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Materials
Published in Roy Chudley, Roger Greeno, Karl Kovac, Chudley and Greeno’s Building Construction Handbook, 2020
Roy Chudley, Roger Greeno, Karl Kovac
Wood cement board – approximately 25% wood particles mixed with water and cement, to produce a heavy and dense board often preferred to plasterboard and fibre cement for fire cladding. Often three-layer boards, from 6 to 40mm in thickness.
Foundations, Framing, Sheathing, and Vapor Barriers
Published in Kathleen Hess-Kosa, Building Materials, 2017
Cement board, also referred by trade name Hardibacker®, Durarock®, Wonderboard®, and Versarock®, is a Portland cement product. Cement board is made of a slurry of Portland cement, cellulose/glass fibers, filler (e.g., sand), additives, and water. Furthermore, some manufacturers identify sand in the ingredients listing on their MSDS—at levels as high as 50% by weight (e.g., Hardiebacker® cement board). The thin slurry is then poured into a form and pressed into and covered with a fiberglass mesh.
Experimental and numerical investigation of the mechanical properties of low cement thin boards reinforced by polypropylene and fiberglass mesh
Published in European Journal of Environmental and Civil Engineering, 2023
Ali Younesian, Mahmoud Nili, Alireza Azarioon, Sajad Shahriaripour
Traditionally, massive construction materials in external walls, such as bricks, and cement blocks, e.g., cause catastrophic accidents in buildings facing earthquakes. However, traditional systems are cheaper and more accessible, need excessive time for installation, consume extreme amounts of labor, and endanger residents of the building in massive events. They are not completely attached to structural elements and presumably collapse during earthquake shaking (ASCE, 2017) (Figure 1). High-profile catastrophic accidents, like the Sarpol-e Zahab earthquake in Iran (Zare et al., 2017), emphasize that massive materials may hurt residents by collapsing and causing heavy casualties. Therefore, the consumption of traditional materials, especially in seismic regions, is a predominant concern in the building's safety (ASCE, 2017; Sen et al., 2021; Zare et al., 2017). Despite the inevitable need for lightweight nonstructural elements like FCB in earthquake-prone areas, limited producers are accessible. According to the global cement report (Sen et al., 2021), there are about 90 cement board producers worldwide, among which Asia, the Middle East, and Africa include only 22 producers from this number. For this reason, traditional massive construction systems are still being used in many countries due to the inaccessibility of new materials like FCB. Non-local raw materials, expensive fibres, and mixing problems are the most noticeable difficulties, making FCB's industrialized production out of reach in developing/least-developed countries (Saunders & Davidson, 2014; Sengupta et al., 2018; Yudina, 2019).
DEM analysis of the evolution of reflection cracks in old cement concrete pavement with an ATB layer
Published in International Journal of Pavement Engineering, 2022
Zhongshi Pei, Junyan Yi, Qingyang Mao, Decheng Feng, Dongsheng Wang
When the temperature suddenly drops, the temperature shrinkage coefficients of the cement board and asphalt layer are inconsistent, leading to a difference in deformation between layers and resulting in the temperature shrinkage stress between the cement board and asphalt layer. When the temperature shrinkage stress exceeds the bottom tensile stress of the asphalt overlay layer, the asphalt layer will produce temperature reflective cracks. Therefore, in the process of simulating the reflection crack evolution of asphalt overlay under the action of thermal stress, a tensile force is applied to the cement concrete slab so that the cement concrete will undergo a continuous sinusoidal cyclic motion to characterise the thermal stress. The corresponding loading diagram is shown in Figure 9.
Estimating the performance of heavy impact sound insulation using empirical approaches
Published in Journal of Asian Architecture and Building Engineering, 2021
Jongwoo Cho, Hyun-Soo Lee, Moonseo Park, Kwonsik Song, Jaegon Kim, Nahyun Kwon
To obtain data corresponding to the selected explanatory variables, floating floor samples were prepared by varying the three components. First, the three sample floor types include raised floors using cement panels with a joint compound (i.e., Type A), battens/joists incorporating polypropylene (i.e., Type B), and a continuous layer of cement boards (i.e., Type C). Second, the resilient layer of samples consists of either a 12-mm-thick layer of polyurethane (PU), a 24-mm-thick PU layer, or a 24-mm-thick ethylene-vinyl acetate compound. The purpose of changing the resilient layer is to obtain several different values. Thus, the values of each resilient layer are measured according to ISO 9052–1 (ISO 9052-1 1989). Finally, the walking surface of samples consists of five thicknesses of cement board by varying the number of 12-mm-thick cement board stacks from zero to eight. Each cement board has a mass of 16.3 kg/m2. Therefore, the total sample size is 45 (composition of three floor types three resilient layers five walking surfaces). For each of these samples, the variables presented in Section 3.1.1 are derived and used to develop the estimation models. Figure 5 illustrates different floating floor samples depending on the substructure shape, resilient layer, and laminated mass.