Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.783236
Title: Investigating the structural performance of a new type of foamed lightweight cementitious material
Author: Ogbologugo, U.
ISNI:       0000 0004 7968 8329
Awarding Body: Coventry University
Current Institution: Coventry University
Date of Award: 2018
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Abstract:
The increasing need to reduce the permanent weight of structural members for construction, especially for elegant and towering structures, to allow for long spans and less expensive foundations, has been a driving force in the quest to develop materials for such accomplishments. The proposed material is a foamed lightweight cementitious material made from mixing sand, cement, water and a GEM-SOL catalyst. The material has prospects of a lower CO2 emission from lower cement consumption, having light weight and lower cost of constituent materials, self-levelling and free-flowing with potential for structural use in construction. The material also has the potential of improved energy efficiency of a building as a result of reduced thermal conductivity like other foamed concretes. This research investigates the structural performance of the proposed material by experimentally testing mechanical properties of the materials and then numerically exploring its structural behaviour by developing a finite element model that can simulate its behaviour using ANSYS software. Two sets of mixes of the proposed material with target densities of 1810 kg/m3 and 1600 kg/m3 were prepared and tested. The result from the experiment revealed that increasing the amount of GEM-SOL catalyst by 15% had improved the properties of the material such as its compressive (19% increase) and flexural strengths (30% increase). Compressive strength results from experiments for the mixes with design densities of 1810 kg/m3 and 1600 kg/m3 (the former density chosen as it is close to the higher limit of density for lightweight concretes and the latter for comparison) fall into the LC16/18 and LC20/22 strength class based on British Standard classification for lightweight concretes. The material could be suitable for use as structural members in low strength structural applications or can complement normal weight concrete for higher strength applications. The finite element model developed in the research showed good agreement with experimental tests results. Reinforced beams and slabs made from proposed material showed comparable flexural response to that of normal weight concrete of similar strength class in terms of failure load, however, the material offer less resistance to shear and crack propagation compared to normal weight concrete.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.783236  DOI: Not available
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