scholarly journals Effects of Supplementary Cementitious Materials and Curing Condition on Mechanical Properties of Ultra-High-Performance, Strain-Hardening Cementitious Composites

2021 ◽  
Vol 11 (5) ◽  
pp. 2394
Author(s):  
Min-Jae Kim ◽  
Booki Chun ◽  
Hong-Joon Choi ◽  
Wonsik Shin ◽  
Doo-Yeol Yoo
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Strain Hardening ◽  
High Performance ◽  
Tensile Behavior ◽  
Supplementary Cementitious Materials ◽  
Cementitious Composites ◽  
Cement Kiln ◽  
Strain Capacity ◽  
Test Result

This study investigated the influence of ordinary Portland cement (OPC) and reactive and non-reactive mineral additives on the characteristic microstructure and mechanical performance of ultra-high-performance, strain-hardening cementitious composites (UHP–SHCCs). Nine mixes of cementitious composites were considered composed of reactive and non-reactive materials, such as ground granulated blast furnace slag (GGBS), silica fume (SF), cement kiln dust (CKD), and silica flour. Compressive strength and direct tensile tests were performed on the nine mixes cured for 7 d and 28 d. The test result was analyzed based on microstructural inspections, including thermogravimetry and scanning electron microscopy. The test result and analysis showed that the microstructural property of the UHP–SHCC impacted the compressive strength and the tensile behavior and also influenced the fiber-matrix interaction. Although most of the 7 d cured specimens did not exhibit notable strain-hardening behaviors, the specimen containing the CKD exhibited a tensile strength of 11.6 MPa and a very high strain capacity of 7.5%. All the specimens with OPC, silica flour, GGBS, or SF exhibited considerably improved tensile behavior at 28 d. The specimen with only OPC as a binder could achieve the tensile strength of 11.6 MPa and strain capacity of 6.2%.

scholarly journals Tensile strength of 3D textiles reinforced cementitious composites plates

2018 ◽  
Vol 162 ◽  
pp. 04008
Author(s):  
Ikbal Gorgis ◽  
Waleed Abbas ◽  
Nadia Moneen
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Strain Hardening ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Cement Mortar ◽  
Glass Fabric ◽  
Cementitious Composites ◽  
3D Textiles

Tensile plate specimens with dimension of 450×100×40mm were cast with 3D glass fabric having three different thicknesses 6, 10 and 15mm to measure their tensile strength. Plates with one and two layers of chicken wires, as well as micro steel fiber of 0.75% volume fraction were tested under tensile for comparison with references plates. Cement mortar with 61.2MPa cube compressive strength at 28 days was designed for casing the plates. The results indicated that after cracking of the mortar the textile reinforcement adds a strain hardening trajectory, that cause failure to occurs at slightly higher load and a higher strain. The improvement in tensile strength at 28 days ranged between 5 to 30%, and for 90 days between 5 to 60% for the three types of fibres used. Based on the results a significant increase was indicated with micro steel fiber.

scholarly journals Recent Advances in Strain-Hardening UHPC with Synthetic Fibers

2021 ◽  
Vol 5 (10) ◽  
pp. 283
Author(s):  
Jian-Guo Dai ◽  
Bo-Tao Huang ◽  
Surendra P. Shah
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Strain Hardening ◽  
Crack Width ◽  
Tensile Strain ◽  
Cumulative Probability ◽  
Strain Capacity ◽  
Synthetic Fibers ◽  
Recent Advances ◽  
Tensile Strain Capacity

This paper summarizes recent advances in strain-hardening ultra-high-performance concretes (UHPC) with synthetic fibers, with emphasis on their tensile properties. The composites described here usually contain about 2.0% high-density polyethylene (PE) fibers. Compared to UHPC with steel fibers, strain-hardening UHPC with synthetic fibers generally show a higher tensile ductility, lower modulus in the cracked state, and relatively lower compressive strength. The tensile strain capacity of strain-hardening UHPC with synthetic fibers increases with increasing tensile strength. The f’cftεt/w index (compressive strength × tensile strength × tensile strain capacity/tensile crack width) is used to compare the overall performance of strain-hardening UHPC. Moreover, a probabilistic approach is applied to model the crack width distributions of strain-hardening UHPC, and estimate the critical tensile strain in practical applications, given a specific crack width limit and cumulative probability. Recent development on strain-hardening UHPC with the use of seawater, sea-sand and PE fibers are also presented.

Effect of Fiber Type and Fiber Hybrids on Strain-Hardening and Multiple Cracking Properties of the Ultra-High Performance Cementitious Composites under Uniaxial Loads

2016 ◽  
Vol 711 ◽  
pp. 187-194 ◽  
Author(s):  
Li Ping Guo ◽  
Dong Yi Lei
Keyword(s):  
Tensile Strength ◽  
Strain Hardening ◽  
High Performance ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Uniaxial Tensile ◽  
Cementitious Composites ◽  
Multiple Cracking ◽  
Polyethylene Fiber ◽  
Pva Fiber

Five series of strain hardening ultra-high performance cementitious composites (SHUHPCC) incorporated with different types of fibers and hybrid fibers were produced. Three types of fibers (steel fiber, polyvinyl alcohol fiber and polyethylene fiber) were used as mono or hybrid reinforcement in SHUHPCC with the same volume fraction of 2%. The primary strengths, strain hardening and multiple cracking behaviors of hybrid fiber reinforced SHUHPCC under the uniaxial tensile are investigated. Test results show that the SHUHPCC containing PE fibers exhibited higher strain hardening capacity and lower first cracking strength than composites reinforced with mono PVA fiber or mono steel fiber. The composites containing PVA fibers or steel fibers have higher tensile strength and first cracking strength than the composite reinforced by mono PE fiber. Hybridization reinforcement with different fibers is able to make up defects of mono fiber reinforcement for SHUHPCC. The change laws of tensile strength and uniaxial compression strength of SHUHPCC with mono PE fiber and mono PVA fiber are opposite to each other.

