Application of Inorganic Cohesive Glue in Concrete Repair

2010 ◽  
Vol 168-170 ◽  
pp. 945-948
Author(s):  
Shu Hua Liu
Keyword(s):  
High Strength Concrete ◽  
Mechanical Performance ◽  
High Strength ◽  
Concrete Repair ◽  
Repair Work ◽  
Strength Concrete ◽  
Original Specimen ◽  
Better Than

The properties of inorganic cohesive glue and its appliance to repairing ordinary and high strength concrete were studied in this paper. Inorganic cohesive glue not only has high strength, but also has equivalent coefficient of expansion with that of concrete and steel. The mechanical performance of inorganic cohesive glue is better than that of concrete, and other performances are similar to those of concrete. In the concrete repair work, it can mend the ruinate concrete well, and the strength of the repaired concrete is as high as or higher than that of original specimen.

Experimental Research on Physical and Mechanical Properties of Steel Fiber High-Strength Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 1061-1064 ◽  
Author(s):  
Yu Dong Wang ◽  
Xiao Chun Fan
Keyword(s):  
High Strength Concrete ◽  
Bending Strength ◽  
Steel Fiber ◽  
Mechanical Performance ◽  
Physical And Mechanical Properties ◽  
Drying Shrinkage ◽  
High Strength ◽  
Engineering Practice ◽  
Strength Concrete ◽  
Mix Proportion

Based on experiment, the mix proportion matching with the design and construction requirements is obtained. It meets with the requirement of pump structure on the basis of meeting the strength requirement. On this basis, the basic physical and mechanical performance is studied and the conclusion is that steel fiber high-strength concrete has excellent resistance to splitting, bending and drying shrinkage. The splitting strength and bending strength of steel fiber high-strength concrete named CF60-2 is respectively 38.7% and 56.8% higher than that of plane concrete named C60. The drying shrinkage rate of CF60-2 is 45.5% lower than that of C60 in three days. The results have an important guiding significance to steel fiber high-strength concrete in theoretical and engineering practice.

scholarly journals Study on Mix Proportion Optimization of C50 High Strength Concrete

2021 ◽  
Vol 2101 (1) ◽  
pp. 012068
Author(s):  
Yunhua Wang ◽  
Fanji Cai ◽  
Qiong Wang ◽  
Dongfeng Li ◽  
Pan Guo
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
Mechanical Performance ◽  
High Strength ◽  
Economic Costs ◽  
Engineering Technology ◽  
Strength Concrete ◽  
Mix Proportion ◽  
C 50 ◽  
Selection Of

Abstract With the progress of engineering technology, C50 high-strength coagulation came into being for the needs of actual engineering. This research mainly focuses on the selection of cement varieties and admixtures of C 50 high-strength concrete, so as to realize the optimization research of the mix ratio of C 50 high-strength concrete. The results show that ordinary P.O 42.5 and fly ash admixture can increase the mechanical performance of concrete. However, the concrete compressive strength with the mixed admixture of fly ash and mineral powder is even lower than that without any admixture. On the premise of meeting actual engineering needs, the optimization of the mix ratio of high-strength concrete can not only achieve sustainable development, but also save investment in project economic costs.

scholarly journals Effects of Plastic Waste on the Heat-Induced Spalling Performance and Mechanical Properties of High Strength Concrete

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3262
Author(s):  
Abrahão Bernardo Rohden ◽  
Jessica Regina Camilo ◽  
Rafaela Cristina Amaral ◽  
Estela Oliari Garcez ◽  
Mônica Regina Garcez
Keyword(s):  
Mechanical Properties ◽  
High Strength Concrete ◽  
Mechanical Performance ◽  
High Strength ◽  
Plastic Waste ◽  
Polypropylene Fibers ◽  
Strength Concrete ◽  
Polymer Melting ◽  
Computed Tomography Images ◽  
X Ray Computed

This paper investigates a potential application of hard-to-recycle plastic waste as polymeric addition in high strength concrete, with a focus on the potential to mitigate heat-induced concrete spalling and the consequent effects on the mechanical properties. The waste corresponds to soft and hard plastic, including household polymers vastly disposed of in landfills, although technically recyclable. Mechanical and physical properties, cracking, mass loss, and the occurrence of spalling were assessed in high strength concrete samples produced with either plastic waste or polypropylene fibers after 2-h exposure to 600 °C. The analysis was supported by Scanning Electron Microscopy and X-Ray Computed Tomography images. The plastic waste is composed of different polymers with a thermal degradation between 250 to 500 °C. Polypropylene (PP) fibers and plastic waste dispersed in concrete have proved to play an essential role in mitigating heat-induced concrete spalling, contributing to the release of internal pressure after the polymer melting. The different morphology of plastic waste and polypropylene fibers leads to distinct mechanisms of action. While the vapor pressure dissipation network originated by polypropylene fibers is related to the formation of continuous channels, the plastic waste seems to cause discontinuous reservoirs and fewer damages into the concrete matrix. The incorporation of plastic waste improved heat-induced concrete spalling performance. While 6 kg/m3 of plastic increased the mechanical performance after exposure to high temperature, the incorporation of 3 kg/m3 resulted in mechanical properties comparable to the reference concrete.

scholarly journals Mechanical Performance Prediction for Sustainable High-Strength Concrete Using Bio-Inspired Neural Network

