Experimental Study of Crack Propagation in Cracked Concrete

Wang, Siyao; Hu, Shaowei

doi:10.3390/en12203854

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…The research on concrete cracking is relatively extensive at home and abroad. It mainly focuses on the causes of cracks, crack control and numerical simulation, characteristics of cracks, and so on [10][11][12][13]. However, there are relatively few experimental studies on the carbonation law of concrete at the crack [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Carbonation Behavior of Cracked Concrete

et al. 2022

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The crack and carbonation of concrete pose a great challenge to its durability. Therefore, this paper studies the effect of cracks on the carbonation depth of cement paste under different factors. The relationship between carbonation and cracks was determined, and the carbonation mechanism of cement paste with cracks was clarified. The results show that a small water–binder ratio can effectively inhibit the carbonation process. The bidirectional carbonation enlarged the carbonation area around the crack. Within 21 days of the carbonation, the carbonation depth increased with carbonation time, and the Ca(OH)2 on the surface of the specimen was sufficient, allowing for a convenient chemical reaction with CO2. The influence of crack width on the carbonation process at the crack was greater than the influence of the crack depth. Carbonation influenced the hydration of cement-based materials, altering the types and quantities of hydration products. In conclusion, accurately predicting the regularity of carbonation in cracked structures is critical for improving the durability of concrete.

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Section: Introductionmentioning

confidence: 99%

Analysis of Carbonation Behavior of Cracked Concrete

et al. 2022

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“…RE a brittle material having low flexural strength and poor damage resistance when compared to contemporary building materials, requires improvement in the engineering properties. All types of soils have poor resistance to tensile stresses; hence, reinforcing them with discrete fibres has shown a very impressive improvement in the behaviour of soils (Li et al 2014;Hu et al 2021;Wang and Hu 2019;Jiang, Cai, and Liu 2010). While stabilizers like cement can help achieve durability and strength enhancement properties, fibres can provide ductility by improving their tensile and flexural strength.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of polypropylene fibres on the flexural properties of compressed earth blocks was studied and it was seen that when the fibre content exceeded 0.6%, the blocks exhibited deflection-hardening behaviour (Donkor, Obonyo, and Ferraro 2021). It is to be observed that during crack propagation, the crack driving forces always widen the cracks and the cohesive forces bridge the cracks (Wang and Hu 2019).…”

Section: Introductionmentioning

confidence: 99%

Cement–nanosilica stabilized fibre-reinforced rammed earth: compressive and flexure behaviour

Neha Vivek,

Prasanna Kumar,

Reddy

2024

Asian J Civ Eng

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Rammed earth (RE) is a brittle material that can undergo sudden catastrophic failures under ultimate stress. Such sudden catastrophic failures can be avoided in RE structures with the addition of randomly oriented polypropylene fibres where crack propagation can be inhibited.Further, the strength of RE can be enhanced by the addition of nanomaterials, which make RE denser because of their high specific surface area. This research deals with studies on the effect of polypropylene fibre and nanosilica on the behaviour of cement stabilized rammed earth (CRE) under compression and flexure. The effect of fibre volume fraction and nanosilica content on the strength and stress-strain characteristics has been evaluated. Three polypropylene fibre volume fractions (0.2%, 0.3% and 0.4%) and five nanosilica contents (0.2%, 0.4%, 0.6%, 0.8% and 1%) were considered in this investigation. The compressive strength of fibre reinforced CRE increased by 30% for 0.3% of polypropylene fibre content and by 41% for 0.6% of nanosilica content when compared to CRE. The strain at peak stress has significantly increased with the addition of fibres indicating improved ductility and postpeak response of the material. The microscopic analysis showed that the addition of nanosilica has contributed to a denser packing of soil particles and hence, might have increased the compressive strength.

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Cement- Nanosilica Stabilized Fibre Reinforced Rammed Earth: Compressive and Flexure Behaviour

A¹,

P²,

Reddy³

2023

Preprint

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Rammed earth (RE) is a brittle material that can undergo sudden catastrophic failures under ultimate stress. Such sudden catastrophic failures can be avoided in RE structures with the addition of randomly oriented polypropylene fibres where crack propagation can be inhibited. Further, the strength of RE can be enhanced by the addition of nanomaterials, which make RE denser because of their high specific surface area. This research deals with studies on the effect of polypropylene fibre and nanosilica on the behaviour of cement stabilized rammed earth (CRE) under compression and flexure. The effect of fibre volume fraction and nanosilica content on the strength and stress–strain characteristics has been evaluated. Three polypropylene fibre volume fractions (0.2%, 0.3% and 0.4%) and five nanosilica contents (0.2%, 0.4%, 0.6%, 0.8% and 1%) were considered in this investigation. The compressive strength of fibre reinforced CRE increased by 30% for 0.3% of polypropylene fibre content and by 41% for 0.6% of nanosilica content when compared to CRE. The strain at peak stress has significantly increased with the addition of fibres indicating improved ductility and post-peak response of the material. The microscopic analysis showed that the addition of nanosilica has contributed to a denser packing of soil particles and hence, might have increased the compressive strength.

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Experimental Study of Crack Propagation in Cracked Concrete

Cited by 5 publications

References 35 publications

Analysis of Carbonation Behavior of Cracked Concrete

Analysis of Carbonation Behavior of Cracked Concrete

Cement–nanosilica stabilized fibre-reinforced rammed earth: compressive and flexure behaviour

Cement- Nanosilica Stabilized Fibre Reinforced Rammed Earth: Compressive and Flexure Behaviour

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