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Recycling of Basalt and Limestone Cutting Dust in Concrete Mix Design 玄武岩和石灰石切割粉尘在混凝土配合比设计中的回收利用
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-010
Mohammad T. Awad, Ashraf Shaqadan, Jamal Al-Adwan, Faroq Maraqa
Objectives: The goal is to integrate stone cutting waste into the concrete manufacturing industry to reduce environmental degradation. Methods/Analysis: Two types of stone cutting waste (Basalt and limestone) were separately collected from local facilities. An experimental program was conducted to prepare concrete mixes with 10%, 20%, 30%, and 40% replacement of sand by the two types of stone powder. Physical and chemical quality testing was carried out on the water, aggregates, and cement used in the concrete mix. The experiment compared a standard concrete mix (0% replacement) consisting of 6 cylinders and 6 cubes with a mix of 24 cylinders and 24 cubes after 7 days and 28 days. Results: Compression, tension, and stress tests were performed on the produced specimens. Regarding basalt replacement, a 10% replacement showed a higher impact on compressive strength and tension. For limestone, the 10% and 40% replacement fractions exhibited an insignificant reduction in compressive strength, indicating that a 40% replacement of sand with limestone dust is practical for most applications. Replacing sand with stone cutting waste in concrete can bring several benefits to the environment and enhance project feasibility. Even a small fraction of replacement can improve concrete properties. Novelty:Protect natural sand mining causes damage to ecosystems, leading to erosion and loss of biodiversity. Doi: 10.28991/CEJ-2023-09-05-010 Full Text: PDF
目标:目标是将石材切割废料纳入混凝土制造行业,以减少环境退化。方法/分析:从当地设施中分别收集玄武岩和石灰石两类切割废料。进行了两种石粉替代10%、20%、30%、40%的混凝土配合比试验。对混凝土配合料中使用的水、骨料和水泥进行了理化质量检测。实验将6柱6立方的标准混凝土配合比(0%置换)与24柱24立方的配合比在7天和28天后进行对比。结果:对生产的样品进行了压缩、拉伸和应力测试。更换玄武岩时,更换10%对抗压强度和抗拉强度影响较大。对于石灰石,10%和40%的替代分数对抗压强度的降低并不显著,这表明用石灰石粉尘替代40%的沙子在大多数应用中是可行的。在混凝土中以碎石废料代替砂石,对环境有多方面的好处,提高了工程的可行性。即使是一小部分的替换也能改善混凝土的性能。新颖性:保护天然采砂对生态系统造成破坏,导致水土流失和生物多样性丧失。Doi: 10.28991/CEJ-2023-09-05-010全文:PDF
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引用次数: 0
Estimate Suitable Location of Solar Power Plants Distribution by GIS Spatial Analysis 利用GIS空间分析估算太阳能电站分布的适宜位置
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-013
B. A. Bedewy, Sophia Rezaq Ali Al-Timimy
This study proposes a model for the best investment in renewable energy plants that uses DEM, Spatial Analysis, and analysis of indicator weights by AHP to choose a suitable place to locate the solar plants, which increases their efficiency. This is because renewable energy is the most important component of future sustainability. In addition, the cities of Iraq, including Babylon, have increased the proportion of the population, which has led to high rates of urbanization and a lack of services. In particular, the need for services increased, especially electric power, which is characterized by its inefficiency and insufficiency. Yet, the governorate is a good source of solar energy and regular radiation. Therefore, the trend to use renewable energy is the optimal solution, and this manuscript proposes multiple criteria that can determine the optimal locations for building solar energy farms. So methods of analysis are the