The Application Research Of Compensating Concrete In Large Scale Reinforced Concrete Structure

The compensating concrete is widely used in large scale reinforced concrete structures.However,there are still some shortcomings in the actual engineering,such as the dosage of expansive agent is not clearly defined,and the concrete strength is reduced due to improper construction.Therefore,the study of the compensating concrete in large scale reinforced concrete structures has important economic and practical significance.Firstly,through the monitoring of large volume compensating concrete and compensating concrete slabs in the early curing process,the concrete internal strain variation,caused by cold contraction and other factors was investigated.Contrasting the early internal strain curve of expansive concrete slab under different expansive agents,the optimal dosage of expansion agent were selected.Test results illustrate: the early tensile strain of concrete under 4% expansive admixture is close to its ultimate tensile strain,at this time the concrete internal may produce cracks.While the content of the expansion agent is more than 9%,the increase of the pre pressure strain is not obvious.Therefore,when the content of the expansion agent is 9%,the control effect is the best.Secondly,Through the in-situ monitoring of over-long compensation concrete in actual engineering,the influence of the change of the point temperature in different positions and the existence of the expansion agent on floor strain was discussed.Test results show that structural deformation caused by shrinkage and temperature would be reduced with certain percentage of UEA added in the floor of over-long structures.It also could prevent the cracks of structure.The method of real-time monitoring of the whole process of early strain of post-poured strip in compensation concrete could adjust maintenance plan and the change of strain inside the concrete.The method also could control the generation of cracks.Finally,this paper established the spring constraint model of "anti-release" combi nation of mass concrete,through simulated the internal strain of the model by ABAQ US software,and compared with experimental research,simulated and analyzed the r ole of compensating concrete in large-scale reinforced concrete structure,and provide a reference for the application of compensated concrete in large scale reinforced concrete structure.