scholarly journals Investigation of the Mechanical, Microstructure and 3D Fractal Analysis of Nanocalcite-Modified Environmentally Friendly and Sustainable Cementitious Composites

Buildings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 36
Author(s):  
Mahmoud Ziada ◽  
Yosra Tammam ◽  
Savaş Erdem ◽  
Roberto Alonso González Lezcano
Keyword(s):  
Mechanical Properties ◽  
Fractal Analysis ◽  
Design Theory ◽  
Environmentally Friendly ◽  
Material Design ◽  
Pulse Velocity ◽  
Cementitious Composites ◽  
Microstructural Properties ◽  
Engineered Cementitious Composites ◽  
Conventional Concrete

Unlike conventional concrete materials, Engineered Cementitious Composites (ECC) use a micromechanics-based design theory in the material design process. Recently, the use of nanoparticles in various concretes and mortars has increased. This study used nanocalcite to investigate the mechanical, microstructural fractal analysis of environmentally friendly nanocalcite-doped ECC (NCa-ECC). This paper investigated the effects of nanocalcite (NCa) with different contents (0.5, 1, and 1.5% by mass of binder) on the mechanical properties of engineered cementitious composites (ECC). For this purpose, compressive strength, ultrasonic pulse velocity (UPV), and flexural strength tests were conducted to investigate the mechanical properties of the ECC series. In addition, SEM analyses were carried out to investigate the microstructural properties of the ECC series. The content of nanocalcite improved the mechanical and microstructural properties of the nanocalcite-modified ECC series. In addition, the 1 NCa series (1% nanocalcite modified to the mass of the binder) had the best performance among the series used in this study.

scholarly journals Test research on mechanical properties of engineered cementitious composites

2021 ◽  
Vol 647 ◽  
pp. 012071
Author(s):  
Shuaiyu Wang ◽  
Hongxiu Du ◽  
Jingjing Lv ◽  
Jun Guo ◽  
Guoyang Yue ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cementitious Composites ◽  
Engineered Cementitious Composites

Mechanical Properties of Modified Engineered Cementitious Composites (MECC) Incorporating Marble Dust

2021 ◽  
Vol 9 (8) ◽  
pp. 1140-1146
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Bottom Surface ◽  
Cementitious Composites ◽  
Strength Development ◽  
Shape Effect ◽  
Main Concern ◽  
Engineered Cementitious Composites ◽  
Flexure Strength ◽  
Marble Dust

Engineered cementitious composites (ECC) are a type of high-performance fiber reinforced cementitious composite. ECC has different applications in the construction field due to its inherent characteristics of high tensile strain. The main concern regarding ECC is its high cost. The content of cement is high contributing to its cost. In this research work, the cement in ECC is replaced with marble dust and its mechanical properties such as compressive strength and flexure strength have been assessed. For this purpose, both cubes and cylinders were tested at different test ages for finding the compressive strength development with time and observe the shape effect of specimens on the compressive strength of ECC mixes. Beam members were tested for finding the flexure strength of ECC mixes. Deflection gauge was also installed at the mid span on the bottom surface of the beams to find the maximum mid span deflection before failure. The compression test results of both cylinders and cubes revealed that using of marble dust has negative effect on the compressive strength of ECC. The flexure strength result showed that marble dust can be used up to some extent replacing cement will increase the flexure strength. The result of mid span deflection suggests that by incorporating marble dust in ECC, its ductility increases.

Effects of Gradation of Sand on the Mechanical Properties of Engineered Cementitious Composites

2011 ◽  
Vol 250-253 ◽  
pp. 374-378
Author(s):  
Ying Zi Yang ◽  
Yan Yao ◽  
Yu Zhu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Peak Load ◽  
Drying Shrinkage ◽  
Bending Test ◽  
Cementitious Composites ◽  
Paper Test ◽  
Engineered Cementitious Composites ◽  
Load Peak ◽  
Fineness Modulus

Four-point bending test was employed to investigate the effects of gradation of sand on the mechanical properties of Engineered Cementitious Composites (ECC). The characteristics of ECC such as mid-span deflection, first cracking load, peak load and fracture toughness were obtained from the load-deflection curve. Effects of gradation of sand on fresh properties, compressive strength, flexural strength and drying shrinkage of ECC were also discussed in this paper. Test results shown that when the fineness modulus of sand in ECC was 1.0, the mid-span deflection and fracture toughness of ECC increased nearly 1.5 times and 2 times that of ECC with the sand fineness modulus of 2.97, respectively. With the sand getting finer, the more superplascitizer is needed and the crack width of ECC becomes smaller. The drying shrinkage of ECC with 2.97 and 1.0 fineness modulus of sand at 24 days was 8×10-4 and 15.6×10-4, respectively.

scholarly journals Nano Alumina Based High Strength Concrete

2020 ◽  
Vol 9 (4) ◽  
pp. 256-363
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
High Strength ◽  
Pulse Velocity ◽  
Hardened Concrete ◽  
Normal Concrete ◽  
Conventional Concrete ◽  
Tem Analysis ◽  
Strength Concrete ◽  
Nano Alumina

Very recently, the world of nano technology has initiated to fabricate new materials owing to the demand for their use in enhancing the properties of different materials in general and, materials used in the construction industry in particular. In this study, the results of an exhaustive experimental analysis, on the use of nano alumina with cement powder to enhance the grade and strength of concrete has been undertaken. The influence of the nano alumina in concrete with different proportions has been studied to assess mechanical properties of concrete with reference to normal concrete. The test results indicate that the use of nano alumina in concrete has enhanced the mechanical properties of hardened concrete. This nano alumina based high strength concrete (HSC) has an enhanced compressive strength of 64.17 N/mm2 (MPa) after 28 days, which is a significant improvement over normal concrete. All the mixes having nano alumina in different proportions gave better results as compared to normal conventional concrete mix. The Rebound Hammer, Ultrasonic Pulse Velocity, SEM and TEM analysis further validate the above findings.

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