Digital Elevation Model (DEM), the slope of the earth, efficient distances from the city center, the main road networks and electricity distribution networks, and average solar brightness (hours/day) quantity. Finally, the spatial analysis of all indicators shows eight sites. By using criteria of analysis based on AHP analysis, the result is that six represent suitable sites chosen as sufficient space to locate solar plants. Consequently, the results of this manuscript for solar energy collection projects show percentages ranging between 2% and 37%, with areas starting with 10 ‎km2 and gradually rising towards the largest proposed area of 155 km2, distributed over the province so that the total proposed areas for solar energy collection projects will be about 422 km2. All that aim to achieve the best service in quality and quantity of renewable energy to establish sustainability and efficiency economic modeling in addition to increasing production efficiency. Doi: 10.28991/CEJ-2023-09-05-013 Full Text: PDF
本研究提出了一个可再生能源电站最佳投资模型,该模型采用DEM、Spatial Analysis和AHP法分析指标权重,选择合适的太阳能电站选址,从而提高太阳能电站的效率。这是因为可再生能源是未来可持续发展的最重要组成部分。此外,包括巴比伦在内的伊拉克城市增加了人口的比例,这导致了高城市化率和缺乏服务。特别是对服务的需求增加了,特别是电力,其特点是效率低下和不足。然而,该省是太阳能和常规辐射的良好来源。因此,使用可再生能源的趋势是最佳解决方案,本文提出了多种标准,可以确定建设太阳能发电场的最佳位置。因此,分析方法是数字高程模型(DEM),地球的坡度,到市中心的有效距离,主要道路网络和配电网络,以及平均太阳亮度(小时/天)数量。最后,所有指标的空间分析显示了八个站点。采用基于AHP分析的分析准则,选出6个合适的场地作为足够的空间来放置太阳能电站。因此,本文对太阳能收集项目的结果显示,太阳能收集项目的百分比在2%到37%之间,面积从10平方公里开始,逐渐增加到最大的建议面积155平方公里,分布在全省各地,因此太阳能收集项目的建议总面积约为422平方公里。所有这些都旨在实现可再生能源在质量和数量上的最佳服务,在提高生产效率的同时建立可持续和高效的经济模型。Doi: 10.28991/CEJ-2023-09-05-013全文:PDF
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引用次数: 2
Numerical Investigation of the Optimum Angle for Open Channel Junction 明渠结最佳角的数值研究
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-07
W. Hassan, Nidaa Ali Shabat
Numerous natural and artificial streams, including those for irrigation ditches, wastewater treatment facilities, and conveyance structures for fish movement, have open channel confluences. The flow dynamics at and around the junction are intricate; in particular, immediately downstream of the junction, the flow creates a zone of separation on the inner wall along with secondary recirculation patterns. The structure of this complicated flow depends on several factors, including the flow rates in both channels, the angle of confluence, the geometry of the channels, including the longitudinal slope and bed discordance, the roughness of the boundary, and the intensity of the turbulence. It also has a significant impact on bed erosion, bank scouring, etc. The objective of the current work is to calculate the velocity profile and the separation zone dimensions for four angles (30o, 45o, 60o, and 75o) through the simulation process, and the best angle using a three-dimensional model. This work gives a detailed application of the numerical solution (Finite Volume) via Flow 3D software. Results for two flow discharge ratios, q*=0.250 and q*=0.750 were shown; the numerical model and the experimental results agreed well. The findings are consistent with past research and demonstrate how the main channel flow pattern is affected by changes in the channel crossing angle, as well as how greater separation zones are produced in the main channel when the flow discharge ratio q* (main channel flow divided by total flow) is smaller. Analysis revealed that the separation zone's smallest diameter will be at the 75ocrossing angle. Doi: 10.28991/CEJ-2023-09-05-07 Full Text: PDF
