The Effect of Adding Selected Nanoparticles on the Mechanical Properties of the Cement Matrix of Self-Compacting Concrete

2015 ◽  
Vol 797 ◽  
pp. 158-165 ◽  
Author(s):  
Paweł Niewiadomski ◽  
Damian Stefaniuk
Keyword(s):  
Mechanical Properties ◽  
Cement Matrix ◽  
Test Results ◽  
Reference Series ◽  
Self Compacting Concrete

The interest in nanomaterials as an addition that improves the properties of concrete has been growing for more than a decade. One of the principal ways of evaluating concretes is the testing of their micro- and nanohardness by means of nanoindentation. This paper presents the results of nanoindentation tests of hardened self-compacting concrete modified with different amounts of nanoparticles. The investigations covered a reference series of self-compacting concrete without any nanoparticle addition and ten concrete series modified with different amounts of SiO2, TiO2and Al2O3powder nanoparticles. An analysis of the test results is carried out and conclusions are drawn.

The Effect of Polypropylene Fiber on the Mechanical Properties of Self-Compacting Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 1325-1329
Author(s):  
Ye Ran Zhu ◽  
Jun Cai ◽  
Dong Wang ◽  
Guo Hong Huang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Polypropylene Fiber ◽  
Flexural Properties ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Bending Tests ◽  
Flexural Toughness ◽  
Four Point Bending

This paper investigates the mechanical properties (compressive strength, splitting tensile strength and flexural toughness) of polypropylene fiber reinforced self-compacting concrete (PFRSCC). The effect of the incorporation of polypropylene fiber on the mechanical properties of PFRSCC is determined. Four point bending tests on beam specimens were performed to evaluate the flexural properties of PFRSCC. Test results indicate that flexural toughness and ductility are remarkably improved by the addition of polypropylene fiber.

scholarly journals Creep Assessment of the Cement Matrix of Self-Compacting Concrete Modified with the Addition of Nanoparticles Using the Indentation Method

2020 ◽  
Vol 10 (7) ◽  
pp. 2442
Author(s):  
Paweł Niewiadomski ◽  
Damian Stefaniuk
Keyword(s):  
Cement Matrix ◽  
Knowledge Gap ◽  
Al2o3 Nanoparticles ◽  
Cement Composites ◽  
Mechanical Parameters ◽  
Reference Series ◽  
Self Compacting Concrete ◽  
Indentation Method ◽  
Multi Scale ◽  
Creep Coefficient

In recent years, there has been an increased interest in the modification of cement composites with finer materials, including nanoparticles. Multi-scale studies are needed to fully assess the effect of nanoparticles and provide a complete overview of their impact on both the structure of an obtained material and its important mechanical parameters, such as creep. Therefore, the purpose of this paper is to fill the knowledge gap in the literature concerning the assessment of the creep of a cement matrix of self-compacting concrete modified with the addition of SiO2, TiO2, and Al2O3 nanoparticles using the indentation method. Depending on the type of used nanoparticles, we found an increase or decrease of the creep coefficient CIT in comparison to the reference series. The obtained results were scrupulously analyzed in terms of statistics, which enabled the conclusion that the addition of nanoparticles does not significantly affect the creep of the cement matrix of self-compacting concrete. The methodology used in this paper allowed us to shorten the time needed to assess the creep phenomenon compared to traditional methods and fill the corresponding knowledge gap in the literature.

Long Age Mechanical Properties and Application of Self-Compacting Concrete

2011 ◽  
Vol 224 ◽  
pp. 142-146 ◽  
Author(s):  
Chuan Qing Fu ◽  
Xian Yu Jin ◽  
Nan Guo Jin ◽  
Yi Bing Zhao ◽  
Fan Ge
Keyword(s):  
Mechanical Properties ◽  
Nuclear Power Station ◽  
Work Ability ◽  
Nuclear Power ◽  
Test Results ◽  
Power Station ◽  
Self Compacting Concrete ◽  
Under Construction

According to the need of a nuclear power station under construction, the preparation of C35, C50 self-compacting concrete(SCC) and their long age mechanics experiment were carried on. The test results between SCC and the vibrating concrete were compared. The test results indicated that the work ability and mechanical properties of SCC can satisfy the nuclear power station project. The long age mechanical properties were corresponding to the ones of vibrating concrete. The test results can be a reference of SCC research.

scholarly journals Design and predicting performance of carbon nanotube reinforced cementitious materials : mechanical properties and dipersion characteristics.

