§4.7advanced concrete 4.7.1 the sixth composite of concrete 4.7.2 high-strength concrete (hsc)...
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§4.7Advanced Concrete
4.7.1 The Sixth Composite of Concrete
4.7.2 High-strength Concrete (HSC)
4.7.3 High Performance Concrete (HPC)
4.7.4 Pumped Concrete
4.7.5 Non-dispersion Concrete in Water (NDC)
4.7.6 Seawater-resistant concrete
4.7.7 Green Concrete
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4.7.1 The Sixth Composite of Concrete
• Introduction
• Reformed Type
• Functional Type
• Intelligent Type
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• The sixth composite of concrete refers to the composite used to improve concrete performance, provide with more functions or make the concrete intelligent, besides cement, water, sand and chemical admixture.
• By feature it can be classified into– reformed type– functional type – intelligent type
Introduction
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Reformed Type
• The reformed type is designed to improve concrete physical property
• It contains – mineral admixture– polymer – fibre
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Mineral Admixture • Mineral admixture refers to some fine a
nd active mineral material added in bleeding to improve concrete mixture and hardening concrete (esp. durability ).
• It has the following kinds silica fume, grinding fly ash, slag micronization, zeolite powder, kaolin and its complex.
Reformed Type
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Polymer
• Polymer concrete and mortar are mainly influenced by polymer type and its quantity.
Reformed Type
Fibre • If added with fibre, such as carbon fibre, st
eel fibre, organic fibre, the traditional concrete will have great improvement in tensile, toughness, crack resistance, fatigue resistance.
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Fig.4.7.1Load-deflection Curve of Composite Materials in Fibre Reinforcement Cement
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Conductive Concrete • There is a critical point in conductive
composite.• When its quantity exceeds the critical point,
conductivity of the composite materials will increase dramatically.
Reformed Type
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Fig. 4.7.2 Relation between Conductivity of the Composite Materials and Quantity of Carbon Fibre
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Functional Type • The functional type of composite can provi
de special functions– for example
• radiation protection• static protection• shrinkage water• anti-abrasion• heat reservation• heat insulation
• It is mainly applied in making functional concrete, such as– conductive concrete– shielded electromagnetism radiation concrete– shielded magnetic concrete
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Intelligent Type
• Temperature Temperature sself-monitoring elf-monitoring cconcreteoncrete• Animated self-healing concreteAnimated self-healing concrete• Traffic navigation concreteTraffic navigation concrete• Self-diagnoses concreteSelf-diagnoses concrete• Moisture-adjustable concreteMoisture-adjustable concrete
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• Within the maximum difference of temperature of l5℃and the highest of 70℃ , electromotive force E and maintain a steady linearity relation Fig4.7.3.
• As the curing age prolongs the electromotive force ratio takes on a stable tendency (Fig.4.7.4).
Temperature self-monitoring concrete
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Fig.4.7.3 Relation between Electromotive Force and Difference of Temperature
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Fig. 4.7.4 Influence of the Electromotive Force Ratio by Curing Age
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Animated self-healing concrete
Fig. 4.7.5 Illustration of Animated Self-healing Concrete Mechanism