许多天然和人工溪流,包括灌溉沟渠、废水处理设施和鱼类流动的运输结构,都有明渠汇合处。交界处及其周围的流动动力学是复杂的;特别是,在连接处的下游,流动在内壁上形成了一个分离区,伴随着二次再循环模式。这种复杂流动的结构取决于几个因素,包括两个通道的流速、合流角、通道的几何形状(包括纵向坡度和河床不一致)、边界的粗糙度和湍流的强度。它对河床侵蚀、河岸冲刷等也有显著影响。本次工作的目的是通过仿真过程计算出300度、45度、60度和75度四个角度的速度剖面和分离带尺寸,并利用三维模型计算出最佳角度。本文通过Flow 3D软件给出了数值解(有限体积)的详细应用。给出了两种流量比q*=0.250和q*=0.750的结果;数值模型与实验结果吻合较好。研究结果与以往的研究结果一致,证明了主河道的流型受河道过流角变化的影响,以及当流量比q*(主河道流量除以总流量)越小时,主河道内产生的分离带越大。分析表明,分离带的最小直径将在75相交角处。Doi: 10.28991/CEJ-2023-09-05-07全文:PDF
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引用次数: 0
Shear Behavior of Reinforced Concrete Inverted-T Deep Beam 钢筋混凝土倒t型深梁抗剪性能研究
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-04
H. Shousha, R. Mabrouk, A. Torkey
Contrary to top-loaded deep beams, Inverted-T (IT) deep beams are loaded on ledges at the beam’s bottom chord. The presence of the load near the bottom of the beams creates a tension field in the web at the loading points. An experimental investigation was carried out in which 8 specimens of reinforced concrete IT deep beams were tested and the effect of the following variables was studied: changing the hanger diameter, hanger arrangement in terms of spacing and distribution distance, hanger reinforcement ratio, vertical and horizontal web shear reinforcement diameter, and spacing. In addition, all the tested beams had long ledges extending to the end of the beam. It was concluded that hanger reinforcement diameter and horizontal web shear reinforcement have an insignificant effect on the IT deep beam capacity. While the change in hanger arrangement, vertical web reinforcement, and ledge length has a significant effect on IT deep beam capacity. The maximum spacing of the hanger reinforcement and the minimum hanger reinforcement ratio passing through the load plate length will be studied in the following publication. A finite element model (FEM) was presented to predict the behavior of IT deep beams. The simulation was carried out using the ABAQUS 2017 software program. The results of the numerical model showed good agreement with the experimental program. Analysis using design codes was checked against the experimental data, where the computed beam capacities were compared to those obtained from the test results. The comparison showed a remarkable difference between the predictions using the design codes and the test results. Computation using design codes significantly underestimated the capacities of the beams. Doi: 10.28991/CEJ-2023-09-05-04 Full Text: PDF
与顶荷载深梁相反,倒t型深梁是在梁的底部弦架上荷载的。靠近梁底部的荷载在腹板的荷载点处产生张力场。通过8个钢筋混凝土IT深梁试件的试验研究,研究了改变吊架直径、吊架布置间距和分布距离、吊架配筋率、纵横腹板剪力配筋直径和间距对吊架直径的影响。此外,所有测试梁都有延伸到梁末端的长壁架。结果表明,吊架配筋直径和水平腹板剪力配筋对It深梁承载力影响不显著。吊架布置方式、腹板竖向配筋和壁架长度的变化对IT深梁承载力有显著影响。吊架加固的最大间距和通过荷载板长度的最小吊架加固比将在下面的出版物中进行研究。提出了一种预测IT深梁性能的有限元模型。采用ABAQUS 2017软件程序进行仿真。数值模拟结果与实验结果吻合较好。使用设计规范的分析与实验数据进行了核对,其中计算的梁容量与从测试结果中获得的梁容量进行了比较。比较表明,采用设计规范的预测结果与试验结果之间存在显著差异。使用设计规范的计算大大低估了梁的能力。Doi: 10.28991/CEJ-2023-09-05-04全文:PDF
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引用次数: 0
Applying the Porosity-to-Cement Index for Estimating the Mechanical Strength, Durability, and Microstructure of Artificially Cemented Soil 应用水泥孔隙率指数估算人工胶结土的机械强度、耐久性和微观结构
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-02