2020 ◽  
Author(s):  
Mahyar Ramezani
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Aspect Ratio ◽  
Flexural Strength ◽  
Experimental Test ◽  
Cementitious Materials ◽  
Matrix Composition ◽  
Cement Matrix ◽  
Test Results ◽  
Cement Ratio

Recently, Carbon Nanotubes (CNTs) are drawing considerable attention of researchers for reinforcing cementitious materials due to their excellent mechanical properties and high aspect ratio (length-to-diameter ratio). However, CNTs might not disperse well within the cement matrix, resulting in little improvement or even degradation of concrete properties. The uncertainty in producing the consistent results in different studies might be attributed to multiple interactions between the experimental variables affecting the nanotube dispersion and the final properties of CNT-cement nanocomposites. Therefore, this research mainly focused on proposing equations that can reliably capture these interactions in order to correlate CNT dispersion with the mechanical properties. The main experimental variables studied included CNT concentration, aspect ratio, ultrasonication energy, ultrasonication amplitude, surfactant-to-CNTs ratio, water-to-cement ratio, sand-to-cement ratio, and hydration age of specimen. The study reported in this research was conducted in two parts: experimental program and modeling. In the experimental part of this research, a total of 63 different mix proportions were used to evaluate the flowability, mechanical properties, and durability characteristics of cement pastes and mortars containing CNTs. Using experimental test results reported in this study and the literature, three critical relations were proposed to consider the CNT dispersion, cement matrix composition, and hydration age of cement. The proposed critical relations were then added to available theoretical models in the literature. The flexural strength and elastic modulus of CNT-cement nanocomposites were predicted through a state-of-the-art probabilistic model using a Bayesian methodology. Finally, the developed probabilistic models were used to identify the optimum ranges of the experimental variables to maximize the mechanical properties. This was done through computing the conditional probability of not meeting the specified design requirement. The experimental results indicated that addition of CNTs could significantly improve different properties of cementitious materials, if the optimum range of each variable was used. Also, to achieve the desired mechanical properties, various combinations of the experimental variables might be used. The proposed prediction models were shown to capture the interactions between the experimental variables for predicting the mechanical properties within ±15% and ±18% of the experimental test results for flexural strength and elastic modulus, respectively. Based on the findings of this research, contour plots were developed to provide practical guidelines for future engineers to design CNT-cement nanocomposites.

scholarly journals Performance evaluation of mechanical properties of self-compacting concrete using artificial neural network

2020 ◽  
Vol 9 (1) ◽  
pp. 104
Author(s):  
Arabi N.S.Al qadi ◽  
Madhar Haddad
Keyword(s):  
Neural Network ◽  
Mechanical Properties ◽  
Mineral Admixtures ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Predictive Capacity ◽  
Aggre Gate ◽  
The Neural Network ◽  
Hardened Properties ◽  
Local Materials

This experimental study was undertaken to investigate the effects of using local materials (cement, fly ash, super-plasticizer, coarse aggre-gate, and sand) on the mechanical properties of Self-Compacting Concrete (SCC). For this purpose, a total of 31 mixtures of SCC were prepared by the neural network design methods. Furthermore, based on the experimental results, the neural network model-based clear for-mulations were developed to predict the mechanical properties of SCC. The test results have shown that mineral admixtures were very effective on hardened properties of SCC. In addition, it was found that the developed model by using neural network appeared to have a high predictive capacity of hardened properties of SCC with respect to regression and experimental.  

scholarly journals Study some mechanical properties of self-compacting concrete with nano silica under severe saline environment conditions

2018 ◽  
Vol 162 ◽  
pp. 02015
Author(s):  
Ghalib Habeeb ◽  
Zahraa Hashim
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Pulse Velocity ◽  
Cementitious Materials ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Test Results ◽  
Nano Silica ◽  
Self Compacting Concrete ◽  
Static Modulus ◽  
Static Modulus Of Elasticity

