Papyrus PressAdvance Researches in Civil Engineering2645-72295420231201Comparing the Performance of Steel, Wooden and Aluminum Beams in Structural Connections during Static Analysis1920701610.30469/arce.2024.449914.1071ENMasoudMahdaviFaculity of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran0009-0005-9385-7525Journal Article20240325Today, the use of alternative materials such as wood and composite materials in structures is one of the solutions of structural engineers. Reducing the consumption of steel in the structure reduces emissions and reduces the weight of the structure. Therefore, in the present paper, it is tried to model common connections in steel structures using ABAQUS software and finite element method (FEM). In the connections, it is tried to replace steel beams with wooden and aluminum beams in order to check their effect on the seismic performance of the connection. Connections are subjected to static loading. The results show that the steel beam has a much better performance compared to wooden and aluminum beams. But the wooden beam has a relatively good performance and can be used in steel structures. Numerical values of seismic parameters including von mises stress, displacement and support reaction force in wooden beam compared to steel beam were 20.71 times, 0.216 times and 0.828 times, respectively. It is suggested to use wooden composite beams in some steel structures and experimentally.https://www.arce.ir/article_207016_2aa38f241a433b2c0a5b17a6b122f2f5.pdfPapyrus PressAdvance Researches in Civil Engineering2645-72295420231201Multi-Criteria Optimization of Durability Properties of Self-Compacting Concrete Using Artificial Intelligence102320701710.30469/arce.2024.451053.1073ENSasanMotaghedAssistant Prof., Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, IranNasrollaEftekhariAssistant Prof., Faculty of Technology and Mining, Yasouj University, Choram, IranJournal Article20240405Permeability properties, mainly including migration, absorption, and diffusion, have been widely used to measure the durability of concrete. In this article, using the particle swarm optimization algorithm and based on the concept of Pareto optimization, the relations extracted from the results of the previous tests, and the optimal values of the constituents of self-compacting concrete to achieve the best durability are presented. Due to the lower amount of oxygen permeability in self-compacting concrete compared to SCC concrete with the same strength, Chlorine migration strongly depends on the type of filler. In this regard, durable concrete should have more filler. Pulverized fly ash (PFA) is a better filler to increase durability.https://www.arce.ir/article_207017_721698ddaa1bb91e0d9f64926549316b.pdfPapyrus PressAdvance Researches in Civil Engineering2645-72295420231201Compressive Strength of Steel Slag-based Geopolymer Concrete and Investigation of Influencing Factors243720701810.30469/arce.2024.453050.1074ENPayamKheirkhah HasankiadehDepartment of Civil Engineering, International University of Chabahar, Chabahar, Iran.MisaghMaleki SadrDepartment of Civil Engineering, International University of Chabahar, Chabahar, Iran.MohammadJamshidi AvanakiDepartment of Civil Engineering, International University of Chabahar, Chabahar, Iran.Amir BahadorMoradikhouDepartment of Civil Engineering, International University of Chabahar, Chabahar, Iran.Journal Article20240418In recent years, geopolymer has been introduced as a novel and green alternative to the Portland cement. Compressive strength is considered as one of the important characteristics of concrete. In geopolymer concretes, according to the ingredients, several factors have been identified as important parameters affecting the compressive strength. Hence, in this experimental research, several factors affecting the compressive strength steel slag-based geopolymer concrete including: the type of alkaline activator solution, the weight ratio of water to solid material participated in geopolymerization, sodium hydroxide concentration, the weight ratio of alkaline activator solution to aluminosilicate source and sodium silicate to sodium hydroxide weight, were studied. The obtained results indicated that using potassium hydroxide and potassium silicate as an alkaline activator solution, result in higher 28-day compressive strength of compare to sodium-based alkaline activator solution. On the other hand, using sodium hydroxide and sodium silicate as an alkaline activator solution, result in higher 3- and 7-day compressive strengths and also, faster hardening. Furthermore, increasing the weight ratio of water to solid material result in significant decreasing geopolymer concrete compressive strength. Also, compressive strength is increases with increase in concentration of sodium hydroxide up to 14 M, but for 16 M, there is no remarkable changes in compressive strength. The optimum ratio of alkaline activator solution to steel slag and sodium silicate to sodium hydroxide was measured 0.5 and 1.5, respectively.https://www.arce.ir/article_207018_ed1a535931647fbc2ceed4a1472635c3.pdfPapyrus PressAdvance Researches in Civil Engineering2645-72295420231201The Necessity of Reconsideration of the Evaluation Process for Sedimentary Rocks used in Construction Marine Protection Structures384720701910.30469/arce.2024.462121.1076ENMohammad MehdiPardsouiePh.D. candidate, Pars Geometry Consulting Engineers, Iran0000-0003-4693-7651Journal Article20240610One of the usual methods of building breakwaters in Iran is to use rock mass structures. Most of the rocks in the south of Iran are sedimentary (limestone, sandstone and lomashell). Most of the regulations in present codes regarding the usage of stone in hydraulic protection structures in other countries are mostly according to the availability and abundance of igneous rocks, as well as their own specific different geological conditions, so they have criteria’s that are more suitable for these types of rocks. In 2009, the regulations for the use of stone in breakwaters and protection structures were prepared to provide a codified standard for quality control during construction due to the extreme poverty of desirable stones in the south of Iran. Despite the promulgation of this regulation , the quality of construction in the majority of rock mass structures is still not favorable, the reasons for which can be attributed to: high abundance of harmful clay minerals within the range of extractable depth of the existing formations, high heterogeneity in the quality of the extracted rock, The extension of the life of the constructed structures beyond the initial assumptions of the design, the insufficiency of the existing standards for medium and long term serviceability, and in general the dominant effect of mineralogy on the overall performance of sedimentary rocks in rock mass structures . With regard to the mentioned cases, in this article, a new criterion for the classification of sedimentary rocks has been proposed.https://www.arce.ir/article_207019_d488c8b10e17a834105a5e8aa8fce712.pdfPapyrus PressAdvance Researches in Civil Engineering2645-72295420231201Managing Construction and Demolition Waste in Bangladesh: Obstacles and Enduring Remedies486020702010.30469/arce.2024.471534.1077ENAsif HossainAbirLocal Government Engineering DepartmentMehedi HasanBappyLocal Government Engineering DepartmentJournal Article20240803Bangladesh has experienced a remarkable surge in urbanization and growth over the past few decades. The metropolis of Dhaka is home to 30% of the nation's urban population. The construction industry in and around Dhaka has accelerated in response to the growing need for housing facilities to meet the demands of shelter for this large influx of people. This increased building has many negative effects on the environment and society, including waste generation. A nation's balanced development depends on its use of competitive, environmentally friendly, and sustainable building practices. As a result, proper handling of construction wastes is becoming a crucial concern. Wastes from construction and demolition make up a sizable portion of the waste stream that is dumped in the city's landfills. The majority of the time, construction waste management practices are appalling. It is time to consider taking some prompt action to put various management strategies into practice. Reviews of construction wastes, their production, and current management techniques were taken into consideration in this study. Lastly, suggestions from Bangladesh's perspective is given.https://www.arce.ir/article_207020_572582210c994a3d41e8e97e68fc0a30.pdf