An upscaling method for predicting the behavior of concrete structures under brine attack

Gili Lifshitz Sherzer, Konstantin Kovar, Guang Ye, Erik Schlangen, Erez Gal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Concrete contains layers of complexity and considered as a heterogeneous material, thus assessing the concrete response through multiscale analysis, requires a development of up scaling approach. Concrete being a composite material that contain more than two finely mixed constituents, results a complex modelling procedure. The multiscale approach is achieved by retrieving the macroscopic properties from the cement and mortar scales. The overarching goal of this paper is to apply the Lattice model developed in Delft in order to obtain the compression numerical parameters, required for the evaluation of the Lattice Discrete Particle Model (LDPM) Pore Collapse and Material Compaction parameters. This aim was successfully achieved in the Microlab/Section of Materials and Geosciences, under the co-workers of Prof. Klaas van Breugel, Prof. Erik Schlangen and Dr. Ye Guang. Towards this goal, the specific scientific objective of this paper is to formulate, calibrate, and validate multi-scale models based on the homogenization of a recently developed discrete meso-scale model known as the Lattice Discrete Particle Model (LDPM). Furthermore, in this paper, a multiscale analysis procedure is proposed for modelling concrete structures, in which material properties at the macro scale are retrieved from the components and their geometrical distribution in the micro structure. In addition, we implemented the up-scaling method in order to analyses the stability, longevity, and durability of a concrete wall located at the Dead Sea. The models were calibrated and validated using experimental results and the results looks promising as microscopic calibrated parameters were able to predict accurate macroscopic results. 17 th Euroseminar on Microscopy Applied to Building Materials 253 INTRODUCTION Predicting the behavior of concrete structures is increasingly difficult. Usually the mechanical behavior of concrete is macroscopically modeled via plastic constitutive relations [1-3]. These macroscopic models are characterized by the large number of parameters needed to be calibrated in order to analyze the complex behavior of the concrete at the different stages of loading and at the different damage modes. Using these macroscopic models is complicated due to the fact that the concrete has a variety of microstructures and actually has no distinctive microstructure. The concrete mix design has to meet new standards technology of high-performance solutions that includes: addition of fibers made up from different materials; aggregate-size distribution, shape and type; water to cement ratio etc. The use of multi-scale analysis evidently is the appropriate way to model the behavior of concrete structures by coupling between the concrete micro-structures and its macroscopic properties needed to analyze a structure [4-16]. There are researches that deals with the influence of multi-scale micro structure on concrete thus, enabling a description of the heterogeneous character of the cement paste and evaluation of its mechanical properties according to its hydration processes [17-21].
Original languageEnglish
Title of host publication17th Euroseminar on Microscopy Applied to Building Materials
Pages252-259
StatePublished - 20 May 2019

Fingerprint

Dive into the research topics of 'An upscaling method for predicting the behavior of concrete structures under brine attack'. Together they form a unique fingerprint.

Cite this