Assessing the compressive strength and elastic modulus of high-performance GGBS concrete
Citation:
Gao, Jingran, Assessing the compressive strength and elastic modulus of high-performance GGBS concrete, Trinity College Dublin, School of Engineering, Civil Structural & Environmental Eng, 2022Download Item:
PhD Thesis - Jingran Gao.pdf (Published (author's copy) - Peer Reviewed) 4.146Mb
Abstract:
The mechanical properties of High Performance Concrete are crucial for structural design to
achieve expected advantages over conventional concrete. For example, the efficient
prefabrication of precast concrete requires sufficient early-age strength so that early striking
time and transport can be achieved. The stiffness of prestressed concrete significantly
determines the prestress loss as the deformation of concrete is strongly related to the elastic
modulus.
The studies of the mechanical properties of High Performance Concrete involve the
correlation between the compressive strength and the elastic modulus. There are also many
influencing factors that strongly affect these mechanical properties.
Ground granulated blast-furnace slag (GGBS), as a by-product from a steel plant, is a widely
used supplementary cementitious material in Ireland. The advantages and disadvantages of
using GGBS are both vital for assessing this material in concrete manufacture. It is necessary
to quantify the influence of GGBS on both the strength and elastic modulus under various
conditions.
There are many conventional methods that can be used to accelerate the development of
concrete after mixing to varying degrees. Thus both the strength and elastic modulus are
affected by these techniques under a faster growth rate. The individual effect of one
accelerating method and the combined effect of several methods together are both of
importance for determining the growth path of concrete strength and stiffness.
Numerical prediction of the compressive strength and elastic modulus is commonly
introduced in many standards and books through different formulae. The comparison of
calculated values and actual results provides a reliable method of determining the accuracy of
those formulae. For different countries with more complicated situations, modified formulae
with new variables and constants should be proposed based on experimental work for more
accurate prediction.
This research recommends values for constants and indices in the predicted equations used by
practitioners for both strength and stiffness using Irish aggregates and GGBS, together with
rapid hardening cement, an accelerating admixture and thermal curing in the high strength
precast industry.
Sponsor
Grant Number
Ecocem
Banagher Concrete
Description:
APPROVED
Author: Gao, Jingran
Advisor:
West, RogerPublisher:
Trinity College Dublin. School of Engineering. Disc of Civil Structural & Environmental EngType of material:
ThesisCollections:
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Full text availableKeywords:
Concrete, HPC, Compressive Strength, Elastic Modulus, GGBSLicences: