Abstract
This paper presents a novel resin concrete obtained by adding cubic zirconium tungstate (ZrW2O8) as filler. A prediction algorithm on the thermal expansion coefficient (CTE) of resin concrete (including filler) was established on the basis of the meso-mechanics method and a three-phase model for concrete. The concept of twice mixing was also proposed for prediction accuracy. Then, a 2D and 3D irregular polygon aggregate particles packing model was set up by Matlab and the properties of the packing model were simulated by finite element analysis. Finally, resin concrete samples were made and their CTE were measured. Mix proportion and addition of ZrW2O8 as influencing factors were considered in this experiment. The CTE of resin concrete was verified by comparing results of the prediction model, simulation model and experiment. The optimum CTE obtained from the experiment was 1.504 × 10−6/K. Compared with 6.817 × 10−6/K without ZrW2O8, it was found that the addition of ZrW2O8 to resin concrete can make it perform significantly better in thermal expansion.
Highlights
Nowadays, ultra-precision machining technology is developing towards the scales of micron, submicron and nano
It is a kind of composite material that is mainly composed of aggregates of different sizes and liquid organic resin which hardens through polymerization reaction
Four CTE computational models were deduced based on the consideration of interactions between inclusions and the effect, if any, of inclusions on the matrix and the twice mixing method
Summary
Ultra-precision machining technology is developing towards the scales of micron, submicron and nano. Aiming at special demand of ultra-precision computer numerical control (CNC) machine tool for high thermal stability, negative thermal expansion (NTE) material is urgently needed It contracts upon heating within a certain range of temperature rises and adding NTE material can make the composite in CTE change. Schapery [7] further developed the prediction model and studied bounds on effective CTE of composite materials made up of isotropic phases based onthermo-elastic principles. Some scholars [13,14,15] have developed prediction models for CTE of concrete Many aspects, such as volume fractions of aggregate, elastic moduli of components, and aggregate type, were investigated to analyze their effects on concrete CTE. In order to reduce the CTE of resin concrete, we have tried to conduct research from three aspects: the first, making a prediction model; the second, establishing an irregular polygon aggregate particles packing model; the last, conducting experiments
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