Reinforced Geopolymer Cement Concrete in Flexure: A Closer Look at Stress-Strain Performance and Equivalent Stress-Block Parameters

PCI Journal ◽  
2016 ◽  
Vol 61 (6) ◽  
Author(s):  
Brett Tempest ◽  
Janos Gergely ◽  
Ashley Skipper
Keyword(s):  
Equivalent Stress ◽  
Cement Concrete ◽  
Stress Strain ◽  
Geopolymer Cement ◽  
Stress Block

Evaluation of Stress Block Parameters for Steel Fibre Reinforced SCC with Recycled Concrete Aggregate

2016 ◽  
Vol 857 ◽  
pp. 76-81
Author(s):  
Elizabeth John Neethu ◽  
S.R. Akhil Raj
Keyword(s):  
Equivalent Stress ◽  
Axial Loading ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Concrete Aggregate ◽  
Stress Strain ◽  
Design Strength ◽  
Steel Fibres ◽  
Granite Powder ◽  
Stress Block

Stress block parameters are predominantly used in the design of concrete structural members and offer a convenient method to arrive at the flexural capacity. The objective is to find the equivalent stress block parameters namely, the effective average concrete ratio and the stress block depth factor for Self Compacting Concrete with recycled aggregate (RSCC) and SCC with recycled aggregate incorporating steel fibres (SFRSCC) . SCC is defined as a highly workable concrete which flows by its own weight. Sustainability of SCC can be improved by replacing mineral aggregates by industrial waste like rubber, recycled aggregate, granite powder etc. An experimental investigation was carried out on the stress strain characteristics of SCC by partially replacing 25, 50, 75 and 100 % of coarse aggregate by recycled aggregate (RSCC) for varying design strength 30, 40, 50 MPa under monotonically increasing axial loading. The behavior of SCC with 100 % recycled aggregate incorporating steel fibres with different volumetric ratios is also explored. A total of 72 cylinders were prepared to develop a stress strain model for RSCC and SFRSCC. The results were compared with the existing models used for SCC and recycled aggregate and it indicates that Saenz model was found applicable for finding the stress block parameters. The proposed parameters were found to be lesser than the values for normal concrete specified by IS 456 and that these parameters could be used to determine the flexural strength of members made using the above composites.

Manufacture of full-scale geopolymer cement concrete components: A case study to highlight opportunities and challenges

PCI Journal ◽  
2015 ◽  
Vol 60 (6) ◽  
pp. 39-50 ◽  
Author(s):  
Brett Tempest ◽  
Clarke Snell ◽  
Thomas Gentry ◽  
Maria Trejo ◽  
Keith Isherwood
Keyword(s):  
Full Scale ◽  
Cement Concrete ◽  
Geopolymer Cement

Compressive stress-strain model for low-calcium fly ash-based geopolymer and heat-cured Portland cement concrete

2016 ◽  
Vol 73 ◽  
pp. 136-146 ◽  
Author(s):  
Amin Noushini ◽  
Farhad Aslani ◽  
Arnaud Castel ◽  
Raymond Ian Gilbert ◽  
Brian Uy ◽  
...  
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Compressive Stress ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Stress Strain ◽  
Low Calcium ◽  
Strain Model

Measurement of Stress-strain Curves of PECVD Silicon Oxide Thin Films by Means of Nanoindentation

2006 ◽  
Vol 977 ◽  
Author(s):  
Zhiqiang Cao ◽  
Xin Zhang
Keyword(s):  
Thin Films ◽  
Plastic Deformation ◽  
Deformation Mechanism ◽  
Silicon Oxide ◽  
Equivalent Stress ◽  
Plasticity Theory ◽  
Stress Strain ◽  
Transformation Zone ◽  
Shear Transformation ◽  
Shear Transformation Zone

AbstractIn this paper, we explore the use of nanoindentation techniques as a method of measuring equivalent stress-strain curves of the PECVD SiOx thin films. Three indenter tips with different geometries were adopted in our experiments, enabling us to probe different regimes of plastic deformation in the PECVD SiOx thin films. A shear transformation zone (STZ) based amorphous plasticity theory is applied to depict the underlying plastic deformation mechanism.

Stress–Strain Analysis of a Pipeline With Inner and Outer Corrosion Defects

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Zheng Liang ◽  
Yao Xiao ◽  
Jie Zhang
Keyword(s):  
Outer Surface ◽  
Strain Distribution ◽  
Surface Defect ◽  
Equivalent Stress ◽  
Strain Analysis ◽  
Local Defect ◽  
Stress Strain ◽  
Defect Type ◽  
Single Defect ◽  
Inner Surface

A numerical simulation method is adopted to analyze the effects of three types of defect geometries ((1) a single defect on the inner surface, (2) a single defect on the outer surface, and (3) double coaxial defects on the inner surface and the outer surface.) on the residual strength of corroded X60 steel pipelines and equivalent stress and plastic strain distribution of the local defect area. The results show that the defect geometry exerts obvious effects on stress–strain distribution. The earliest plastic deformation occurs at the edge of the inner surface defect (type 1), but it occurs on the central part of both the outer surface defect (type 2) and the double defects (type 3). The appearance of defects greatly weakens the stability of the pipeline. For equivalent sum total corrosion defect depth, a single defect is more harmful to the pipeline than double defects.

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