Investigations on the Response of Novel Layered Geopolymer Fibrous Concrete to Drop Weight Impact

Abstract

In recent years, geopolymer concrete (GC) has become more popular in construction because of its multiple benefits, such as eco-friendliness, high temperature resistance and resistance to chemical attack in harsh environments. However, GC has limited deformation capability and tensile strength compared to ordinary concrete. Geopolymer fibrous concrete (GFC) exhibits high mechanical properties, such as compressive strength and impact strength. This study aimed to develop a novel composite comprising GFC at the tension zone and GC at the compression zone, and vice versa, are these composites were examined. The impact resistance of two-layered GC-GFC with various ratios (25–75, 50–50, 75–25%) was examined. In addition, a single layer specimen comprising GC and GFC was fabricated and tested as the reference specimen. Twenty-nine mixtures were developed and divided into four series. Four different types of fibre were used in this study; short polypropylene fibre, long polypropylene fibre, short steel fibre and long steel fibre. The ACI committee 544 drop weight test was used to evaluate the impact strength of specimens. Results indicated that the impact strength of GFC was significantly improved in long steel fibre-based specimens. In addition, two-layered specimens comprising different fibres—short polypropylene, long polypropylene, short steel and long steel—exhibited a positive influence on impact strength. Compared to a single-layer specimen, inferior impact strength was recorded in the two-layered specimen.

Enhancing the Impact Strength of Prepacked Aggregate Fibrous Concrete Using Asphalt-Coated Aggregates

“…Asphalt-coated aggregate added to concrete did not affect the brittle failure mode. Non-fibrous cylindrical specimens were commonly subjected to this form of brittle failure, as reported in the scientific literature [ 10 , 52 ]. As a result of concrete’s heterogeneity and brittleness and the absence of any bridging elements, this behaviour was observed.…”

High-Performance Construction Materials: Latest Advances and Prospects

“…In Murali et al's other work [10] in this Special Issue, a novel composite comprising geopolymer fibrous concrete (GFC) at the tension zone and geopolymer concrete (GC) at the compression zone was developed. The results indicated that the impact strength of GFC was significantly improved in long steel fiber-based specimens.…”

Behaviour of Hybrid Fibre-Reinforced Ternary Blend Geopolymer Concrete Beam-Column Joints under Reverse Cyclic Loading

“…The incorporation of hybrid fibres on the ductility and impact resistance of GGBS-based GPC was studied and it was concluded that the ductility index was enhanced efficiently [ 48 , 49 , 50 ]. The impact resistance of GPC was also improved significantly with the introduction of fibres in mono and hybrid forms, changing the mode of failure from brittle to ductile [ 51 ].…”