ICCX DIGITAL 365. Live-Days - Conference Program
Conference Program for next live days in June will be available soon. You will find the following videos always on demand at the ICCX digital 365.
ICCX DIGITAL 365. - On demand
Dr. Wolfram Schmidt
R&D Engineer, Peikko Group
Technical Director, FEBE
Prof. Peter Mark
Concrete technologist, Sonocrete
Dr. Andreas Roye
Institute of Façade Engineering
Admixture selection criteria for robust casting of flowable concrete
|Water reducing agents do have the capacity to significantly enhance process and materials robustness in modern concrete casting and help facilitating more environmentally friendly, and sustainable concrete mixture compositions. However, their use adds additional complexity to the casting process. To date, water reducing agents are widely used in the industry, but there is little understanding how differently modified plasticizers can be applied to tailor specific properties of flowable concrete and to enhance the robustness. The talk will present the most fundamental parameters that are relevant to understand how plasticizing admixtures function and offers easy to handle decision making tools to improve concrete performance according to specific casting processes and environmental frameworks.|
Slim-floor composite beams in combination with hollow-core slabs in fire case
Peikko, a leading global supplier of concrete connections, composite structures, and wind energy applications, has carried out a series of fire tests with its DELTABEAM® slim-floor composite beam supporting hollow-core slabs. This webinar will give an overview of the background, results, and conclusions of this sophisticated research project.
When designing a slab system comprising Deltabeam composite beams and prestressed hollow-core slabs (HCS) for the event of a fire, neither of these products’ current European design codes or product approvals cover the special issues “change of direct support situation” and “flexible support on a beam”. These issues arise from their combination when the steel bottom flange of the composite beam is heated, and the supporting beam is heavily bending from thermal exposure.
To assess these issues, Peikko has carried out a test program of single HCS unit shear tests and system fire tests. The tests with Deltabeam and hollow-core slabs suggest there is no flexible shear issue in the event of fire if the beam deflections are within certain boundaries, and that the shifted direct support model with straight tie reinforcement is safe.
The Future of Automatic Production Plants
The year 2020 was difficult for all of us. Thankfully, the housing sector remained unaffected and everyone involved had a very good year economically. Looking ahead, what can we expect from the future? We know that forecasting the future is always difficult, but we want to try anyway. After the Corona crisis is overcome and the uncertainties regarding jobs are reduced, everything should be on the rise again. According to this logic, investments should be made now to be prepared for the future. But the question is how? Modernising the existing system or building a new one?
Actually, it's easy if you look at the right parameters. There is only one parameter that you can have an influence on. That is the efficiency of production, i.e. the man-hours per m². Other parameters such as the prices for cement, steel or energy cannot be influenced or can only be partly influenced. The same applies to sales prices. Therefore, the focus of modernisation must be placed on efficiency.
Historical development of Hollow Core slabs
The idea to reduce the self-weight of concrete slabs by putting voids in the centre of the cross-section, dates to the beginning of the previous century. Several inventors from different countries applied for patents on various systems. The presentation provides an analysis of patents published during the first half of the 20th century, and on experiences from 1960 on. Patents usually offer a complex description of inventions (claims). Reconstructing the history of hollow core slabs based on these patents is a laborious but fascinating exercise. The presentation aims to give a historical overview as a starting point for further discussions.
DFG Priority Programme SPP 2187: Adaptive modular construction methods for serial production
Sustainable construction has to meet a wide range of requirements. It is necessary to use materials, finances and labour sparingly, to manage construction sites such that they create little disruption to others, and to create durable structures with long service lives. The aim of the Focus Programme (SPP) 2187 "Adaptive modular construction methods for serial production" is to develop methods of serial production for precast concrete elements that enable the shortest possible construction time. For this purpose, structures are divided into similar modules, which are prefabricated and subsequently assembled on site. It is important to monitor the development of the modules and provide thorough quality assurance, in order to ensure that no single part is missing and that no post-processing is necessary. The installation follows the concept of the digital twin and mirrors the basic digital model of the structure.
The German Research Foundation (DFG) has been funding the SPP since 2020. The programme is planned to run for six years and brings together around 60 researchers from the disciplines of structural engineering, production technology, building informatics and mathematics. Cross-disciplinary thinking and development is required.
Ultrasound assisted concrete production
Sonocrete is developing a new and innovative concrete mixing system with the support of Ultrasound (US). Ultrasound is widely used in various technical processes (from pharmaceutics to ceramic and fuel industry) to disperse suspensions and to control crystallization processes. The application of US in concrete production is investigated by the authors in the recent past. For this purpose, two different concretes were prepared and investigated. With US the hydration of Portland cement can be accelerated effectively, which results in significant higher compressive strengths and improved fresh concrete properties at early ages. 28-day compressive strengths and chemical composition are not affected by applying US.
It is shown that ultrasound assisted concrete mixing leads to strongly accelerated concrete hardening and thus, paves the way for reduction of cement content or heat treatment.
Digitization powered by light transmitting concrete
Light transmitting concrete has been invented by a Canadian engineer in the 1930ies. In those days, the combination of liquid concrete with glass bottles allowed the creation of „light transmitting concrete“ for the first time in history.
LUCEM, has realized more then 400 projects worldwide using both, natural and artificial light sources. The gathered knowledge allows nowadays a future-like design of walls, floors, facades, furniture and even landscaping products such as illuminated concrete paving. Due to individual high-power LED control in combination with self-developed Apps and Cloud-based software, LUCEM can provide digital displays with robust concrete surfaces and a detailed low-resolution display at the same time.
Main applications at the moment are typically entrance areas with individualized content (such as „your room is on 3rd floor“) but will soon be found in public space design, when a line will show you the perfect parking space or the fastest way to the train.
Precast Facades for Compliance
The same appearance of the facade can be achieved by more than one method of construction. The decision on how to build depends on the clients objective. It is quicker to build tall buildings in prefabricated unitised-facades. Masonry or ventilated rain-screen facades are cost-effective for low-rises. However, there is one parameter that is almost always on the side of precast concrete facade. It is compliance. Precast could be the clearest route of proving the compliance with the normative base in the UK. In his talk Eugene will go through several precast concrete facade case studies. For these buildings acoustic, fire-safety and condensation risks were managed best by the precast concrete.