Abstract
Questions connected to influence of frost degradation on microstructure and physical properties of water saturated cement mortars and their resistance to cyclic water freezing are the objectives of research. The main aim of the investigation is to analyze the ice-induced deterioration of cement mortars with different water/cement ratios (w/c=0.50 and 0.40) in a accelerated durability tests. The changes of pore size distribution and water absorption coefficient are investigated by means of mercury intrusion porosimetry and capillary absorption test. Additionally, the analysis of the impact of drying temperature (40°C, 60°C, 80°C and 105°C) on the microstructure is introduced.The performed tests enabled to estimate that the destruction of the cement matrix and the range of observed changes depend on the initial pore size distribution and their volume in the cement matrix. It is also established that the increase of transport properties is correlated with the change of pore size distribution. The obtained results allow to conclude a decrease of content of small pores (up to 150nm) and increase of larger pores for mortar with w/c=0.50. Application of superplasticizer, which resulting in reduction of water to cement ratio up to 0.40, allows to obtained resistant to 150 frost cycles cement mortar.
Highlights
Cement-based materials are frequently exposed to aggressive environment such as cyclic water freezing
The porous materials are built of the solid skeleton and the pores, which might be filled with the gaseous and the liquid phase
Experiments have been performed on cement mortar specimens with different water to cement ratios (w/c equal to 0.5 and 0.4)
Summary
Cement-based materials are frequently exposed to aggressive environment such as cyclic water freezing. The microstructure is one of the most important characteristics, which estimates the durability of cement based materials [2]. The knowledge about the porosity and the pore size distribution is extremely important considering the frost durability of the material [3, 4]. Cyclic water freezing impacts the material transport properties [6]. The main objective of the investigation is to analyze the ice-induced deterioration of cement-based materials in a accelerated durability tests. The purpose of the experimental study is to examine experimentally the effect of cycling water freezing on the microstructure and transport properties of cement mortar. The paper presents a study of the impact of drying temperature (40°C, 60°C, 80°C and 105°C) on the microstructure of cement mortar with w/c=0.40
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