Study on the performance evaluation and prediction model of self-compacting concrete in steel shell immersed tube

^1. Shenzhen-Zhongshan Link Administration Center, Zhongshan 528400, Guangdong, China ;
^2. CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China ;
^3. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China ;
^4. International Center of Integrated Protection Research of Engineering Structures, Nanjing 211816, China )

^* E-mail: yfang1@cccc4.com

Abstract

In order to study the quality control and evaluation methods of self-compacting concrete (SCC) pumping process in Shenzhen-Zhongshan Bridge and similar projects, sample test is performed on self-compacting concrete mixture collected from the pumping field of the E1-E4 steel shell immersed tube; Then a database base on relationship between the variation parameters and the target performance is established. On this basis, the Grey system theory is adopted to analyze the parameter sensitivity of the SCC pumping performance to the different kinds of variables. The results show that variables are related to target performance and some of the variables have a significant influence. Using the powerful data mining capability of support-vector machine and Bayesian statistical inference in the case of uncertain exact mathematical relationship between independent variables and dependent variables, implicit and explicit prediction models of variation of SCC pumping performance are respectively established by pumping distance, number of elbows, pumping time and environmental temperature as the control parameters. Finally, the comparisons between the measured data and calculation result prove that both models have good prediction accuracy and stability.