The main aim of this research is to evaluate the performance of Nano silica self-compacting concrete which is subjected to severe saline conditions that contain sulfates and chlorides at concentrations similar to those existing in the soils and ground water of the middle and southern parts of Iraq. For this purpose, ordinary and sulfate resistant Portland cement without and with 3% Nano silica addition by weight of cementitious materials were used. Splitting tensile strength, flexural strength, static modulus of elasticity and ultrasonic pulse velocity were investigated for all exposure conditions and all types of mixes of self-compacting concrete at ages of 28, 60, 90, 120 and 180 days. Test results revealed that the inclusion of Nano Silica in concrete mixes improved clearly the mechanical properties of self-compacting concrete compared with reference concrete.

scholarly journals Study of the Effect of Plastic Waste Fibers Incorporation on the Behavior of Self Compacting Concrete

2021 ◽  
Vol 45 (5) ◽  
pp. 417-421
Author(s):  
Laid Baali ◽  
Larbi Belagraa ◽  
Mohamed Aziz Chikouche ◽  
Leila Zeghichi
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Physical And Mechanical Properties ◽  
Plastic Waste ◽  
Ductile Material ◽  
Cement Matrix ◽  
Self Compacting Concrete ◽  
Mechanical Responses ◽  
Hard State ◽  
The Stability

The use of waste and by-products has been for many decades for the manufacturing of building materials such as concrete and mortars. That responds simultaneously to reasons of economy of natural resources in aggregates (C&D waste) and the possibility of recovering industrial waste additions as replacement in composites. The present study focuses on the use of plastic waste fibers embedded in the cement matrix of self-compacting concrete SCC to improve its properties, either rheological mainly, the stability at fresh state or mechanical responses such as compressive and tensile strengths at hard state. This incorporation of plastic fiber reinforcement on the structure matrix could result an alternative SCC composite as a ductile material with enhanced properties. In this context, the self-compacting composites by adding a variable percentage of plastic fibers at 0.5, 1, 1.5% is formulated. Hence, the effect of plastic fibers waste on the rheological and mechanical properties of SCC is assessed. The obtained results in the present study let us to conclude the beneficial effect of such inclusion of plastic fibers on this new confected SCC fiber composition with acceptable rheological, physical and mechanical properties compared to those of a normal SCC concrete.

scholarly journals Pengaruh Metode Self Compacting Concrete (Scc) Terhadap Sifat Mekanis Beton

2021 ◽  
Vol 6 (1) ◽  
pp. 32
Author(s):  
Abdul Karim Hadi ◽  
Sudarman Supardi ◽  
Mukti Maruddin ◽  
A.Alal Azhari Yusuf ◽  
Rahmat Hidayat Samsuddin
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Self Compacting Concrete ◽  
Normal Concrete ◽  
Split Tensile Strength ◽  
High Rise ◽  
Strength Based

