Fabric as a flexible formwork for concrete is an alternative giving builders, engineers, and architects the ability to form virtually any shape. This technique produces a superb concrete surface quality which requires no further touch up or finishing. Woven polyole-fin fabrics are recommended for this application. A permeable woven fabric allows excess water from the concrete mix to bleed through the mold wall, and therefore reduce the water-cement ratio of the concrete mix. Due to the reduction in water-cement ratio, higher compressive strength in fabric formed concrete may be achieved, as also suggested by earlier research. The current research study was conducted to investigate and document the changes in concrete strength and overall quality due to use of commercially available woven polyolefin fabrics. Use of fabric formwork will contribute to decreased construction cost, construction waste, and greenhouse gas emissions. Two sets of tests were conducted as a part of this research study including comparison of compressive strength of fabric formed versus PVC formed concrete cylinders and comparison of be-haviour of the fabric formed reinforced columns versus cardboard formed reinforced concrete columns. Variables in this research were limited to two types of fabric with dif-ferent permeability (Geotex 104F and Geotex 315ST) and two types of concrete; concrete made with conventional Portland cement and no flyash herein called normal concrete (NC) and concrete with 30 percent flyash in its mix design (FAC). The laboratory results revealed that fabric Geotex 315ST is an ideal geotextile for forming concrete. It was also found that the effects of fabric formwork on concrete quality in a large member are limited mostly to the surface zone and the core of the concrete remains the same as a conventionally formed concrete. Even though fabric formed cylinder tests showed an average of 15% increase in compressive strength of the concrete samples, compressive strength of the reinforced columns did not dramatically change when com-pared to the companion cardboard formed control columns. This research confirmed that fabric formwork is structurally safe alternative for forming reinforced concrete columns.

Fabric as a flexible formwork for concrete is an alternative giving builders, engineers, and architects the ability to form virtually any shape. This technique produces a superb concrete surface quality which requires no further touch up or finishing. Woven polyole-fin fabrics are recommended for this application. A permeable woven fabric allows excess water from the concrete mix to bleed through the mold wall, and therefore reduce the water-cement ratio of the concrete mix. Due to the reduction in water-cement ratio, higher compressive strength in fabric formed concrete may be achieved, as also suggested by earlier research. The current research study was conducted to investigate and document the changes in concrete strength and overall quality due to use of commercially available woven polyolefin fabrics. Use of fabric formwork will contribute to decreased construction cost, construction waste, and greenhouse gas emissions. Two sets of tests were conducted as a part of this research study including comparison of compressive strength of fabric formed versus PVC formed concrete cylinders and comparison of be-haviour of the fabric formed reinforced columns versus cardboard formed reinforced concrete columns. Variables in this research were limited to two types of fabric with dif-ferent permeability (Geotex 104F and Geotex 315ST) and two types of concrete; concrete made with conventional Portland cement and no flyash herein called normal concrete (NC) and concrete with 30 percent flyash in its mix design (FAC). The laboratory results revealed that fabric Geotex 315ST is an ideal geotextile for forming concrete. It was also found that the effects of fabric formwork on concrete quality in a large member are limited mostly to the surface zone and the core of the concrete remains the same as a conventionally formed concrete. Even though fabric formed cylinder tests showed an average of 15% increase in compressive strength of the concrete samples, compressive strength of the reinforced columns did not dramatically change when com-pared to the companion cardboard formed control columns. This research confirmed that fabric formwork is structurally safe alternative for forming reinforced concrete columns.

In recent years, with the continuous growth of population, people's demand for housing is also increasing. Especially since the 21st century, the number of high-rise apartments in major cities in the world has increased significantly. As the mainstream technology in high-rise buildings,the formwork method is developing and many new formwork systems are appeared. In a complete construction project, although the cost of formwork is not high, it also requires a lot of manpower and time limit. That is why it is very important to choose the appropriate formwork. They have their unique advantages and disadvantages, whether it is the traditional wooden formwork, the current mainstream beam formwork and frame formwork, or the new aluminum system formwork. Therefore, with the continuous innovation of formwork technology, that the application of formwork in high-rise buildings should also develop in a diversified direction. This article will conduct an economic and technical analysis of various common formworks to discuss how to choose high-rise building formworks and analyze the rationality of the selection, that combined with actual projects in China. The importance of the formwork mothod in the economic execution of concrete structures is summarized through the comparison between the various formworks.:1 Introduction 1.1 Importance of formwork in construction 1.2 Overview of formwork engineering development 2 Types of formworks 2.1 Traditional wooden formwork systems 2.2 Modern formwork systems 2.2.1 Girder formwork 2.2.2 Frame formwork 2.3 System formwork 2.3.1 MIVAN Technology 2.4 Comparison of three types of formwork 3 The method of the formwork selection in the construction business 3.1 Selection working method 3.2 Factors influencing the selection of formwork system 4 Cost of formwork 4.1 The cost comparison of traditional formwork and modern formwork 4.2 The Cost comparison of three formworks in one project 4.3 Indirect economic effects of different formworks 4.4 Conclusion 5 Process comparison 5.1 Comparing technology (traditional formwork and MI -VAN formwork) 5.2 Comparison technology (traditional formwork and modern formwork) 5.3 Comparison of the process in two projects 5.3.1 The traditional wooden formwork system used in the Zhang-gong middle School (Jiangxi, China) 5.3.2 Aluminium Formwork system used in the Shenton Way 5.4 Comparing the construction period of the MIVAN formwork and the conventional formwork 5.5 Conclusion 6 Practical examples and evaluation 6.1 The Festival Walk - traditional manual-type wooden formwork 6.2 Belcher's Gardens Redevelopment - traditional manual -type wood form 6.3 Park Avenue (Phase II) - aluminum form 6.4 Conclusion 7 Summary and outlook 7.1 Summary 7.2 Outlook 8 Literature