Engineered/strain-hardening cementitious composites (ECC/SHCC) with a compressive strength over 210 MPa

2021 ◽  
pp. 100775
Author(s):  
Bo-Tao Huang ◽  
Ke-Fan Weng ◽  
Ji-Xiang Zhu ◽  
Yu Xiang ◽  
Jian-Guo Dai ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Strain Hardening ◽  
Cementitious Composites ◽  
Engineered Strain

scholarly journals Use of Factory-Waste Shingles and Cement Kiln Dust to Enhance the Performance of Soil Used in Road Works

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Aly Ahmed ◽  
Medhat Shehata ◽  
Said Easa
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Capillary Rise ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Fine Grained Soil ◽  
Stabilized Soil ◽  
Cement Manufacturing ◽  
Kiln Dust

An experimental work was conducted to study the use of factory-waste roof shingles to enhance the properties of fine-grained soil used in road works. Cement kiln dust (CKD), a cogenerated product of Portland cement manufacturing, was used as a stabilizing agent while the processed shingles were added to enhance the soil tensile strength. The effects of shingles on strength and stability were evaluated using the unconfined compressive strength, splitting tensile strength, and California Bearing Ratio (CBR) tests. The results showed that the use of CKD alone resulted in a considerable increase in the unconfined compressive strength but had a small effect on the tensile strength. The addition of shingles substantially improved the tensile strength of the stabilized soil. A significant reduction in the capillary rise and a slight decrease in the permeability were obtained as a result of shingle addition. An optimal shingle content of 10% is recommended to stabilize the soil.

scholarly journals Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 83 ◽  
Author(s):  
Kamil Krzywiński ◽  
Łukasz Sadowski ◽  
Jacek Szymanowski ◽  
Andrzej Żak ◽  
Magdalena Piechówka-Mielnik
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Abrasion Resistance ◽  
Mechanical Performance ◽  
Reference Sample ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Cementitious Composites ◽  
Fluoride Nanoparticles

This article presents studies that were performed in order to improve the subsurface properties of horizontally-formed cementitious composites using tin(II) fluoride nanoparticles. The main aim of the study was to solve the problem of the decrease in subsurface properties caused by mortar bleeding and the segregation of the aggregate along the height of the overlay. The article also aims to highlight the patch grabbing difficulties that occur during the process of forming horizontally-formed cementitious composites. Four specimens were analyzed: one reference sample and three samples modified with the addition of 0.5, 1.0, and 1.5% of tin(II) fluoride nanoparticles in relation to the cement mass. To analyze the mechanical properties of the specimens, non-destructive (ultrasonic pulse velocity) and destructive tests (flexural tensile strength, compressive strength, abrasion resistance, pull-off strength) were performed. It was indicated that due to the addition of the tin(II) fluoride, it was possible to enhance the subsurface tensile strength and abrasion resistance of the tested cementitious composites. To confirm the obtained macroscopic results, the porosity of the subsurface was measured using SEM. It was also shown that the addition of the tin(II) fluoride nanoparticles did not reduce its flexural and compressive strength. The results show that horizontally-formed cementitious composites with the addition of 1.0% of tin(II) fluoride nanoparticles in relation to the cement mass obtained the most effective mechanical performance, especially with regard to subsurface properties.

scholarly journals Comparative Fracture Properties of Four Fibre Reinforced High Performance Cementitious Composites

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2612
Author(s):  
Piotr Smarzewski
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Fracture Energy ◽  
High Performance ◽  
Volume Fraction ◽  
Experimental Tests ◽  
Cementitious Composites ◽  
Basalt Fibre ◽  
Fracture Properties ◽  
Tensile Splitting Strength

This study investigates the fracture properties of high performance cementitious composites (HPCC) with four different types of fibres and with volume fraction content 3%. The four fibres are steel hooked end (S), polypropylene crimped (PP), basalt chopped (B), and glass (G) fibres. The tests were carried out in accordance with the RILEM recommendations. In order to examine the fresh properties of HPCC the slump flow tests were performed. Twelve fibre reinforced HPCC beam specimens with notch were cast and tested using central point loading experiments. In addition, experimental tests of the compressive strength and splitting tensile strength were carried out. The test results made it possible to obtain representative fracture parameters, such as the equivalent strengths, residual strengths, and fracture energy of fibre reinforced HPCC. The S fibre specimens showed the best performance in terms of workability, compressive strength, tensile splitting strength, and fracture energy at large deflection. On the other hand, G fibre specimens exhibited the best performance in terms of flexural strength, equivalent flexural strength at higher deflection, and residual flexural strength at lower deflection. In terms of equivalent flexural strength at lower deflection and residual flexural strength at higher deflection, basalt fibre specimens performed the best. On the contrary, polypropylene fibre reinforced beam specimens revealed the highest deflection capacity.

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