Dalam dunia konstruksi pekerjaan beton memegang peranan sangat penting, baik pada bangunan struktural maupun non struktural.Dapat dilihat bahwahampir setiap bangunan yang didirikanseperti perumahan, gedung bertingkat, jembatan, jalan,  bendungan dan saluran irigasi serta bangunan lainnya selalu  memerlukan adanya pekerjaan betonterutama pada pekerjaan konstruksi beton bertulang. Selama ini pemadatan atau vibrasi dilakukan tidak sesuai dengan prosedur dan dapat menurunkan kualitas beton. Salah satu solusi mengatasi masalah tersebut yaitu dengan penggunaan self compacting concrete.Tujuan penelitian ini untuk mengetahui pengaruh penambahan superplasticizerterhadap workabilitybeton self compacting concretedan untuk mengetahui pengaruh metode self compacting concreteterhadap sifat mekanis beton. Penelitian dilakukan di laboratorium struktur dan bahan dengan penggunaan superplasticizertype sika-viscocrete 3115N sebanyak 2% dari berat semen. Pembuatan job mix designdibuat dengan metode SNI. Berdasarkan hasil penelitian superplasticizerdapat meningkatkan workabilitypada beton segar. Hasil pengujian slump cone test pada beton normal sebesar 8 cm, sedangkan hasil slump flowpada beton self compacting concretesebesar 75 cm. Pada penelitian ini didapatkan nilai kuat tekan beton normal sebesar 25,096 Mpa dan nilai kuat tekan beton SCC sebesar 30,264 Mpa dari mutu rencana 25 Mpa dan nilai kuat tarik belah beton normal sebesar 2,343 Mpa atau 9,340% dari nilai kuat tekan dan nilai kuat tarik belah beton SCC sebesar 3,358 Mpa atau 11,09%  dari nilai kuat tekan. Berdasarkan data yang didapatkan self compacting concrete memilki workabilitydan sifat mekanis yang lebih baik.   In the world of construction, concrete work plays a very important role, both in structural and non-structural buildings. It can be seen that almost every building that is erected such as housing, high rise buildings, bridges, roads, dams and irrigation canals and other buildings always requires concrete work, especially in reinforced concrete construction work. During this time compaction or vibration is done not in accordance with procedures and can reduce the quality of concrete. One solution to overcome this problem is the use of self compacting concrete. The purpose of this study was to determine the effect of adding superplasticizer to the workability of self compacting concrete and to determine the effect of the self compacting concrete method on the mechanical properties of concrete. The research was carried out in the structure and material laboratory using 2% sika-viscocrete superplasticizer as much as 2% by weight of cement. Job mix design is made using SNI method. Based on the results of research superplasticizer can increase workability in fresh concrete. The slump cone test results on normal concrete are 8 cm, while the slump flow results on self-compacting concrete are 75 cm. In this study, the compressive strength value of normal concrete was 25.096 MPa and the compressive strength value of SCC concrete was 30.264 MPa from the quality plan of 25 MPa and the value of normal concrete split tensile strength was 2.334 MPa or 9.340% of the compressive strength and SCC concrete compressive strength value. 3.358 MPa or 11.09% of the compressive strength. Based on the data obtained, self compacting concrete has better workability and mechanical properties

scholarly journals Mechanical properties and durability assessment of nylon fiber reinforced self-compacting concrete

2021 ◽  
Vol 16 ◽  
pp. 155892502110628
Author(s):  
Jawad Ahmad ◽  
Osama Zaid ◽  
Fahid Aslam ◽  
Rebeca Martínez-García ◽  
Yasir M. Elharthi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Negative Impact ◽  
Research Work ◽  
Mechanical Tests ◽  
Absorption Capacity ◽  
Test Results ◽  
Acid Attack ◽  
Self Compacting Concrete ◽  
Filling Ability ◽  
Durability Assessment

The higher paste volume in Self Compacting Concrete (SCC) makes it susceptible to have a higher creep coefficient and cracking and has brittle nature. This brittle nature of concrete is unacceptable for any construction industry. The addition of fibers is one of the most prevalent methods to enhance the ductile and tensile behavior of concrete. Fibers reduce the cracking phenomena and improve the energy absorption capacity of the structure. Conversely, the addition of fibers has a negative impact on the workability of fresh concrete. In this research work, a detailed investigation of the influence of Nylon fibers (NFs) on fresh properties, durability, and mechanical properties of SCC was carried out. NFs were added into concrete mixes in a proportion of 0.5%, 1%, 1.5%, and 2% by weight of cement to achieve the research objectives. Durability assessment of modified SCC having Nylon fibers was performed using water absorption, permeability, carbonation resistance, and acid attack resistant. Mechanical tests (compressive and tensile) were conducted for modified as well as control mix. Test results indicate that the passing and filling ability decreased while segregation and bleeding resistance increased with NFs. Furthermore, test results showed a significant increase in strength up to 1.5% addition of nylon fibers and then strength decreases gradually. Durability parameters were significantly improved with the incorporation of NFs relative to the control mix. Overall, this study demonstrated the potential of using nylon fibers in self-compacting concrete with improved durability and mechanical properties.

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