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Jan 28, 2019 · where A s is the cross-sectional area of the strip and A g is the cross-sectional area of the interface groove. To investigate the influence of the precast concrete interface groove on the compression performance of the putty-based composite strip, two typical groove depths of 4 mm and 6 mm were used as shown in Fig. 3.The dimension of the two grooves was 40 × 34 × 4 mm (occupying …
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Abstract The main objective of this research is to investigate the applicability of diffuse ultrasound to the evaluation of distributed micro-cracking damage in concrete. To simulate the micro-cracking damage, polypropylene fibers with very low mechanical characteristics were embedded in concrete specimens, using three different fiber amounts (0, 0.3, and 0.6% by volume) to represent three
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American Concrete Institute Committee 318, "Building code requirements for structural concrete (ACI318-14)," 2014. Google Scholar Andermatt, M. F. and Lubell, A. S. [ 2013 ] " Behavior of concrete deep beams reinforced with internal fiber-reinforced polymer-experimental study," ACI Struct.
May 05, 2020 · The friction at the steel pipe–flowing concrete interface plays an important role in concrete pumpability. To reduce the friction or improve pumpability, in this paper, various ultrafine powders (nanoclay, nano-CaCO 3, and microsized marble powder) are incorporated into a highly flowable concrete mixture with a low water-binder ratio (w / b = 0.35) at a dosage of 1% (by weight) as a cement
concrete slab such that the steel and concrete act as one element. Compression – the state, for example in a column or an element of a truss, whereby a member is being shortened by a force. Compression is an axial load that is the opposite of tension. Connection – a …
Nov 01, 1998 · Google Scholar. Author and Article Information 1985, Dynamic Response of Concrete and Concrete Structures, Second Annual Technical Report, AFOSR, Contract F49620-83-K007. 15. Malvern, L. E., and Ross, C. A., 1984, Dynamic Response of Concrete and Concrete Structures, First Annual Pipeline Pumping and Compression Systems: A Practical
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Oct 04, 2021 · When concrete flows in the pipes under certain pumping pressure, the following principle of force balance is satisfied: (1) Δ P  · π r 2 = τ  · 2 π r  · Δ L where ΔP is pressure loss in the pipelines, ΔL is the length of pumping pipe, r is the distance from concrete to the center of the pipe, τ is the shear stress in concrete
Apr 16, 2020 · The most notable of these processes is 3D concrete printing (3DCP), first pioneered as a process called Contour Crafting. 5 Currently, 3DCP is a subject of research at many research institutions and companies worldwide, and the first built examples are appearing. 6–8 Although promising as a large-scale fabrication method due to generally high
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concrete slab such that the steel and concrete act as one element. Compression – the state, for example in a column or an element of a truss, whereby a member is being shortened by a force. Compression is an axial load that is the opposite of tension. Connection – a …
Concrete pump booms are subjected to vibrations that increase mechanical stress and shorten their lifespan. This paper aims to study the problem by considering the two subsystems, the boom and the concrete pump, that have the greatest effect on the phenomenon. The authors supply numerical and experimental tools that can analyze the problem in depth in all its complexity.
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May 02, 2010 · The sampling included C80-20, C80-14 and C60-14 concretes. There was some variation in the results but the average effects of pumping to elevations from 350 m to 580 m was a 2–3°C rise in temperature and a 10% reduction in slump flow. Pumping was found roughly to halve the plastic viscosity of the concrete and double the dynamic yield stress.
Dissertations & Theses from 2019. Krishnan, Ankita (2019) Understanding Autism Spectrum Disorder Through a Cultural Lens: Perspectives, Stigma, and Cultural Values among Asians . Suzuki, Takakuni (2019) Quantifying the Relations among Neurophysiological Responses, Dimensional Psychopathology, and Personality Traits . Dissertations & Theses from 2018. Abdel-Salam, Ahmed Nabil (2018) …
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