The Experts below are selected from a list of 8409 Experts worldwide ranked by ideXlab platform

Mahsa Modiri Gharehveran - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of the Splitting Tensile Strength in plain and steel fiber reinforced concrete based on the compressive Strength
    Construction and Building Materials, 2015
    Co-Authors: Ali Behnood, Kho Pin Verian, Mahsa Modiri Gharehveran
    Abstract:

    Abstract Compressive Strength (fc) and Splitting Tensile Strength (fspt) of concrete are two important parameters in structural design. Due to the complexity, cost, and time-consuming nature of performing Tensile tests, many researchers are interested to predict the value of this property in a simplified but accurate manner. This paper presents non-linear regression (NLR) analysis, artificial neural network (ANN), support vector machine (SVM) and M5′ model tree (MT) techniques to predict the Tensile Strength (fspt) of concretes made with and without steel fiber reinforcement. Error measures were used to compare the performance of different models including the models developed in this study and those developed by other researchers. Results indicated that non-linear regression analysis, artificial neural network, support vector machine, and model tree algorithms can predict the Splitting Tensile Strength of concretes made with and without steel fiber reinforcement with satisfactory accuracy. However, machine learning techniques such as ANN, M5′ model tree and SVM provided superior models compared to NLR analysis.

Ali Behnood - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of the Splitting Tensile Strength in plain and steel fiber reinforced concrete based on the compressive Strength
    Construction and Building Materials, 2015
    Co-Authors: Ali Behnood, Kho Pin Verian, Mahsa Modiri Gharehveran
    Abstract:

    Abstract Compressive Strength (fc) and Splitting Tensile Strength (fspt) of concrete are two important parameters in structural design. Due to the complexity, cost, and time-consuming nature of performing Tensile tests, many researchers are interested to predict the value of this property in a simplified but accurate manner. This paper presents non-linear regression (NLR) analysis, artificial neural network (ANN), support vector machine (SVM) and M5′ model tree (MT) techniques to predict the Tensile Strength (fspt) of concretes made with and without steel fiber reinforcement. Error measures were used to compare the performance of different models including the models developed in this study and those developed by other researchers. Results indicated that non-linear regression analysis, artificial neural network, support vector machine, and model tree algorithms can predict the Splitting Tensile Strength of concretes made with and without steel fiber reinforcement with satisfactory accuracy. However, machine learning techniques such as ANN, M5′ model tree and SVM provided superior models compared to NLR analysis.

  • comparison of compressive and Splitting Tensile Strength of high Strength concrete with and without polypropylene fibers heated to high temperatures
    Fire Safety Journal, 2009
    Co-Authors: Ali Behnood, Masoud Ghandehari
    Abstract:

    Abstract This paper presents the results of an extensive experimental study on the compressive and Splitting Tensile Strength of high-Strength concrete with and without polypropylene (PP) fibers after heating to 600 °C. Mixtures were prepared with water to cementitious materials ratios of 0.40, 0.35, and 0.30 containing silica fume at 0%, 6%, and 10% cement replacement and polypropylene fibers content of 0, 1, 2, and 3 kg/m3. A severe Strength loss was observed for all of the concretes after exposure to 600 °C, particularly the concretes containing silica fume despite their good mechanical properties at room temperature. The range of 300–600 °C was more critical for concrete having higher Strength. The relative compressive Strengths of concretes containing PP fibers were higher than those of concretes without PP fibers. The Splitting Tensile Strength of concrete was more sensitive to high temperatures than the compressive Strength. Furthermore, the presence of PP fibers was more effective for compressive Strength than Splitting Tensile Strength above 200 °C. Based on the test results, it can be concluded that the addition of 2 kg/m3 PP fibers can significantly promote the residual mechanical properties of HSC during heating.

Keda C Irid - One of the best experts on this subject based on the ideXlab platform.

  • an equation to evaluate the unconfined compressive Strength of rock from Splitting Tensile Strength test results
    Geotechnical and Geological Engineering, 2016
    Co-Authors: Keda C Irid
    Abstract:

    The unconfined compressive Strength (UCS) of rock is a basic parameter for the design of foundations resting on rock. However, it is often very difficult to retrieve intact rock core specimens for the UCS test due to mechanical breaking or natural fracturing of the rock core during the drilling process. In such cases, it becomes obligatory to correlate UCS values based on the point load Strength index test results. Correlation between the UCS and the point load Strength index test results has been observed to be inconsistent in many instances and hence a need for another such correlation with a relatively higher degree of accuracy to predict UCS values of rock sample has been generated. An endeavor has been made to correlate the UCS value based on the test results of a Splitting Tensile Strength test (STS) by conducting both the tests on various rock samples. Though the UCS test provides compressive Strength and the STS test provides Tensile Strength of a rock, a dimensional analysis technique has been used to correlate these properties. The predicted UCS results are compared with the actual lab UCS test results to validate the mathematical equation thus developed. It has been observed from comparison that this equation can be used to predict UCS values from STS results with a fair degree of accuracy. Thus the Dimensional analysis has established a provisional rule-of-thumb to correlate the UCS with STS test results and further proved that, it is an easy and sufficiently accurate analytical tool.

