Modification of the Structure and Properties of Lightweight Cement Composite with PVA Fibers

Sikarskas, Donatas; Antonovič, Valentin; Malaiškienė, Jurgita; Boris, Renata; Stonys, Rimvydas; Šahmenko, Genādijs

doi:10.3390/ma14205983

Cited by 8 publications

(7 citation statements)

References 40 publications

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“…The reason behind this behavior is related to the properties of PVA fibers which have a higher modulus of elasticity compared to that of PP fibers which leads to a reduction in the creep strain. This behavior conforms with the results of Donatas et al [19], who stated that PVA fibers own a high modulus of elasticity and may reduce the crack width, hence reducing the creep strain of the mix. Results displayed that a denser layer of hydration products was formed around the PVA fibers and the amount of the formed portlandite and C-S-H gel was higher around the PVA fibers, Fig.…”

Section: Ecc Microstructural Behavior When Using Polymer Fiberssupporting

confidence: 92%

CREEP Coefficient and Specific Creep of Engineered Cementitious Composite -Bendable Concrete

Al-Mulla,

Al-Ameeri,

Al-Attar

2024

Civil and Environmental Engineering

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Creep is a complex behavior of concrete since it induces different stages of response under loading and unloading with time. It represents the time-dependent strain as a result of a constant sustained load applied with time. In cementitious materials such as engineered cementitious composite concrete, ECC, the loaded cement paste is the principal source of creep strain. Therefore, investigating the overall creep behavior, under the loading and unloading stages, will be beneficial in providing data for the performance of ECC concrete. The test for compressional creep strain is done according to the ASTM C- 512 under controlled temperature (21 oC) and relative humidity (40%). In this research, the loading stage lasted for 9 months, and the unloading stage lasted 3 months. The total creep strain, creep coefficient, and specific creep were recorded for six ECC concrete mixes. The mixes have two strength levels, 30 and 60 MPa at 28 days, and contain polypropylene and polyvinyl alcohol fibers. Results revealed significant enhancement, and lower creep behavior, in mixes including fibers compared to plain mixes. The best promising results for the creep coefficient and specific creep were recorded when using mixes of 60 MPa containing polyvinyl alcohol fibers compared to plain mixes.

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Section: Ecc Microstructural Behavior When Using Polymer Fiberssupporting

confidence: 92%

CREEP Coefficient and Specific Creep of Engineered Cementitious Composite -Bendable Concrete

Al-Mulla,

Al-Ameeri,

Al-Attar

2024

Civil and Environmental Engineering

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“…The foam concrete produced after optimization shows fine cracks on the surface ( Figure 11 a), indicating the foam concrete has poor cracking resistance. The PVA fibers have good affinity with cement-based cementitious materials [ 39 ], and in order to ensure the integrity of foam concrete, the PVA fibers with high elastic modulus are incorporated to improve the cracking resistance. The compressive-flexural strength ratio is an important index to characterize the flexibility of foam concrete, which can well reflect the cracking resistance of foam concrete.…”

Section: Resultsmentioning

confidence: 99%

Research on the Improving Performance of Foam Concrete Applied to the Filling of Natural Gas Pipeline Cross-River Tunnel

Chen

et al. 2022

Materials

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The shield tunnel is a common solution for natural gas pipelines crossing rivers. Consequently, the development of natural gas tunnel filling materials with excellent performance is crucial to the safe operation and maintenance of pipelines. The foam concrete offers a reasonable solution. Nevertheless, since its inherent compressive strength decreases almost proportionally with the decrease in density, obstacles remain concerning obtaining the high density and relatively low strength required for natural gas tunnel filling. Here, a synergistic optimization strategy was proposed involving the orthogonal test, univariate control, and comprehensive balance method. It involves modifying the type and proportion of cementitious matrix, in particular by incorporating fly ash and PVA fibers in the mix design, and synergetic determining the best mix ratio from the aspects of compressive strength, stability, and dry density. The obtained foam concrete has a compressive strength of 4.29 MPa (FC4) and a dry density of 1060.59 kg/m3 (A11), which meets the requirements of pipeline pressure and pipeline anti-floating. This study is applied to the Yangtze River shield crossing project of the Sino-Russian Eastern Gas Pipeline, and ANSYS was used to simulate the stress and deformation of the foam concrete. This work provides an efficient foam concrete optimization mix scheme, and supports the application of foam concrete in the filling of the long-distance cross-river natural gas tunnels.

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“…Adeyemi et al [12] determined that the 2% PVA fber content is adequate to prevent any cracks resulting from shrinkage in ECC mixtures. Donatas et al [13] revealed that PVA fbers that have high modulus of elasticity may decrease the crack width and consequently reduce the drying shrinkage. Sara Saed et al [14] displayed that the use of two types of Portland limestone cement, Karasta (CK) and Tasluja (CT) PLC, leads to a reduction in drying shrinkage and creep due to the chemical composition of the two types of the cement and the calcium carbonate percent added to the clinker; therefore, less clinker/cement ratio gives lower creep and shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Drying Shrinkage Strain of Engineered Cementitious Composite Concrete Contains Polymeric Fibers

Al-Mulla,

Al-Ameeri,

Al-Attar

2024

Journal of Engineering

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The lack of concrete tensile stress endurance led to the invention of engineered cementitious composite. However, the absence of gravel from the mixture in addition to the high binder content may lead to high shrinkage strain. Therefore, a radical solution to this problem is worth to be anticipated. The importance of this research lies in investigating the long-term drying shrinkage strain of the engineered cementitious composite since there is a lack of information regarding this behavior. Mixes of 30 and 60 MPa strengths were produced with polyvinyl alcohol fibers PVA-ECC and polypropylene fibers PP-ECC. The drying shrinkage strain of PVA-ECC mixes has been compared to PP-ECC mixes for both short term (0–28 days) and long term (0–360 days). Results indicated that all PVA-ECC mixes exhibited lower drying shrinkage strains than PP-ECC mixes. The ultimate drying shrinkage strain was recorded to be 1200 microstrain at 28 days. The increment in drying shrinkage strain after 28 days was 5.6% in PVA-ECC mixes when compared to that in PP-ECC mixes which was 6.77%. For high strength levels, the drying shrinkage strain at the age of 360 days declared a reduction of 3.5% for PVA-ECC compared to PP-ECC mixes. Also, it was lower for mixes with 60 MPa (6.3%) than for mixes with 30 MPa (7.6%). Therefore, despite the higher cement content for mixes with 60 MPa strength, the higher fiber volume fraction and the higher PVA solution percentage restricted the drying shrinkage strain increment. The research also addresses some mechanical tests of engineered cementitious composite concrete such as compressive strength, flexural strength, and strain capacity that may provide a strong relation to the drying shrinkage behavior of the different mixes. The scanning electron microscope images were involved in this research to declare the impact of fiber types on the microstructure of the ECC mixes.

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Modification of the Structure and Properties of Lightweight Cement Composite with PVA Fibers

Cited by 8 publications

References 40 publications

CREEP Coefficient and Specific Creep of Engineered Cementitious Composite -Bendable Concrete

CREEP Coefficient and Specific Creep of Engineered Cementitious Composite -Bendable Concrete

Research on the Improving Performance of Foam Concrete Applied to the Filling of Natural Gas Pipeline Cross-River Tunnel

Long-Term Drying Shrinkage Strain of Engineered Cementitious Composite Concrete Contains Polymeric Fibers

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