Jair Arrieta-Baldovino, R. Izzo, Carlos Millan-Paramo
Fine, expansive, and problematic soils cannot be used in fills or paving layers. Through additions to these soils, they can be converted into technically usable materials in civil construction. One methodology to make them viable for construction is through a stabilization process. Nevertheless, current methodologies regarding dosage based on compaction effort and the volumetric amount of binder used are unclear. Thus, this research describes cement-stabilized sedimentary silt's strength and durability properties from Curitiba (Brazil) for future application in paving. Splitting tensile strength, unconfined compressive strength, and loss of mass against wetting and drying cycles (W-D) were investigated in the laboratory utilizing greenish-gray silt (originating from one of the Guabirotuba Formation layers, Paraná) and high-early strength Portland cement- ARI (CPV). Utilized were cement concentrations (C) of 3, 5, 7, and 9%, molding dry unit weights (d) of 14, 15, and 16 kN/m3, curing periods (t) of 7, 14, and 28 days, and constant moisture content (w) of 23%. With an increase in cement concentration and curing time, the compacted mixes demonstrate an increase in strength, an improvement in microstructure, and a decrease in accumulated mass loss (ALM) and initial porosity (η). Using the porosity/volumetric cement content ratio (η/Civ), the lowest amount of cement required to stabilize the soil in terms of strength and durability was determined. The porosity/cement index provided an appropriate parameter for modeling the mechanical and durability properties, and a unique equation between the strength/accumulated loss of mass and the porosity/binder index was obtained for the curing times studied. Lastly, C = 5% by weight is the minimum acceptable amount for prospective subbase soil application. Doi: 10.28991/CEJ-2023-09-05-02 Full Text: PDF
细、膨胀和有问题的土壤不能用于填充物或铺装层。通过添加这些土壤,它们可以转化为民用建筑中技术上可用的材料。一种使它们能够施工的方法是通过稳定过程。然而,目前关于基于压实努力和使用粘合剂的体积量的剂量的方法尚不清楚。因此,本研究描述了来自巴西库里蒂巴(Curitiba)的水泥稳定沉积粉土的强度和耐久性特性,以供未来在铺装中的应用。劈裂抗拉强度、无侧限抗压强度和湿、干循环下的质量损失(W-D)在实验室进行了研究,使用的是绿灰色泥沙(来自瓜比罗图巴地层之一,paran)和高早强度波特兰水泥- ARI (CPV)。所使用的水泥浓度(C)分别为3,5,7和9%,成型干重(d)分别为14,15和16 kN/m3,养护时间(t)分别为7,14和28天,恒定含水率(w)为23%。随着水泥浓度的增加和养护时间的延长,压实混合料的强度增加,微观结构改善,累积质量损失(ALM)和初始孔隙率(η)降低。通过孔隙率/体积水泥掺量比(η/Civ),确定了稳定土体强度和耐久性所需的最低水泥用量。孔隙度/胶结指数为模拟混凝土的力学性能和耐久性提供了合适的参数,并在研究的养护时间内得到了强度/累积质量损失量与孔隙度/胶结指数之间的独特方程。最后,C = 5%的重量是最低可接受的量为潜在的基层土壤应用。Doi: 10.28991/CEJ-2023-09-05-02全文:PDF
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引用次数: 0
Properties of Palm Oil Ash Geopolymer Containing Alumina Powder and Field Para Rubber Latex 含氧化铝粉和田间对位胶乳的棕榈油灰分地聚合物的性能
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-017
Abideng Hawa, Preecha Salaemae, Akkadath Abdulmatin, Krittiya Ongwuttiwat, Woraphot Prachasearee
Most geopolymer binder is produced using raw materials comprising powder with high silica and alumina content. Additionally, fine aggregate is prepared with river sand for high bulk density. This research proposes using palm oil ash (POA) for the main binder and palm oil clinker (POC) for the fine aggregate. The chemical composition of POA has high levels of silica but low alumina, so it must undergo partial replacement with alumina powder (AP). POA and POC are waste by-products of electrical power plants. The