scholarly journals Short-Term Deformation Model of High-Performance Concrete Plate Based on Surrounding Temperature

2021 ◽  
Vol 7 (2) ◽  
pp. 63-73
Author(s):  
Niken Chatarina ◽  
Keyword(s):  
Delay Time ◽  
High Performance ◽  
High Performance Concrete ◽  
Deformation Behaviour ◽  
Average Error ◽  
Deformation Model ◽  
Peak Time ◽  
Concrete Plate ◽  
Age Range ◽  
The Relationship

The relationship between surrounding temperature and deformation behaviour of one full scale concrete plate with compressive strength of 60 MPa was presented in this paper. This research was done in Indonesia. Indonesia presents humid tropical weather. A specimen measuring 3.00m × 1.60m × 0.15m was used. Deformation was obtained by using four embedded vibrating wire strain gauges. The range observation is held between 7 to 28 days. The peaks of deformation follow peaks of surrounding temperature. Some deformation peaks time occur after surrounding temperature peak time, it is called as delay time. As a result, there is a linear relationship between temperature and deformation. The relationship was influenced by a factor which presented its position and delay time. The average error of this model is less than 15% at the age range of 7 until 14 days, and less than 50% at the age range of 15 - 28 days.

Green High Performance Concrete Based on Sustainable Development

2014 ◽  
Vol 584-586 ◽  
pp. 1568-1572
Author(s):  
Ping Zhang ◽  
Ying Cao
Keyword(s):  
Sustainable Development ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Materials ◽  
Living Environment ◽  
The Sustainable Development ◽  
Green Concrete ◽  
Concrete Production ◽  
Concrete Materials ◽  
The Relationship

Green high performance concrete is concrete materials which can reduce the load of the earth's environment, coordinate development with the ecosystem and create comfortable living environment. The relationship between the construction materials and the sustainable development and the characteristic of green high performance concrete were introduced, the measures of green concrete production was analyzed and the work essential for the development of green high performance concrete was proposed in this paper. The research shows that the development of green high performance concrete is the inevitable way for the sustainable development of concrete.

Advances in Research on Correlation of Workability and Rheology of Fresh Concrete: A Review

2009 ◽  
Vol 405-406 ◽  
pp. 77-82
Author(s):  
Gai Fei Peng ◽  
Zhan Qi Guo ◽  
Piet Stroeven ◽  
Ri Gao ◽  
Guang Hua Huang
Keyword(s):  
Literature Review ◽  
High Performance ◽  
High Performance Concrete ◽  
Fresh Concrete ◽  
Experimental Tests ◽  
Test Method ◽  
Future Research ◽  
Specific Method ◽  
Self Compacting Concrete ◽  
The Relationship

A literature review was carried out to identify advances in research on workability of fresh concrete via both experimental tests and modeling, especially high performance concrete and self-compacting concrete. It is concluded that, in order to achieve better understanding of fresh concrete, especially self-compacting concrete (SCC) and high-performance concrete (HPC), a clear methodology of research should be established as the first step. It is suggested that there is no unique workability test method suitable for all the range of fluidity of fresh concrete, and a specific method should be identified for a proper range of fluidity. As to the relationship between fluidity of concrete and that of paste, future research can be conducted in two aspects, i.e. one is the influence of the quantity of paste in concrete, and another is the influence of fluidity of paste affected by a couple of factors.

Advances in Research on Influence of Raw Materials on Workability of Fresh Concrete: A Review

2009 ◽  
Vol 405-406 ◽  
pp. 83-88 ◽  
Author(s):  
Gai Fei Peng ◽  
Zhan Qi Guo ◽  
Piet Stroeven ◽  
Ri Gao ◽  
Jiu Feng Zhang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Fresh Concrete ◽  
Raw Materials ◽  
Experimental Tests ◽  
Solid Particles ◽  
Future Research ◽  
Negative Effect ◽  
The Relationship ◽  
Positive Effect

A literature review was carried out to identify advances in research on workability of fresh concrete via both experimental tests and modeling, especially high performance concrete and self-compacting concrete. As to the relationship between fluidity of concrete and that of paste, future research can be conducted in two aspects, i.e. one is the influence of the quantity of paste in concrete, and another is the influence of fluidity of paste affected by a couple of factors. Most literature proved that the flow of concrete depends both on positive effect and negative effect, the former promote fluidity, such as dispersing, filling and lubricating, and the latter restricts fluidity, such as formation of particle coagulation, an increase of wettable surface of solid particles and mechanical interlock.

scholarly journals Locally Produced UHPC: The Influence of Type and Content of Steel Fibres

2021 ◽  
Vol 64 (1) ◽  
pp. 31-52
Author(s):  
Ingrid Lande ◽  
Rein Terje Thorstensen
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Deformation Behaviour ◽  
Image Correlation ◽  
Material Strength ◽  
Content Type ◽  
Steel Fibres ◽  
Flexural Tensile Strength ◽  
Southern Norway

