Shrinkage Test And Numerical Simulation Of Self-compacting Concrete In Nuclear Power Plant Containment

Self-compacting concrete is a kind of concrete with high fluidity, it can better filled dense steel bar and complicated structure. Nowadays, our country using modular construction method in the construction of nuclear power plants. But modular construction method encountered some problems such as: operation space narrow, height of the concrete pouring, a lot of embedded parts and pipes. Also steel-concrete composite structure system are easy to form a casting defects, so using self-compacting concrete can solve these problems better. However, the content of cementitious material in self-compacting concrete is larger than normal concrete, thus lead to autogenous shrinkage and drying shrinkage variation more complicated. Containment is the last barrier of a nuclear power plant. in order to prevent cracking produced by drying shrinkage stress, so the study of concrete dry shrinkage performance of nuclear power plant containment is significance. In this paper, throught 360 d experimental study on drying shrinkage of self-compacting concrete in nuclear power plant, and based on the finite element method by using the software of ANSYS numerical simulation. draw the following conclusions:(1) The cube compressive strength, axial compressive strength, static compression elastic modulus, Poisson’s ratio and dry shrinkage of self-compacting concrete are measured by the mechanical properties and drying shrinkage test of self-compacting concrete for a nuclear power station containment. Which not only provide test results for design and construction of nuclear power plants, but also provides important parameters for the shrinkage simulation of self-compacting concrete.(2) The internal moisture diffusion law of self-compacting concrete is the same basically through the simulation for dry shrinkage. The first and second groups completely dry in about 240 d, but the third to the fifth groups at around 210 d is completely dry. The drying shrinkage of self-compacting concrete has small change after 210 d and the simulation of humidity field has good agreement with the test case.(3) The measured values and the simulation value difference of the dry shrinkage in 60 d to 210 d is about(100 ~ 200)×10-6, and analog value is greater than the measured values, which in conformity with the internal humidity field change of the concrete. Self-compacting concrete completely dry at 240 d, so concrete shrinkage rate is larger than the measured value, and the differences of measured and calculated values at 360 d of final shrinkage rate is within the 50×10-6.(4) The measured shrinkage curves of self-compacting concrete agree well with numerical simulation, that is to say, the method that using temperature field module in ANSYS simulate the humidity field of self-compacting concrete and using ANSYS thermal-structural coupling calculate drying shrinkage curve is feasible.