By Helmut Kuch, Jörg-Henry Schwabe, Ulrich Palzer
ISBN-10: 376400519X
ISBN-13: 9783764005191
The versatile use of prefabricated concrete items calls for a continually expanding range in regards to clean concrete combine designs and houses, moulding techniques, floor finishes and product characteristics.
This development imposes ever-higher standards on brands of the linked construction gear and on precast crops. the most objective is to enforce a versatile creation method in all processing phases. The appropriate correlations and interactions have to be completely thought of and evaluated with a view to make sure that concrete items and precast components are synthetic to the mandatory caliber standard.
To date, no entire description of those correlations has been released within the proper literature. This richly illustrated ebook closes the space by means of describing the fundamental rules of the creation techniques, the basics of fabrics, the composition of the concrete combine, and the apparatus used for concrete creation. in actual fact prepared chapters aspect the construction approaches and kit used to fabricate small concrete items, concrete pipes and manholes, and precast elements.
The authors have used their a long time of expertise within the box of precast know-how and their shut ties to the undefined. Their objective was once to combine glossy checking out and calculation equipment from neighbouring disciplines into precast know-how. This comprises, for example, modelling and simulation of the workability behaviour of mixes, implementation of the newest developments in computer dynamics to the layout and engineering of construction gear, and using stateof-the-art measuring and automation know-how for quality controls reasons.
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Sample text
Low-slump concrete mixes are moulded by combined vibration and pressing – these two types of action ensure appropriate compaction of the mix. Hydraulically operated tamper systems generate the required loading pressure. By modification of the Proctor method and inclusion of vibratory compaction, the testing conditions were gradually adjusted to come as close as possible to those occurring during the manufacture of concrete products. 42]. 37]. The bulk density of the fresh concrete is derived from the mass of the poured concrete mix and the volume measured after compaction.
27) [kg/m³] [kg/m³] [kg/m³] [kg/m³] [dm³/m³] [kg/dm³] [kg/dm³] [kg/dm³] [kg/dm³] The starting point for a mix design is the target compressive strength of the concrete product. The compressive strength of concrete is influenced by the water/cement ratio and the standard compressive strength of the cement. The relationship between these two factors is given by so-called Walz curves. These curves indicate the water/cement ratio required to achieve a specific compressive strength for a given standard compressive strength of the cement used in the mix.
2 Concrete Mix Design and Composition a) Basics According to generally accepted terminology, concrete is termed fresh as long as it is still workable and compactable. Since the authors of this book are focussing on processes occurring during placement and compaction of concrete mixes for the production of premium concrete products, the following additional definitions are introduced: The term “concrete mix” refers to the mix from the time of mixing to its placement in the mould or formwork. The term fresh concrete refers exclusively to fully compacted concrete.
Manufacturing of concrete products and precast elements processes and equipment by Helmut Kuch, Jörg-Henry Schwabe, Ulrich Palzer
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