Abstract Ultra-high performance concrete might be a competitive alternative to normal concrete for some purposes. But despite research efforts during decades, utilisation is still not widespread. Reasons include limited competence and material availability. This paper presents one step of a research initiative aimed at facilitating the use of UHPC in Norway. The step presented here comprises the accumulated results from investigations on the influence steel fibres (content, type, and hybrid combination) have on material strength and deformation behaviour of locally produced UHPC, made with constituents found in southern Norway. 231 specimens were tested, spanning nine UHPC mixes. Digital Image Correlation (DIC) was successfully used to study crack propagation. Compressive strength of 166 MPa and E-modulus of 46 GPa were obtained, not being influenced by fibre content. The flexural tensile strength was found to be strongly dependent on variations in steel fibre properties and mix design. The highest flexural tensile strength was obtained for prisms with micro straight steel fibres alone, or in 50% combination with macro hooked-end fibres. The experimental results are considered in a theory-informed discussion. Suggestions are made on the use of steel fibres in locally produced UHPC, potentially lowering the cost by 30%.

scholarly journals A Pilot Study in Humans to Investigate the Relationship Between Circulating L-citrulline and Arginine After Watermelon Intake (rind, Flesh and Seeds) on Endothelial Function (P06-121-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Amandeep Sandhu ◽  
Jiayi Fan ◽  
Eunyoung Park ◽  
Indika Edirisinghe ◽  
Britt Burton-Freeman
Keyword(s):  
Pilot Study ◽  
Endothelial Function ◽  
High Performance ◽  
Future Research ◽  
Controlled Clinical Trial ◽  
Peak Time ◽  
Triple Quadrupole Mass Spectrometer ◽  
Funding Sources ◽  
No Bioavailability ◽  
The Relationship

Abstract Objectives Endothelial dysfunction is one of the early predictors of cardiovascular disease and proper functioning of the endothelium is dependent upon nitric oxide (NO) bioavailability. Watermelon is a rich source of bioactive components such as L-citrulline and arginine which can increase NO bioavailability directly and indirectly. The objective of this pilot study was to assess the effects of watermelon intake on endothelial function using Flow Mediated Dilation (FMD) and to assess the relationship of FMD overtime with circulating watermelon metabolites, such as L-citrulline and arginine in humans. Methods Middle-age overweight/obese adults (n = 6; age 32.4± 8.0 y and BMI 29.0 ± 1.7 kg/m2) participated in a 4-arm, randomized, cross-over energy-controlled clinical trial. Subjects consumed one of four 100 kcal salads containing watermelon flesh (WF) or rind (WR) or seed (WS) or no watermelon components (Control) on four separate occasions. Blood samples were collected at baseline (t = 0 h) and then 0.5 h, 1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 24 h post meal. The FMD was assessed at baseline 0 h, 1 h, 3 h, 5 h and 7 h. L-Citrulline and arginine were extracted from plasma at each time point and quantified using an ultra-high-performance liquid chromatography coupled with triple quadrupole mass spectrometer. Results Maximum concentration (Cmax) and peak time (Tmax) for L-citrulline after WF intake was 153.1 ± 38.8 µmol/L with Tmax of 1 h while after WR intake Cmax was 153.9 ± 38.5 µmol/L with tmax of 0.5 h. Cmax of L-citrulline was 76.1 ± 20.9 µmol/L at time 1 h after WS consumption. Arginine peaked at 1 h after WF, WR, WS intake with Cmax of 242.5 ± 35.8 µmol/L, 249.9 ± 38.7 µmol/L, and 249.5 ± 43.3 µmol/L respectively. An increase in %FMD was observed at 1 h after WF and WR compared to control, which coincided with the Cmax and Tmax of arginine and citrulline. However, the data was statistically not significant. Conclusions The data from this pilot study is the first to show a possible association between %FMD increase and circulating L-citrulline and arginine concentrations providing support for future research on watermelon with a larger sample size in order to determine the potential clinical impact of watermelon intake on improvement of endothelial function. Funding Sources National Watermelon Promotion Board.

The Mix Design Method and Performance for C60 Concrete Poles with High Strength, Impermeability and Frost Resistance

2014 ◽  
Vol 1035 ◽  
pp. 161-165
Author(s):  
Hai Jun Xing ◽  
Xin Tuo Hou ◽  
Bin Rong Zhu ◽  
Zi Fu Zhang ◽  
Zhen Fu Li
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Design Method ◽  
High Strength ◽  
Mix Design ◽  
Mineral Admixtures ◽  
Concrete Mix ◽  
And Performance ◽  
The Impact ◽  
The Relationship

In corrosive soils areasand extremely cold regions,high performance is required inthe impermeability and frost resistanceof concrete poles. In this paper, the mix design of C60 high performance concrete and the relationship between mix parameters and performance is studied and analyzed ,and the influence of the water-cement ratio, the amount of cementation materials, the mineral admixtures and other factors on High Performance Concrete is discussed, as well as the impact of different admixtures for concrete. According to the analysis results, the concrete mix is designed and used in practice.

