Mechanical Properties of Precast Concrete Pipe (PCP) Sheet Under Different Curing Conditions and Ages
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Precast concrete
The Technology of precast concrete growing rapidly. The concrere research has been aimed to create an innovation simplify and to reduce weaknesses of concrete include precast concrete. This study aims to research the connection of precast beams with combination notches type. This study used precast beams which dimensions were 20x30x270 cm, f’(c) was 25MPa. The precast beams which connection by diagonal types, the length of connection was 15 cm and 20 cm. The samples used 3(three) beams ie. 2 (two) of beams precast as BM-15 and BM-20 which are connected by diagonal types with grouting 0MPa and 1 (one) of monolith beam as BN. The results of researches that the strongest beam precast was BM-20 on 44,05 kN or 30,41 % than monolith beam (BN).
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Structural Installation of Precast Concrete Elements Lushomo Jule, Huang Zhuye, Mwendanga Cedric, Jian Xiaosheng Abstract Precast Concrete construction is a building method used in modern construction. It is important in the development of construction methods, as it deals with some of the major factors influencing construction: budget, environment and time. This paper will review the installation of precast elements on a construction project. Practical experiences are discussed and gained. This paper aims to have an in-depth look at the assembly of precast elements using sleeve and cast-in-site connections to join beams, columns, walls and slabs to form a monolithic structure. Full Text: PDF DOI: 10.15640/jea.v8n2a1
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Abstract This study investigates the influence of different percentages: 10, 30, and 50% of limestone powder (LS) and different curing temperatures: 50, 20, and 5°C on mechanical properties and microstructure of mass concrete. The microstructure is studied by X‐ray diffraction, thermogravimetric, and scanning electron microscopy. The results show that the mechanical strength of concrete gradually decreases with the increase of LS. Curing temperature 50°C enhances mechanical strength of LS concrete at ages of 3 and 7 days, but slightly reduces that at age of 28 days. While curing temperature 5°C significantly reduces the mechanical strength at ages of 3, 7, and 28 days. The microstructure results indicate that LS has weak chemical effect and can participate in cement hydration. Different curing temperatures can significantly influence the hydration products and microstructure of LS composite cement pastes.
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This publication is a combination of four documents on the use of precast concrete pavement systems (PCPS) and constitutes a state of the art report on this topic. The documents were developed through a cooperative agreement between the Precast/Prestressed Concrete Institute, PCI and the Federal Highway Administration (FHWA). The topics include: Applications for Precast Concrete Pavements, Design and Maintenance of Precast Concrete Pavements, Manufacture of Precast Concrete Pavement Panels and Construction of Precast Concrete Pavement.
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Experimental results of new precast concrete beam-column connections constructed by post-tensioning precast beams to precast columns using unbonded tendons are presented. The connections consist of precast beams which has steel cap at its ends and precast columns which has steel band at the connection region. The steel cap and steel band are used to reduce damage in the plastic hinge region of precast beams. Four test specimens were subjected to reversed cyclic loading and comparisons were made between the behavior of presented precast concrete specimens and conventional precast concrete specimen.
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The number of high-rise buildings and their corresponding height are increasing in the world. However, the highest building in the world with a load bearing precast structure is only 132m high (Het Strijkijzer in The Hague). Is this the maximum height of precast concrete or can we achieve greater heights with this building method? And how do the transport systems cope with the increased height of a precast structure? The feasibility of precast concrete in a high-rise building is investigated in this thesis by creating a structural and logistical design for the Zalmhaven tower (the reference project). By analysing and examining the differences between the precast and monolithic (cast in situ) structure, characteristic aspects of precast concrete have been denoted.
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The construction noise and wasted material of total precast concrete structure are reduced by factory production of components and assembled construction, green construction can be achieved.Combined with the first total precast parking structure in China, the connection modes of precast components are introduced,such as between precast columns and precast columns, between precast columns and precast inverted beams, between precast double tee slabs and precast columns or precast shear wall, which can provide a reference for the design of similar engineering.
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The advantages and disadvantages of precast concrete and cast-in-place concrete were compared.The classification of the various connections of precast concrete structures was summarized.The status of the latest development of the connection of precast concrete wall at home and abroad was introduced and analyzed.The key research problems and development trends were investigated.
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