| Citation: |
GAO Peng, CHU Shengjie, WEI Haitao, et al. Experimental study on mechanical properties of bundled basalt fiber reinforced concrete[J]. Acta Materiae Compositae Sinica.
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In order to study the mechanical properties of bundled basalt fiber (BBF) reinforced concrete, cube compressive strength, splitting tensile strength and fracture toughness experiments of fiber reinforced concrete with different fiber lengths (12 mm, 18 mm, 24 mm), volume fraction (0.1%, 0.2%, 0.3%) and types (bundled basalt, chopped basalt and polypropylene) were carried out. And the microstructure was observed by scanning electron microscopy. Results show that the effect of BBF on compressive strength of concrete is not obvious; when the fiber length is 24 mm and the dosage is 0.2%, the maximum increase of tensile strength is 26.65%. With the reinforcement index (RI) increases, the tension-compression ratio of BBF concrete tends to increase, and when RI gets to 24, the tension-compression ratio is 1.39 times that of NC. Incorporation of BBF generally increases three-point bending peak load, initiation toughness and unstable toughness of concrete, in which the maximum increase rate at 0.3% are 53.66%, 47.06% and 151.03%, respectively. Scanning electron microscopy shows that a large number of hydration products are attached to surface of BBF, which are closely bonded to cement paste and have no obvious interface transition zone with matrix, effectively inhibiting propagation of micro-cracks.
At present, research on mechanical properties of Bundled Basalt Fiber ( BBF ) reinforced concrete is mainly based on high performance concrete with small coarse aggregate size or no coarse aggregate. Normal concrete ( NC ) with a maximum coarse aggregate size of 25 mm was used as BBF reinforced concrete. Basic mechanical properties and microscopic mechanism of BBF reinforced NC were studied and compared with chopped basalt fiber ( CBF ) and polypropylene fiber ( PPF ), highlighting the superiority of BBF as a reinforcing fiber.
Slump, cube compressive strength, splitting tensile strength and three-point bending fracture toughness of BBF, CBF and PPF with different dosage ( 0.1%, 0.2% and 0.3% ) and fiber length ( 12 mm, 18 mm and 24 mm ) were tested. After macroscopic mechanical property tests were completed, made material samples, and microscopic morphology of typical specimens was observed by Gemini 500 thermal field emission scanning electron microscope, and microscopic mechanism was analyzed.
With increase of BBF dosage, slump of concrete decreased significantly. When dosage of BBF is 0.3%, slump of concrete is reduced by 180 mm compared with NC. Fiber length has a relatively small effect on slump of concrete. With increase of fiber length from 12 mm to 24 mm, slump of concrete decreased by 30 mm, 60 mm and 20 mm respectively compared with NC. Compared with other fiber types, BBF has less effect on concrete slump. BBF has no significant effect on compressive strength of concrete. With increase of fiber length, compressive strength of concrete decreases significantly. When BBF increases from 12 mm to 18 mm, compressive strength of concrete decreases the most. However, BBF significantly improved compressive failure mode of concrete. With increase of BBF dosage, the number of cracks on surface of concrete decreased significantly and width decreased. With addition of BBF, splitting tensile strength of concrete increases significantly, and increases first and then decreases with increase of BBF dosage. With increase of fiber length, overall trend is increasing. Compared with other dosage levels, when dosage is 0.2%, splitting tensile strength of BBF concrete is the highest, which is 13.5 % higher than that of NC. Compared with other fiber lengths, splitting tensile strength at 24 mm is 26.6 % higher than that of NC. Incorporation of BBF significantly prolonged time from loading to failure of three-point bending fracture toughness test specimen. Extend propagation path of prefabricated cracks ; and significantly increased peak load, initiation toughness and unstable toughness of concrete. When dosage is 0.3%, the maximum increase rate was 53.66%, 47.06% and 151.03%, respectively. Scanning electron microscope photos show that surface of BBF is covered with a large number of hydration products, and it still exists in form of clusters in concrete, which effectively inhibits expansion and connection of cracks on both sides.Conclusions：The enhancement effect of BBF on concrete is significantly better than that of CBF and PPF. BBF has little effect on improvement of compressive strength of concrete, but it can significantly improve compressive failure mode. BBF has a significant effect on splitting tensile strength and three-point bending peak load of concrete. Due to surface hydroxyl group, BBF combines with water molecules to form hydrogen bonds, and adsorbs more hydration products with hydration reaction, so that there is no obvious interface transition zone between fiber and matrix, and bonding force with matrix is strong, and fiber reinforcement effect is better.
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