EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF FIBER REINFORCED LIGHTWEIGHT AGGREGATE CONCRETE AFTER FREEZE-THAW CYCLE

Tests were carried out to study mechanical properties of hybrid fiber reinforced full lightweight aggregate concrete (HFRFLAC), the hybrid fiber was composed by steel fiber and polypropylene fiber, the expanded-shale and lightweight sand were used as coarse and fine aggregates. The apparent density and strengths in cubic compressive, splitting tensile and flexural tensile states of HFRFLAC were obtained. The results show that the average dry apparent density increases with the increasing cement content, which is much more affected by fraction of steel fiber by volume than mass content of polypropylene fiber; the tensile strengths increase somewhat with the increasing mass content of polypropylene fiber; all of the strengths increase with the increasing fraction of steel fiber by volume, and obvious are the enhancement of tensile strengths; there are somewhat relevance between the effects of polypropylene fiber and steel fiber on mechanical properties of HFRFLAC.

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Mechanical Properties of Steel Fiber Reinforced Lightweight Aggregate Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.366.12 ◽

2011 ◽

Vol 366 ◽

pp. 12-15 ◽

Cited By ~ 6

Author(s):

Chang Yong Li ◽

Huai Chen ◽

Shun Bo Zhao

Keyword(s):

Mechanical Properties ◽

Steel Fiber ◽

Lightweight Aggregate ◽

Lightweight Aggregate Concrete ◽

Fiber Reinforced ◽

Aggregate Concrete ◽

Flexural Tensile Strength ◽

Axial Tensile ◽

Mix Proportion ◽

Expanded Shale

Experiments were conducted to study the basic properties of steel fiber reinforced lightweight aggregate concrete (SFLAC) mixed with machine-made sand and expanded-shale. The effects of sand ratio and cement content on the cubic and axial compressive strengths, splitting and axial tensile strengths, flexural tensile strength as well as compressive and tensile elastic modulus of SFLAC are analyzed comparing with those of LAC in the same conditions. Data from the experiments shows that, the steel fiber has advantages to every mechanical properties of LAC especially to the tensile strengths, and also modifies the abruptness failure states of LAC into multi-cracked characteristics of SFLAC. The optimum mix proportion is suggested for getting better properties of SFLAC.

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Experimental Study on Freeze-Thaw Damage Mechanism of Lightweight Aggregate Concrete

Recent Advancement in Conrete Freezing-Thawing (F-T) ◽

10.1520/stp49085s ◽

2010 ◽

pp. 103-103-16

Author(s):

Jize Mao ◽

Koichi Ayuta ◽

Hui Qi ◽

Zongmin Liu

Keyword(s):

Experimental Study ◽

Lightweight Aggregate ◽

Damage Mechanism ◽

Lightweight Aggregate Concrete ◽

Aggregate Concrete ◽

Freeze Thaw

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Residual Mechanical Properties of Fiber-Reinforced Lightweight Aggregate Concrete after Exposure to Elevated Temperatures

Applied Sciences ◽

10.3390/app10103519 ◽

2020 ◽

Vol 10 (10) ◽

pp. 3519 ◽

Cited By ~ 1

Author(s):

Chao-Wei Tang

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

High Temperature ◽

Flexural Strength ◽

Elevated Temperatures ◽

Lightweight Aggregate ◽

Lightweight Aggregate Concrete ◽

Fiber Reinforced ◽

Aggregate Concrete ◽

Residual Mechanical Properties

In this study, the effects of individual and mixed fiber on the mechanical properties of lightweight aggregate concrete (LWC) after exposure to elevated temperatures were examined. Concrete specimens were divided into a control group (ordinary LWC) and an experimental group (fiber-reinforced LWC), and their compressive strength, elastic modulus, and flexural strength after heating to high temperatures of 400–800 °C were investigated. The four test parameters included concrete type, concrete strength, fiber type, and targeted temperature. The test results show that after exposure to 400–800 °C, the variation in mechanical properties of each group of LWC showed a trend of increasing first and then decreasing. After exposure to 400 °C, the residual mechanical properties of all specimens did not attenuate due to the drying effect of the high temperature and the more sufficient cement hydration reaction. However, after exposure to 800 °C, the residual mechanical properties significantly reduced. Overall, the mixed fiber-reinforced LWC showed a better ability to resist the loss of mechanical properties caused by high temperature. Compared with the loss of compressive strength, the flexural strength was relatively lost.

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