properties to be investigated include compressive strength, bulk density, water absorption, and microstructure. The effect of mixture composition, i.e., POA and field Para rubber latex (FPRL), on those properties is of particular interest. POA was substituted by AP and FPRL at 2.5%, 5%, 7.5%, and 10%, and at 1%, 3%, 5%, and 10%, respectively. Geopolymer mortars were cured at ambient temperature for 24 hours and kept at ambient temperature until testing. The compressive strengths of the geopolymer mortars were tested at 1, 7, and 28 days. The results showed that the optimal mixture consisted of 5% AP in the case of AP only and 1% FPRL in the case of FPRL only, while the ternary optimal mixture of 1% FPRL and 7.5% AP achieved higher compressive strengths than the control (CT) sample at 28.16, 19.98, and 25.30 MPa, respectively, after 28 days of curing. Bulk density increased with the addition of AP and FPRL. The microstructures of the geopolymer samples investigated using SEM-EDX showed the presence of different elements with different mixtures and displayed a dense, compact geopolymer matrix with high compressive strength. Using large amounts of POA in combination with AP and FPRL improved the environmental aspects of landfill disposal. Doi: 10.28991/CEJ-2023-09-05-017 Full Text: PDF
大多数地聚合物粘结剂是用含有高硅和高铝含量的粉末的原料生产的。此外,用河砂配制细骨料,具有较高的堆积密度。本研究提出以棕榈油灰分(POA)为主要粘结剂,棕榈油熟料(POC)为细骨料。POA的化学成分硅含量高,氧化铝含量低,因此必须用氧化铝粉(AP)部分替代。POA和POC是发电厂的废物副产品。要研究的性能包括抗压强度、体积密度、吸水率和微观结构。混合成分的影响,即POA和场对位橡胶乳胶(FPRL),对这些性能特别感兴趣。AP和FPRL分别以2.5%、5%、7.5%和10%以及1%、3%、5%和10%取代POA。地聚合物砂浆在常温下固化24小时,并在常温下保持至试验。在1、7、28天测试了地聚合物砂浆的抗压强度。结果表明:在仅添加AP时,掺5% AP;在仅添加FPRL时,掺1% FPRL;在养护28 d后,掺1% FPRL和7.5% AP的三元优化混合物的抗压强度分别达到28.16、19.98和25.30 MPa,高于对照(CT)样品。随着AP和FPRL的加入,堆积密度增加。利用SEM-EDX对地聚合物样品的微观结构进行了研究,发现不同元素以不同的混合物存在,呈现出致密、致密、抗压强度高的地聚合物基质。将大量的POA与AP和FPRL结合使用,可改善堆填区的环境问题。Doi: 10.28991/CEJ-2023-09-05-017全文:PDF
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引用次数: 0
Indoor Climate Prediction Using Attention-Based Sequence-to-Sequence Neural Network 基于注意力的序列对序列神经网络的室内气候预测
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-06
Karli Eka Setiawan, G. N. Elwirehardja, B. Pardamean
The Solar Dryer Dome (SDD), a solar-powered agronomic facility for drying, retaining, and processing comestible commodities, needs smart systems for optimizing its energy consumption. Therefore, indoor condition variables such as temperature and relative humidity need to be forecasted so that actuators can be scheduled, as the largest energy usage originates from actuator activities such as heaters for increasing indoor temperature and dehumidifiers for maintaining optimal indoor humidity. To build such forecasting systems, prediction models based on deep learning for sequence-to-sequence cases were developed in this research, which may bring future benefits for assisting the SDDs and greenhouses in reducing energy consumption. This research experimented with the complex publicly available indoor climate dataset, the Room Climate dataset, which can be represented as environmental conditions inside an SDD. The main contribution of this research was the implementation of the Luong attention mechanism, which is commonly applied in Natural Language Processing (NLP) research, in time series prediction research by proposing two models with the Luong attention-based sequence-to-sequence (seq2seq) architecture with GRU and LSTM as encoder and decoder layers. The proposed models outperformed the adapted LSTM and GRU baseline models. The implementation of Luong attention had been proven capable of increasing the accuracy of the seq2seq LSTM model by reducing its test MAE by 0.00847 and RMSE by 0.00962 on average for predicting indoor temperature, as well as decreasing 0.068046 MAE and 0.095535 RMSE for predicting indoor humidity. The application of Luong's attention also improved the accuracy of the seq2seq GRU model by reducing the error by 0.01163 in MAE and 0.021996 in RMSE for indoor humidity. However, the implementation of Luong attention in seq2seq GRU for predicting indoor temperature showed inconsistent results by reducing approximately 0.003193 MAE and increasing roughly 0.01049 RMSE. Doi: 10.28991/CEJ-2023-09-05-06 Full Text: PDF
太阳能烘干机圆顶(SDD)是一种太阳能农业设施,用于干燥、保存和加工可食用商品,需要智能系统来优化其能源消耗。因此,需要预测温度和相对湿度等室内条件变量,以便对执行器进行调度,因为最大的能源消耗来自执行器活动,例如用于提高室内温度的加热器和用于保持最佳室内湿度的除湿器。为了构建这样的预测系统,本研究开发了基于序列到序列案例的深度学习预测模型,该模型在未来可能会为辅助SDDs和温室降低能耗带来效益。本研究使用复杂的公开室内气候数据集Room climate数据集进行实验,该数据集可以表示为SDD内部的环境条件。本研究的主要贡献是在时间序列预测研究中实现了常用于自然语言处理(NLP)研究的Luong注意机制,提出了两个基于Luong注意的序列到序列(seq2seq)架构模型,GRU和LSTM分别作为编码器和解码器层。该模型优于自适应LSTM和GRU基线模型。Luong attention的实现可以提高seq2seq LSTM模型预测室内温度的平均测试MAE和RMSE分别降低0.00847和0.00962,以及预测室内湿度的平均测试MAE和RMSE分别降低0.068046和0.095535。应用Luong的注意力也提高了seq2seq GRU模型的精度,室内湿度的MAE误差降低了0.01163,RMSE误差降低了0.021996。然而,在seq2seq GRU中使用Luong attention预测室内温度,结果不一致,减少了大约0.003193 MAE,增加了大约0.01049 RMSE。Doi: 10.28991/CEJ-2023-09-05-06全文:PDF
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引用次数: 0
An Investigation on Eco Friendly Self-Compacting Concrete Using Spent Catalyst and Development of Structural Elements 废催化剂环保型自密实混凝土研究及结构元件开发
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-08
B. R., Ranya Al-Balushi, Asima Kaleem
The theme of this initiative is "Waste to Wealth." Construction materials, particularly concrete, need to have better qualities, including strength, rigidity, durability, and ductility, because Oman's construction industry is expanding. Self-compacting concrete (SCC) has more benefits than regular concrete, including better workability. The major focus of this study is the C30-grade SCC for the control mix, spent catalyst (zeolite catalyst)-based SCC, and the development of the RC beam's flexural behavior employing control and spent catalyst-based SCC. The preliminary study and the main study are the two study outcomes included in this project. Preliminary research involves creating four mixtures with various dosages of 3%, 6%, 9%, and 12% in order to optimize spent catalyst in C30 grade concrete. All of the cubes undergo a 28-day curing test. The cubes' compressive strength is tested in order to establish the ideal dosage, which is 9%. Develop a C30 grade control modified design mix in accordance with SCC and optimize chemical admixtures such as superplasticizer (SP) at different dosages, like 2, 2.5, 3, and 3.5%, using various trials and tests (slump flow, L-box, J-ring, V-funnel, and U-box tests), as well as the optimized dosage of spent catalyst (SC). The main study includes six singly reinforced RC beams with dimensions of 750 (L)×100 (B)×150 mm (D) that were cast and tested in the laboratory. After a 28-day curing period, two specimens were placed under a two-point