Buildings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 65
Author(s):  
Junbo Sun ◽  
Jiaqing Wang ◽  
Zhaoyue Zhu ◽  
Rui He ◽  
Cheng Peng ◽  
...  
Keyword(s):  
Neural Network ◽  
High Strength Concrete ◽  
Prediction Accuracy ◽  
Mechanical Performance ◽  
Back Propagation ◽  
High Strength ◽  
Mix Design ◽  
Strength Concrete ◽  
Laboratory Test Results ◽  
Bpnn Model

High-strength concrete (HSC) is a functional material possessing superior mechanical performance and considerable durability, which has been widely used in long-span bridges and high-rise buildings. Unconfined compressive strength (UCS) is one of the most crucial parameters for evaluating HSC performance. Previously, the mix design of HSC is based on the laboratory test results which is time and money consuming. Nowadays, the UCS can be predicted based on the existing database to guide the mix design with the development of machine learning (ML) such as back-propagation neural network (BPNN). However, the BPNN’s hyperparameters (the number of hidden layers, the number of neurons in each layer), which is commonly adjusted by the traditional trial and error method, usually influence the prediction accuracy. Therefore, in this study, BPNN is utilised to predict the UCS of HSC with the hyperparameters tuned by a bio-inspired beetle antennae search (BAS) algorithm. The database is established based on the results of 324 HSC samples from previous literature. The established BAS-BPNN model possesses excellent prediction reliability and accuracy as shown in the high correlation coefficient (R = 0.9893) and low Root-mean-square error (RMSE = 1.5158 MPa). By introducing the BAS algorithm, the prediction process can be totally automatical since the optimal hyperparameters of BPNN are obtained automatically. The established BPNN model has the benefit of being applied in practice to support the HSC mix design. In addition, sensitivity analysis is conducted to investigate the significance of input variables. Cement content is proved to influence the UCS most significantly while superplasticizer content has the least significance. However, owing to the dataset limitation and limited performance of ML models which affect the UCS prediction accuracy, further data collection and model update must be implemented.

scholarly journals Prediction of the Mechanical Performance of High-Strength Concrete Containing Biomedical Polymeric Waste Obtained from Dialysis Treatment

2021 ◽  
Vol 11 (5) ◽  
pp. 2053
Author(s):  
Saman Rahimireskati ◽  
Kazem Ghabraie ◽  
Estela Oliari Garcez ◽  
Riyadh Al-Ameri
Keyword(s):  
High Strength Concrete ◽  
Prediction Models ◽  
Mechanical Performance ◽  
High Strength ◽  
Hardened Concrete ◽  
Dialysis Treatment ◽  
Strength Concrete ◽  
Concrete Mix Design ◽  
Waste Separation ◽  
Polymeric Waste

Since between 1.5 and 8 kg (400 kg/patient/year) of biomedical polymeric waste (BPW) is usually discarded by landfilling or combusting after each dialysis treatment, this study provides evidence for safe and environment-friendly utilisation of BPW, sourced from dialysis treatment and donated by the health and industrial partners, by incorporating it in high-strength concrete. Moreover, the paper aims to provide engineers, designers, and the construction industry with information regarding the mechanical performance of high-strength concrete containing BPW, and the susceptibility of the current international codes and standards on the prediction of the mechanical performance. A new concrete mix design incorporating BPW was proposed and verified by several trial mixes. Three Soft, Hard, and Hybrid BPW were added to the conventional high-strength concrete in different percentages ranging from 1.5% to 9% by weight of cement. Afterwards, the fresh and hardened concrete properties, namely slump, density, compressive strength, tensile strength, modulus of elasticity, and Scanning Electron Microscopy (SEM), were investigated, and existing prediction models were employed to verify their suitability for the new concrete. Generally, adding Hybrid BPW resulted in better mechanical performance than soft or hard BPW addition, while eliminating the waste separation phase. The results also showed that the mechanical performance of BPW-containing concrete is predictable by current codes, addressing possible engineering design limitations. New higher accuracy regression-based models were also proposed to reach better engineering interpretations.

scholarly journals Study of the Mechanical Performance of the Improved Multi-Layer Composites Under Drop Weight Impact Loads

2020 ◽  
Vol 20 (06) ◽  
pp. 2040002
Author(s):  
Saima Ali ◽  
Xuemei Liu ◽  
Sabrina Fawzia ◽  
David Thambiratnam
Keyword(s):  
Asphalt Concrete ◽  
High Strength Concrete ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Impact Resistance ◽  
High Strength ◽  
Impact Loads ◽  
Strength Concrete ◽  
Layer Composite ◽  
Maintenance Work

This study attempts to propose innovative multi-layer cement-based composites to have high impact resistance which could be used for runway. In this paper, the performances of two innovative multi-layer composite runway pavements using asphalt concrete-high strength concrete-cement-treated aggregate and asphalt concrete-high strength concrete-cement mortar in surface-base-subbase layer were evaluated under impact loads. ABAQUS/Explicit software was used to simulate loading condition and nonlinear stabilized runway pavement layers characteristics. In addition, a detailed parametric study was also carried out to explore the effects of the selected materials and load-related parameters in changing the performance of multi-layer composites. The findings of the study will be helpful to introduce protective multi-layer composite runway pavement and consequently to reduce the maintenance work of runway pavement.

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