Experimental Study on Permeability and Chloride Resistance Properties of Concrete in Yu-Cheng Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2253-2256
Author(s):  
Tao Fan ◽  
Jian Feng Dong ◽  
Yu Xi Zhao
Keyword(s):  
Experimental Study ◽  
Water Absorption ◽  
High Performance ◽  
High Performance Concrete ◽  
Salt Spray ◽  
Air Permeability ◽  
Normal Concrete ◽  
Chloride Resistance ◽  
The Relationship ◽  
Better Than

This paper studies air permeability, water absorption and chloride resistance properties of the normal concrete (NC) and the high performance concrete (HPC) adopted in the Yu-Cheng Bridge, Zhejiang Province. The air permeability and water absorption were measured by Autoclam, while the chloride resistance were tested by RCT after accelerate chloride ingression in the salt spray cabinet. The relationship among the air permeability, the water absorption and the chloride resistance of both kinds of concrete were analyzed. According to the result of Autoclam, HPC shows better resistance abilities of air permeability and water absorption, and this indicates that HPC is denser than NC. RCT shows that the chloride resistance of HPC is better than that of normal concrete.

HPC Subjected to High Temperature: A Study on Intrinsic and Mechanical Damage

2014 ◽  
Vol 629-630 ◽  
pp. 239-244 ◽  
Author(s):  
Chiara Rossino ◽  
Francesco Lo Monte ◽  
Stefano Cangiano ◽  
Roberto Felicetti ◽  
Pietro G. Gambarova
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Performance Concrete ◽  
Fiber Type ◽  
Heat Exposure ◽  
Mechanical Damage ◽  
Strain Curve ◽  
Before And After ◽  
Concrete Mechanical Properties ◽  
The Relationship

Heat-exposed High-Performance Concrete (HPC) has been the subject of relatively few studies focused on the relationship between the chemo-physical processes occurring in concrete constituents (microscopic level) and concrete mechanical properties (macroscopic level). In order to investigate the correlation between the intrinsic damage and the mechanical damage induced by heat exposure, eleven concrete mixes have been investigated, differing for: compressive strength (fcm,cube ≥ 45, 70, 95 MPa), aggregate type, fiber type (polymeric and metallic) and fiber content. The microstructural and mechanical characterization was carried out on concrete specimens before and after being exposed to 105, 250, 500 and 750°C. The results show that using different experimental techniques at the microstructural level allows to monitor the development of microcracks, whose size is similar to that of macropores. This behavior at the nano, micro-level is reflected by the post-peak branch of the stress-strain curve at the macro-level. This extensive investigation allows to understand concrete mechanical decay due to heating on the basis of microstructural observations, paving the way to mix optimization for high temperature and fire.

scholarly journals Rheological and Mechanical Properties of Ultra-High-Performance Concrete Containing Fine Recycled Concrete Aggregates

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3717 ◽  
Author(s):  
Lanzhen Yu ◽  
Lili Huang ◽  
Hui Ding
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Deformation Behaviour ◽  
Recycled Concrete ◽  
Ultra High Performance Concrete ◽  
Replacement Rate ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Fine Aggregates

The manufacturing process of ultra-high-performance concrete (UHPC) leads to a considerable amount of greenhouse gas emissions, which contribute to global warming. Using recycled concrete aggregates (RCA) to replace natural sand helps to reduce natural resources and energy consumption. In this study, the feasibility of manufacturing UHPC with fine RCA was investigated for the sustainable development of construction materials industry. We aimed to study the rheological properties, autogenous shrinkage, mechanical properties, and pore structure of UHPC with different amounts of RCA. The natural aggregate content was replaced with fine RCA at rates of 0, 20, 40, 60, 80, and 100 wt.%, and the packing density of the mixed fine aggregates in this study was estimated using a linear packing model. It was found that (1) the workability, mechanical properties, and deformation behaviour of UHPC with fine RCA were comparable to or even higher than those of UHPC made of high-quality aggregates; (2) the optimal replacement rate of fine RCA was in the range of 40–60 wt.%, considering the mechanical properties and deformation behaviour of UHPC; (3) the tensile strength, flexural strength, and Young’s modulus of UHPC increased by 6.18%, 12.82%, and 3.40%, respectively, when the replacement rate of fine RCA was 60 wt.%; (4) the maximum packing density of mixed fine aggregates presented a monotonic decreasing trend as the replacement percentage of fine RCA increased. These findings help to encourage and further promote the utilisation of RCA to produce UHPC.

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