loading setup, with the remaining two samples receiving the optimum dosages of spent catalyst and superplasticizer. All of the beams were tested using a Universal Testing Machine (UTM) with a 1000 kN capability. From the preliminary study, partial substitution of cement in control concrete of grade C30 using spent catalyst (SC), it was found that the 9% optimum dosage produces greater compressive strength compared to other doses, which are almost 10% rises at 28 days of curing period. Based on a different test, it was discovered that the optimum dose of 3% SP gave closer agreement and satisfied the need for SCC as per the BS standard. The load-carrying capability of the SCC beams is almost 21.7% higher than that of the control beams. Comparing the SCC beams to the control beams, their deflection was reduced by about 26% at the same load level, and their ductility rose by almost 33%. Comparatively to the control beam, the stiffness of 21.6% of SCC also rises. According to test results, the SCC beam performs better in every way when superplasticizer and spent catalyst are used at the recommended dosage. Doi: 10.28991/CEJ-2023-09-05-08 Full Text: PDF
这次活动的主题是“从浪费到财富”。建筑材料,特别是混凝土,需要有更好的质量,包括强度、刚度、耐久性和延展性,因为阿曼的建筑业正在扩张。自密实混凝土(SCC)比普通混凝土具有更多的优点,包括更好的和易性。本研究的主要重点是用于控制混合物的c30级SCC,基于废催化剂(沸石催化剂)的SCC,以及使用控制和基于废催化剂的SCC开发RC梁的弯曲行为。初步研究和主要研究是本项目纳入的两个研究成果。初步研究包括创建四种不同剂量的混合物,分别为3%、6%、9%和12%,以优化C30级混凝土中的废催化剂。所有的立方体都要经过28天的固化测试。通过对立方体抗压强度的试验,确定了理想的添加量为9%。根据SCC制定C30级控制改进设计混合物,并通过各种试验和测试(坍落度流、l -箱、j -环、v -漏斗和u -箱试验)优化不同剂量的化学外加剂,如高效减水剂(SP),以及废催化剂(SC)的优化剂量。主要研究包括六个单钢筋混凝土梁,尺寸为750 (L)×100 (B)×150 mm (D),浇铸并在实验室进行测试。在28天的养护期后,将两个样品置于两点加载装置下,其余两个样品接受最佳剂量的废催化剂和高效减水剂。所有梁都使用具有1000千牛能力的通用试验机(UTM)进行测试。通过前期研究,用废催化剂(SC)部分替代C30级对照混凝土中的水泥,发现9%的最佳掺量比其他掺量产生更大的抗压强度,在养护28天时,抗压强度提高了近10%。根据另一项试验,发现3% SP的最佳剂量更符合BS标准,满足SCC的需要。SCC梁的承载能力比对照梁提高了21.7%。与对照梁相比,在相同荷载水平下,SCC梁的挠度降低了约26%,延性提高了近33%。与对照梁相比,其刚度也提高了21.6%。试验结果表明,在推荐用量下使用高效减水剂和废催化剂时,SCC梁的各项性能都较好。Doi: 10.28991/CEJ-2023-09-05-08全文:PDF
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引用次数: 0
Prediction of Energy Consumption of an Administrative Building using Machine Learning and Statistical Methods 基于机器学习和统计方法的行政大楼能耗预测
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-01
Meryem El Alaoui, Laila Ouazzani Chahidi, Mohammed Rougui, Abdeghafour Lamrani, A. Mechaqrane
Energy management is now essential in light of the current energy issues, particularly in the building industry, which accounts for a sizable amount of global energy use. Predicting energy consumption is of great interest in developing an effective energy management strategy. This study aims to prove the outperformance of machine learning models over SARIMA models in predicting heating energy usage in an administrative building in Chefchaouen City, Morocco. It also highlights the effectiveness of SARIMA models in predicting energy with limited data size in the training phase. The prediction is carried out using machine learning (artificial neural networks, bagging trees, boosting trees, and support vector machines) and statistical methods (14 SARIMA models). To build the models, external temperature, internal temperature, solar radiation, and the factor of time are selected as model inputs. Building energy simulation is conducted in the TRNSYS environment to generate a database for the training and validation of the models. The