Abstract
One of the most effective ways to identify the concrete properties is to understand further about the cement mortar, which is a mixture of cement paste and fine aggregate. In order to identify the behavior of cement mortar, all required materials including cement, fine aggregate, water as well as the different ratios of each material should beinvestigated. The main objective of this research is to study the effectiveness of main parameters of mortar on the fracture mode and related factors. Specifically 26 mixing designs of flexural mortar with three cement strength classes (32.5, 42.5 and 52.5 MPa), three water to cement (W/C) ratios (0.25, 0.3 and 0.35) and three sand to cement (S/C) ratios (2.5, 2.75 and 3) were first prepared. The prepared samples were then tested using a stress-strain apparatus. Some pictures were finally taken from the fracture surfaces to investigate the mode and angle of fractures. The results indicated that any change in the main parameters of mortar changes the fracture mode and the fracture angle.
Highlights
Nowadays, obtaining information about the concrete and cement materials seems to be necessary due to several reasons such as the increase of construction [1] and the wide applications of concrete in different structures like buildings [2] dams [3], nuclear power plant [4] and bridges [5]
A graphical study has been performed in this research work to investigate the effect of main factors such as water to cement (W/C), sand to cement (S/C) ratios and cement strength class on the fracture mode of mortar by considering 26 mixtures of flexural samples prepared by standard metal molds of 4 × 4 × 16 cm according to ASTM [23] with three cement strength classes of 32.5, 42.5 and 52.5 MPa, three W/C ratios of 0.25, 0.3 and 0.35 and three S/C ratios of 2.5, 2.75 and 3
Investigating these flexural samples indicates that in the cement with the strength class of 32.5 MPa and constant W/C ratio, any change in S/C ratio changes the fracture angle. This may be due to the fact that there is an optimum S/C ratio which led to the highest compressive strength [24]
Summary
Nowadays, obtaining information about the concrete and cement materials seems to be necessary due to several reasons such as the increase of construction [1] and the wide applications of concrete in different structures like buildings [2] dams [3] , nuclear power plant [4] and bridges [5]. Due to the fact that the concrete is widely used in daily life [6,7,8,9], studying the parameters of mortar does essentially help the concrete to be applied in structures. In their experiments, different scholars have figured out the concrete to be an integrated homogenous material [10] which is consists of cement mortar and coarse aggregates. Snuck et al investigated the effect of W/C ratio and aggregate grade on the workability and hardened properties of mortar [20]
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