Abstract. The paper presents the result of testing a new patented lightweight aggregates. The only solid material used to manufactured these aggregate is fly ash. Lightweight sintered aggregate is durable, lightweight and high-strength material. It is environmentally friendly material. It has chance to by future material in concrete use. The laboratory test shown that the concrete made from the this special lightweight sintered aggregate possesses low porosity, high strength and high durability potential. The bulk density, depending on the product fraction, oscillates between 550-830 kg/m 3 . This special lightweight sintered aggregate has also high resistance to crushing, when we compare to another lightweight aggregate.
The application of concrete waste for recycled aggregate concrete (RAC) used in structural members is associated with an increased risk for the structure due to, e.g. pollutions in the old crushed concrete and random variable strength. A new concept of RC flexural members like beams and slabs made of RAC with strengthening inclusion was elaborated and presented in the paper based on application of precast concrete inserts made of HSC, located in the compression zone of the members. The paper presents the results of experimental and numerical (FEM) analysis carried out on such composite beams. The results of experimental research on the behavior of such beams and numerical simulations using Diana computer program reveal some positive effects, such as higher stiffness and flexural capacity of the innovative beams compared to the reference beams made fully of RAC.
The article discusses the possibility of utilization of both waste from CHP plants (Combined heat and power plants), i.e. fly ash, and PET plastic waste (polyethylene terephthalate), through processing into lightweight aggregate used to construct reinforced concrete beam elements to protect the natural environment. Properties of the utilized lightweight artificial aggregates are presented. Selected results of experimental tests in the area of load-bearing capacity and deformability of reinforced concrete beams made in the model scale are presented. An analysis of tests showed that beam elements made with artificial aggregate, despite its lower resistance to crushing, do not differ in terms of their load-bearing capacity compared to reinforced concrete beams made with recycled aggregate, with better flexural strength properties in certain cases.
The concrete mix is one of the most common materials used in building structures. Starting from 1 July 2018, concrete for construction purposes in Poland must be produced as a part of the Factory Production Control (FPC). A literature review as well as a study of current control practices among the ready-mixed concrete suppliers and an expert survey has shown insufficient preparation of the Polish manufacturers for developing the FPC as a tool for monitoring the quality of concrete production. To deal with this problem, the authors developed an algorithm that shows a group of logically related tasks which are critical to success and may provide manufacturers' guidance in implementing the system in a particular case.
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