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Re‐thinking teachers' professional development: An analysis of National Professional Qualifications for school leaders in England

British Educational Research Journal, EarlyView.
Abstract This article considers how teachers' professional development could be redeveloped to help address the current crisis in teacher recruitment and retention by offering greater intellectual rigour and more opportunities for intellectual growth. Our analysis is focused on the UK government's current policy for leadership development in schools in
Mark Innes, Elizabeth Gregory, Louisa Dawes   +2 more
wiley   +1 more source

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Interface strength of High-Strength concrete to Ultra-High-Performance concrete

Engineering Structures, 2022
Abstract High-Strength Concrete (HSC) has been used in the production of precast concrete structures while Ultra-High-Performance Concrete (UHPC) has been considered an option for filling the connection between HSC elements due to outstanding mechanical properties and durability.
Lisiane Pereira Prado, Ricardo Carrazedo, Mounir Khalil El Debs   +2 more
openaire   +1 more source

Shrinkage of High-strength Concrete and High-flowability Concrete

HKIE Transactions, 2010
Throughout the years, a large amount of research on the shrinkage of normal concrete with cube compressive strength up to 60 MPa has been carried out. Relatively, the amount of research on the shrinkage of high-strength concrete and high-flowability concrete is not as much.
Wong, HHC, Kwan, AKH, Fung, WWS
openaire   +2 more sources

Minimum Reinforcement in High‐Strength Concrete

Journal of Structural Engineering, 1990
A dimensional analysis criterion is proposed to compute the minimum amount of reinforcement for high‐strength concrete members in flexure. Such an amount is assumed to be provided by the condition of simultaneous first cracking aand steel yielding. The fracture mechanics model utilized defines a brittleness number NP, which is revealed to be a measure ...
BOSCO, CRESCENTINO, CARPINTERI, Alberto, DEBERNARDI, PIER GIORGIO   +2 more
openaire   +2 more sources

Testing High-Strength Concrete Compressive Strength

ACI Materials Journal, 1993
Comparative testing reveals that high strength concrete (HSC) compressive strength values are greater by 5% when measured on 100 x 200 mm specimens. Moreover, the coefficient of variation on one set of three 100 x 200 mm specimens is as small as, or smaller than that for 150 x 300 mm specimens.
openaire   +1 more source

Evolution from High Strength Concrete to High Performance Concrete

Key Engineering Materials, 2014
High strength concrete for the production of concrete railway sleepers was designed more than 20 years ago. The compressive strength of the concrete was very high from the start, but flexure strengths showed some irregular development - a decrease in time. Later, also a significant decrease of fracture properties was recorded.
Vlastimil Bilek, Vladimíra Tomalová, Petr Hájek, Ctislav Fiala   +3 more
openaire   +1 more source

Core Strengths of High-Strength Concrete

"SP-172: High-Performance Concrete - Proceedings: ACI International Conference, Malaysia 1997", 1999
The effects of varying L/D ratios and core size on the strength of cores from large elements of high strength concrete (HSC) made both in the laboratory and field were examined. 154 cores representing 5 laboratory mixtures having moist-cured cylinder compressive strengths from 114 to 142 MPa at 5-years age and 101 cores representing actual field ...
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Very High Strength Cement for Very High Strength Concrete

MRS Proceedings, 1984
AbstractDuring 1984 summer, an experimental concrete column was cast in a 26-story high-building using a 100 MPa silica fume concrete. Only the coarse aggregate was selected specifically for this concrete. The cement used was an ordinary type 1 Portland cement. The superplasticizer was a naphthalene base.
Pierre-Claude Aftcin, Claude Bédard, M. A. Sc. Marc Plumat, Gilbert Haddad   +3 more
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Comparison between high strength concrete and normal strength concrete subjected to high temperature

Materials and Structures, 1996
Two normal strength concretes and three high strength concretes, with 28-day compressive strengths of 28, 47, 76, 79 and 94 MPa respectively, were used to compare the effect of high temperatures on high strength concrete and normal strength concrete.
Sammy Y. N. Chan, Gai-fei Peng, John K. W. Chan   +2 more
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Compressive strength of heated high-strength concrete

Magazine of Concrete Research, 2007
The present study is aimed to study the effect of elevated temperatures ranging from 50 to 250°C on the compressive strength of high-strength concrete (HSC) of M60 grade made with ordinary portland cement (OPC) and pozzolona Portland cement (PPC). Tests were conducted on 100 mm cube specimens. The specimens were heated to different temperatures of 50,
M. Potha Raju, K. Srinivasa Rao, P. S. N. Raju   +2 more
openaire   +1 more source