Hao Bo Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Splitting Tensile Strength of Concrete Under Temperature Differences
    DEStech Transactions on Materials Science and Engineering, 2017
    Co-Authors: Yan Zhang, Hao Bo Zhang
    Abstract:

    The concrete shotcrete layer of the tunnel in the high-temperature field during construction exist in significant temperature difference environment caused by the one side of the shotcrete layer in contact with higher temperature rock, and the other side is in contact with the lower temperature air. Stress deterioration degree of concrete under the temperature difference condition comes out and it whether to produce local cracks in concrete is unknown clearly in engineering. According to the site concrete loading case conditions, the lab Splitting Tensile Strength testing study of 4 types of concrete samples experiencing temperature differences is made. Through the results of the concrete test, a temperature difference influencing law of the concrete Strength under temperature differences condition has been initially collected. And the results can provide a reference for similar projects.

  • Study on Splitting Tensile Strength of Shotcret Layer of High Temperature Tunnel
    Advanced Materials Research, 2012
    Co-Authors: Yan Zhang, Hao Bo Zhang
    Abstract:

    The high-temperature tunnel at Buren mouth - kongur Hydropower in West Kunlun Mountains of Xinjiang, China exist significant temperature differences phenomenon, which affects the stability of the shotcrete layer in tunnel. Combining with on-site engineering practice, the insulation heating device is designed. The laboratory Splitting Tensile Strength test is carried out on polyester concrete, polypropylene concrete, polyacrylonitrile concrete and ordinary concrete with thermal heating device at 25°C-90°C. The Splitting Tensile Strength changes of concretes affected by temperature difference are analyzed. The results supply a directly guidance to the design of the concrete sprayed layer structure of high-temperature tunnel.

Ju Zhang - One of the best experts on this subject based on the ideXlab platform.

  • compressive Strength and Splitting Tensile Strength of steel fiber reinforced ultra high Strength concrete sfrc
    Applied Mechanics and Materials, 2010
    Co-Authors: Ju Zhang
    Abstract:

    This paper investigates the compressive Strength and Splitting Tensile Strength of ultra high Strength concrete containing steel fiber. The steel fibers were added at the volume fractions of 0%, 0.5%, 0.75%, 1.0% and 1.5%. The compressive Strength of the steel fiber reinforced ultra high Strength concrete (SFRC) reached a maximum at 0.75% volume fraction, being a 15.5% improvement over the UHSC. The Splitting Tensile Strength of the SFRC improved with increasing the volume fraction, achieving 91.9% improvements at 1.5% volume fraction. Strength models were established to predict the compressive and Splitting Tensile Strengths of the SFRC. The models give predictions matching the measurements. Conclusions can be drawn that the marked brittleness with low Tensile Strength and strain capacities of ultra high Strength concrete (UHSC) can be overcome by the addition of steel fibers.

  • Compressive Strength and Splitting Tensile Strength of Polyvinyl Alcohol Fiber Reinforced Ultra High Strength Concrete (PFRC)
    Advanced Materials Research, 2010
    Co-Authors: Chang Wang Yan, Ju Zhang, Jin Qing Jia, Rui Jiang
    Abstract:

    The marked brittleness with low Tensile Strength and strain capacities of ultra high Strength concrete (UHSC) with compressive Strength of 100 MPa can be overcome by the addition of polyvinyl alcohol (PVA) fibers. The compressive Strength and Splitting Tensile Strength of ultra high Strength concrete containing PVA fibers are investigated this paper. The PVA fibers were added at the volume fractions of 0%, 0.17%, 0.25%, 0.34% and 0.5%. The compressive Strength of the PVA fiber reinforced ultra high Strength concrete (PFRC) reached a maximum at 0.5% volume fraction, being an 8.2% improvement over the UHSC. The Splitting Tensile Strength of the PFRC improved with increasing the volume fraction, achieving 46.7% improvements at 0.5% volume fraction. The Splitting Strength models were established to predict the compressive and Splitting Tensile Strengths of the PFRC. The models give predictions matching the measurements.