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concrete has a memory. It stores the construction sequences. It shows what it is made of and how it is made. The texture of the formwork, the color difference of the pours, and the shadows of the metal ties combine to layer the beauty of concrete. The aim of this study is to explore the instruments of a concrete surface in order to enhance this multi-sensory experience. This study began with the design of a concrete wall and evolved into the design of a single-family home. / Master of Architecture

Approximately half of all framework collapses occur during concrete placement. Researchers who have measured the actual loads in formwork shores consistently found that they differ from those predicted. There is some evidence that current methods tend towards underestimation. In Australia the current practice for designing steel formwork shores is set out in Australian Standard AS 3610-1990 Formwork for Concrete. It was the first national standard to be published in limit states format and departed from previous practice introducing new methods for the design of formwork shores. Prompted by doubt cast on current practice and the absence of hard basis for the methods set out in AS 3610, the aim of the research is to develop new more reliable rules for the design of steel formwork shores. This is achieved using first-order probabilistic techniques to compare the reliability of new and reused shores designed in accordance with AS 3610 with current international permissible stress and limit states methods form British, American, Israeli and draft European formwork Standards / Master of Engineering (Hons)

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No description available.

Für die Herstellung großformatiger dünnwandiger Schalentragwerke bedarf es geeigneter Schalungssysteme, die eine frei geformte Geometrie, eine erhöhte Wiederverwendbarkeit sowie eine glatte Sichtbetonqualität der Elemente ohne Fehlstellen (Architekturbeton) in Kombination mit einer hohen Produktivität gestatten [1]. Derzeit ist die Herstellung frei geformter Beton-Leichtbauelemente sowohl mit einem erheblichen Material- und Montageals auch Kostenaufwand verbunden [2]–[4]. Zu üblichen Schalungstechniken zählen konventionell segmentierte Holz- und Stahlsysteme, pneumatisch gestützte und modellierte Schalungen sowie deren Kombinationen. Für einfach verformbare Schalungssysteme sind dazu einige Patente angemeldet worden, z. B. [5]–[7]. Aktuelle Forschungen (wie bspw. [8]–[11]) beschäftigen sich weiterhin mit flexiblen Schalungssystemen, die über zahlreiche einstellbare Aktuatoren frei formbare Flächen mit zumeist polymeren Schalhäuten erzeugen. / For the production of large-size concrete shell structures with thin walls, it is necessary to provide formwork systems, which permit freely formed geometries, enhanced reusability and smooth, fair-faced concrete quality of the elements without defects (architectural concrete) in combination with high productivity [1]. Currently, the production of lightweight, freeformed concrete elements is characterized by high material and installation eff orts as well as costs [2]–[4]. Common formwork techniques include segmented systems made of wood or steel, pneumatically supported and modelled formworks as well as combinations thereof. There are some pending patents on simply deformable formwork systems, e.g. [5]–[7]. Furthermore, recent research activities encompass flexible formwork systems, which generate free-form areas with the help of numerous adjustable actuators and polymer membranes [8]–[11].

Today construction industry is building higher and more complicated constructions than ever thanks to the advancements in materials, technical knowledge and methodologies. One important material is concrete, which has been used to create impressive architectural marvels. This dissertation aims to examine the differences between climbing and slip formwork systems for tall concrete structures that require several pouring steps in height. The main differences noted between both systems are formwork configuration, assembly and cycling of the formwork and climbing elements, price and quantity of material, labor required, the quality of the finished structure and safety during construction. A case study was investigated with the help of formwork supplier PERI Sverige AB and nordic contractor PEAB AB regarding a 20,5 meter high reinforced concrete silo located in a mining complex in Kiruna, Sweden. Through a review of the existing literature in the subject, interviews with experts in the topic and the outcome from the project case study, the results shows that while the SCS climbing system from PERI Sverige AB required more working days compared to a slip formwork system, it was chosen as a more appropriate solution for this project in combination with the crane at the jobsite, due to the amount of labor required, safety and overall cost of it. In conclusion, the selection of the SCS climbing system as formwork system proved to be the most adequate solution for the case study when critical aspects such as assembly and cycling of formwork, price and safety were evaluated.