Influence of Superplasticizer Compatibility on the Setting Time, Strength and Stiffening Characteristics of Concrete
Muhsen Salam Mohammed,
Salahaldein Alsadey Mohamed,
Megat Azmi Megat Johari
Issue:
Volume 1, Issue 2, October 2016
Pages:
30-36
Received:
8 September 2016
Accepted:
23 September 2016
Published:
14 October 2016
DOI:
10.11648/j.aas.20160102.12
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Views:
Abstract: The adverse effects of elevated temperatures on the properties of the fresh concrete include increased water demand, shorter setting time and increased slump loss. Superplasticizer (SP) is important to enhance the workability and setting time of concrete under hot weather, hence, an experimental investigation was conducted to determine the effect of dosage of the mentioned admixture. Concrete mixes with SP dosages of 400, 600, 800, 1000 and 1200 ml/100kg of cement were prepared, together with two control mixes (water/cement ratio were 0.56 and 0.66 respectively). After casting, normal curing was carried out on the concrete samples. Properties such as compressive strength, porosity, water absorption, permeability and initial surface absorption were determined, besides determining the workability and setting time of the fresh concrete. Over dosage of SP were found to deteriorate the properties of concrete with indication of lower compressive strength and higher porosity. However, if the dosage levels are lower than the optimum dosage, increase in admixture dosage might help to enhance the concrete characteristics.
Abstract: The adverse effects of elevated temperatures on the properties of the fresh concrete include increased water demand, shorter setting time and increased slump loss. Superplasticizer (SP) is important to enhance the workability and setting time of concrete under hot weather, hence, an experimental investigation was conducted to determine the effect o...
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Framework for Traffic Engineering of SDN Data Paths
Issue:
Volume 1, Issue 2, October 2016
Pages:
37-45
Received:
15 September 2016
Accepted:
26 September 2016
Published:
15 October 2016
DOI:
10.11648/j.aas.20160102.13
Downloads:
Views:
Abstract: Software Defined Networking (SDN) is an approach to the deployment of future network infrastructures. SDN allows deal with different configurations to a crescent amount of virtualized network devices. In this paper, we offer a framework to support a number of network configurations through computational modeling and deployment of data paths between physical hosts for SDN. Computational modeling is a feasible alternative to measure and analyze the most diverse computational problems before its prototyping. We develop the toolset called Mini-TE (Mini-Traffic Engineering) to perform traffic engineering over computational models of data center topologies, and to set data paths before submission of data streams. As a consequence, Mini-TE contributes to reduce the operating expense to discover routes among hosts of data centers. We want to evaluate the effectiveness of our methodology by using Mininet through a set of experiments.
Abstract: Software Defined Networking (SDN) is an approach to the deployment of future network infrastructures. SDN allows deal with different configurations to a crescent amount of virtualized network devices. In this paper, we offer a framework to support a number of network configurations through computational modeling and deployment of data paths between...
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