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Title: Fresh properties, temperature rise and strength development of high strength concrete with binary and tertiary blended cements.
Author: Sheikh, Vassiem.
ISNI:       0000 0001 3401 9605
Awarding Body: University College London (University of London)
Current Institution: University College London (University of London)
Date of Award: 2001
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The use of high strength concrete in the construction industry has become more frequent as both the knowledge of the behaviour of the material and the confidence in its production have increased. An appropriate formulation of materials and mix proportions can result in significantly enhanced performance such as high early strength, reduced heat of hydration and increased durability. As a step towards obtaining optimum performance, an investigation has been carried out on the fresh properties (workability), temperature rise during hydration and strength development. This research was aimed at understanding the role of supplementary cementing materials in binary (OPC+PFA, GGBS, CSF) and ternary (OPC+ CSF/PFA, CSF/GGBS) combinations in these three areas. With respect to workability the use of binary mixes of PFA or CSF reduce the superplasticiser dosage required to obtain a target slump, whereas GGBS increases it. Optimum replacement levels of 10% CSF, 40%PFA+l0%CSF and 60%GGBS+l0% CSF were found at a water/binder ratio of 0.26. Binary mixes of 40% PFA or 60% GGBS reduce the peak semi-adiabatic temperature rise compared to their equivalent OPC mix at 0.26 water/binder ratio. Ternary combinations of 10% CSF with PFA or GGBS have shown significant reductions in peak temperature rise compared to their equivalent binary mixes. Measurement of the in-situ strength by temperature matched curing (TMC) has shown higher early age strengths but lower long term strengths for both binary and ternary mixes compared to cubes cured under standard conditions (20°C). Microstructural evaluation of hardened cement paste indicates that these differences in strength are likely to be associated with stresses generated at the paste/aggregate interface. A novel non-destructive technique to assess the in-situ strength has shown good correlation between conductivity and strength development of high strength concrete.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available