models' performances are compared based on three statistical indicators: normalized root mean square error (nRMSE), mean average error (MAE), and correlation coefficient (R). The results show that all studied models have good accuracy, with a correlation coefficient of 0.90 < R < 0.97. The artificial neural network outperforms all other models (R=0.97, nRMSE=12.60%, MAE= 0.19 kWh). Although machine learning methods, in general terms, seemingly outperform statistical methods, it is worth noting that SARIMA models reached good prediction accuracy without requiring too much data in the training phase. Doi: 10.28991/CEJ-2023-09-05-01 Full Text: PDF
鉴于目前的能源问题,特别是在占全球能源使用量相当大的建筑行业,能源管理现在是必不可少的。预测能源消耗对于制定有效的能源管理战略具有重要意义。本研究旨在证明机器学习模型在预测摩洛哥舍夫沙万市一座行政大楼的供暖能源使用方面优于SARIMA模型。它还强调了SARIMA模型在训练阶段有限数据量下预测能量的有效性。预测使用机器学习(人工神经网络、套袋树、提升树和支持向量机)和统计方法(14个SARIMA模型)进行。为了建立模型,选择外部温度、内部温度、太阳辐射和时间因子作为模型输入。在TRNSYS环境中进行建筑能耗仿真,生成用于模型训练和验证的数据库。通过归一化均方根误差(nRMSE)、平均误差(MAE)和相关系数(R)三个统计指标对模型的性能进行比较,结果表明,所研究的模型均具有较好的准确性,相关系数为0.90 < R < 0.97。人工神经网络优于所有其他模型(R=0.97, nRMSE=12.60%, MAE= 0.19 kWh)。虽然总的来说,机器学习方法似乎优于统计方法,但值得注意的是,SARIMA模型在训练阶段不需要太多数据的情况下达到了很好的预测精度。Doi: 10.28991/CEJ-2023-09-05-01全文:PDF
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引用次数: 1
Deterministic Seismic Hazard Analysis to Determine Liquefaction Potential Due to Earthquake 确定地震液化潜力的确定性地震危害分析
Q3 Engineering Pub Date : 2023-05-01 DOI: 10.28991/cej-2023-09-05-012
K. A. Hanindya, L. Makrup, .. Widodo, R. Paulus
The great rocking of building structures and the occurrence of liquefaction in water-saturated soil on river banks are generally caused by earthquake shaking. The waves generated by the earthquake are the main cause of the shaking. In order to show the effect of ground motion earthquake shaking on the response of structures and liquefaction processes, it is necessary to analyze the structure and liquefaction as well as the time history of artificial earthquake ground motions. An artificial time history for liquefaction analysis can be developed based on spectral matching to the target spectrum generated by a deterministic seismic hazard analysis. Therefore, the time history recovered from the analysis can be said to be derived from a deterministic procedure. The analysis of liquefaction with time history aims to see the potential for liquefaction in the Palu region of Central Sulawesi by developing the time history of the bedrock. The time history of the bedrock is then spread over the ground surface. The propagation of time-historical waves to the ground surface can cause liquefaction events in the soil layer. It was found that liquefaction occurred in the Palu region, especially in the Anutapura Hospital building. No other liquefaction potential analysis studies were found in the region. Doi: 10.28991/CEJ-2023-09-05-012 Full Text: PDF
河岸建筑结构的剧烈晃动和饱和水土液化的发生,一般都是由地震引起的。地震产生的波浪是造成震动的主要原因。为了揭示地震动对结构响应和液化过程的影响,有必要对结构和液化过程以及人工地震地震动时程进行分析。基于与确定性地震危险性分析生成的目标谱的谱匹配,可以建立液化分析的人工时程。因此,从分析中恢复的时间历史可以说是从确定性过程中得出的。液化的时间历史分析旨在通过发展基岩的时间历史来了解苏拉威西岛中部帕卢地区液化的潜力。基岩的时间历史就会在地表上展开。时程波向地表的传播会引起土层的液化事件。据发现,液化发生在帕卢地区,特别是在阿努塔普拉医院大楼。该地区未发现其他液化潜力分析研究。Doi: 10.28991/CEJ-2023-09-05-012全文:PDF
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引用次数: 0
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Open Civil Engineering Journal
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