting has been studied by use the ZNN-D6. The study shows the character of composite polymer stabilizing agent grout is accord with the Bingham model.3. The theoretical calculation and simulating tests show that the grouting liquid with the stabilizing agent MAC has good groutability. It has higher spreading radius than that used bentonite as stabilizing agent under the same grouting pressure.4. The high activity compound admixtures of lithium-slat residue and fly ash has been developed for the first time. SEM has been used to analyze the microcosmic morphology of cement-rock,XRD to its phase,and IMP to the porosity structure. The grading and distribution of the porosity has also been analyzed. The grading of concrete aggregates and porosity have been studied by fractal geometry theory.5. the tests show that the activity of the compound admixtures of lithium-salt residue and fly ash is higher than that of fly ash and there is a optimum ratio between the lithium-salt residue and fly-ash. The activity of the compound admixtures is of importance for the later strength of concrete,especially for the 60d and 28d strength.