Strength, Drying Shrinkage, and Carbonation Characteristic of Amorphous Metallic Fiber-Reinforced Mortar with Artificial Lightweight Aggregate

Abstract

This paper investigates the strength, drying shrinkage, and carbonation characteristic of amorphous metallic fiber-reinforced mortar with natural and artificial lightweight aggregates. The use of artificial lightweight aggregates has the advantage of reducing the unit weight of the mortar or concrete, but there is a concern that mechanical properties of concrete such as compressive strength and tensile strength may deteriorate due to the porous properties of lightweight aggregates. In order to improve the mechanical properties of lightweight aggregate mortar, we added 0, 10, 20, and 30 kg/m3 of amorphous metallic fibers to the samples with lightweight aggregate; the same amount of fiber was applied to the samples with natural aggregate for comparison. According to this investigation, the flow of mortar decreased as the amount of amorphous metallic fiber increased, regardless of the aggregate type. The compressive strength of lightweight aggregate mortar with 10 kg/m3 amorphous metallic fiber was similar to that of the LAF0 sample without amorphous metallic fiber after 14 days. In addition, the flexural strength of the samples increased as the amount of amorphous metallic fiber increased. The highest 28-d flexural strength was obtained as approximately 9.28 MPa in the LAF3 sample, which contained 30 kg/m3 amorphous metallic fiber. The drying shrinkage of the samples with amorphous metallic fiber was smaller than that of the sample without amorphous metallic fiber.

Experimental Study on Mechanical Properties and Optimization of Chopped Basalt Fiber Reinforced Concrete

“…In summary, it can be seen that the incorporation of a small amount of CBFs, while not affecting the concrete workability and reducing the appearance of shrinkage cracks during concrete curing [39], can also effectively improve the early strength, which is beneficial to construction and structures with a requirement of concrete early hardening. It also improves the crack resistance and toughness of the members, which can help improve the durability and deformation and the energy-dissipation capacity of concrete structures.…”

Carbonation of Shale Ceramsite High-Strength Lightweight Concrete Incorporating Graphene Oxide

“…Lo et al confirmed that the lower the water-cement ratio of both NWC and LWAC, the stronger the carbonization resistance [7]. Choi et al found that the carbonation depth of natural lightweight aggregate paste was slightly lower than that of artificial aggregate paste, which was presumably caused by porosity [8]. In order to enhance the resistance to carbonization, some additives or mineral materials are used.…”