In this work it was studied the influence of recycled fine aggregate obtained from construction and demolition waste (CDW) on the rheological properties of Portland cement mortars. The CDW was initially separate in th...
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The use of natural fibers as an alternative of reinforcement for the structure of light weight concrete beam is highly encouraging. The use of natural fiber was chosen because of its easy availability; easy to process...
The use of natural fibers as an alternative of reinforcement for the structure of light weight concrete beam is highly encouraging. The use of natural fiber was chosen because of its easy availability; easy to process, abundant in number, renewable, inexpensive, and relatively high tensile strength. Indeed, it is an environmentally friendly material. One of natural fiber is skin of hibiscus. Hence, the objective of this study is to investigate the effect of reinforcement ratio of hibiscus skin with a resin coating towards the flexural strength of light concrete beam. This study was conducted at Laboratory Structures and Materials, Mataram University. The dimensions of concrete beams were 15× 20× 150 cm and the variation of tensile reinforcement from hibiscus skin were 3, 6, and 8 with a diameter of 12 mm. In addition, the ratio of reinforcement was 0,014; 0,031; and 0,046. The yield strength of hibiscus skin with a resin coating in tension was 43,67 MPa. Furthermore, the largest ultimate load (Pu) for the ratio reinforcement of 0,014; 0,031; and 0,046 were 7,564 kN, 12,811 kN, and 14,19 kN respectively. Meanwhile, the ultimate moments (Mu) were 2,125 kNm, 3,125 kNm and 3,625 kNm for for the ratio reinforcement of 0,014; 0,031; and 0,046 respectively. Therefore, the greater the ratio of the reinforcement results the higher of the load resistance. Thus, the hibiscus reinforcement has the ability to increase the beam resistance against the flexural load.
Developing countries are currently experiencing rapid urbanization due to economic growth which resulted in large scale of residential constructions including condominium. Despite its contribution to the society welfa...
Developing countries are currently experiencing rapid urbanization due to economic growth which resulted in large scale of residential constructions including condominium. Despite its contribution to the society welfare, condominium projects also create significant negative impacts on the environment through the consumption of non- renewable resources. Various methods, technologies as well as regulations have been employed to overcome the problem. However, the efforts to reduce the impacts, improve resource efficiency and promote sustainable construction were challenged by the fact that adopting sustainability will increase costs during investment phase, which is the main concern of most investors. In that respect, this paper was aimed to develop a dynamic hypothesis of sustainable construction which might be applicable for condominium project in developing countries, using a case study in Surabaya, Indonesia. System dynamic modelling was utilized to analyze the interrelationship among the controlling variables that influence system behavior of sustainable construction and project cost over a certain period. Variables were selected from previous literatures relevant to sustainable construction aspects. A questionnaire was then designed to collect experts’ perception on the influencing factors to sustainability in condominium projects. It included material and energy consumption, construction waste, lean construction method, use of green materials, indicators of sustainable construction and life cycle cost. The model obtained in this study was expected to be considered as a tool for improving sustainable construction while maintaining business objective in condominium project and formulating better policy to achieve economic, social and environmental sustainability target in the future.
Hospital El Salvador: a novel paradigm of intensive care in response to COVID-19 in central America. Lancet Glob Health 2021;9: e241?42?In this Comment, the conflict of interest statement should have included the foll...
Hospital El Salvador: a novel paradigm of intensive care in response to COVID-19 in central America. Lancet Glob Health 2021;9: e241?42?In this Comment, the conflict of interest statement should have included the following: ?By virtue of their roles within a public hospital or the Ministry of Health, MB, LC, WH, and XS are government employees. The findings and conclusions in the Comment are only those of the authors.? This correction has been made as of Feb 26, 2021.
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