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10th MATBUD’2023 Scientific-Technical Conference最新文献

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Three-Dimensional, Printable Paving Stone: A Preliminary Study 三维可打印铺路石:初步研究
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013018
V. Arslan, Z. Doğan
: Three-dimensional (3D) printing applications have emerged as a new production method in the construction industry. The materials that are to be used in 3D production process play an important role for a sustainable built environment. The main objective of this study is to design a suitable mixture to produce 3D printed concrete paving stones. In this respect, a unique 3D printer was also developed. The results show that the setting time of cement-based mortars was shortened by increasing the ratio of the added accelerator admixture. However, the optimum mixture proportions for 3D printed concrete paving stones were not reached. The results of the study are expected to develop a sustainable method of paving stone production.
三维(3D)打印应用已经成为建筑行业的一种新的生产方法。在3D生产过程中使用的材料对可持续建筑环境起着重要作用。本研究的主要目的是设计一种合适的混合物来生产3D打印混凝土铺路石。在这方面,还开发了一种独特的3D打印机。结果表明:增加促进剂掺量可缩短水泥基砂浆的凝结时间;然而,3D打印混凝土铺路石的最佳配合比并没有达到。这项研究的结果有望开发出一种可持续的铺路石生产方法。
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引用次数: 0
High-Strength Concrete Using Ash and Slag Cements 粉煤灰矿渣水泥高强混凝土
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013016
L. Dvorkin, V. Zhitkovsky, V. Marchuk, Ruslan Makarenko
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引用次数: 0
Effect of Low-Quality Calcined Clay on the Suppression of the Alkali–Silica Reaction 低质量煅烧粘土对碱-硅反应的抑制作用
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013015
D. Jóźwiak-Niedźwiedzka, R. Jaskulski, K. Dziedzic, A. Antolik
: This article presents the results of an experimental investigation into the mitigation of the alkali–silica reaction (ASR) resulting from using low-grade clay calcined at 850 ◦ C. The clay used in the experiment was domestic clay with an Al 2 O 3 content equal to 26% and a SiO 2 content of 58%. The performance of calcined clay in ASR mitigation was evaluated according to ASTM C1567 using reactive aggregates. The control mortar mixture consisted of 100% Portland cement (Na 2 O eq = 1.12%) binder and reactive aggregate. The test mixtures used the same reactive aggregate and binders, in which part of the cement was replaced with either 10%, 20% or 30% calcined clay. The microstructure of specimens was examined on the polished sections using a scanning electron microscope (SEM) operated in the backscattered mode (BSE). The results of expansion obtained from the mortar bars made with the reactive aggregate showed that replacing cement by calcined clay reduced their expansion, with the level of expansion decreasing with the increase in the level of cement replacement.
本文介绍了使用850℃煅烧的低品位粘土缓解碱-硅反应(ASR)的实验研究结果。实验中使用的粘土为国产粘土,al2o3含量为26%,sio2含量为58%。根据ASTM C1567使用反应性集料对煅烧粘土在ASR缓解中的性能进行了评估。对照砂浆由100%硅酸盐水泥(na2o eq = 1.12%)粘结剂和活性骨料组成。试验混合物使用相同的活性骨料和粘结剂,其中部分水泥用10%、20%或30%的煅烧粘土代替。使用背散射模式(BSE)的扫描电子显微镜(SEM)在抛光切片上观察样品的微观结构。用活性骨料制备砂浆棒的膨胀试验结果表明,用煅烧粘土代替水泥可降低砂浆棒的膨胀,膨胀程度随水泥替代量的增加而降低。
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引用次数: 1
Fire Resistance of Geopolymer Materials—A Change in Physical and Mechanical Properties 地聚合物材料的耐火性能——物理和机械性能的变化
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013007
Tarreck Mahaman Manssour Issa, K. Mróz, M. Sitarz, I. Hager, Ewa Słupska
: Geopolymers are new environmentally friendly cementitious materials that may offer an alternative to Ordinary Portland Cement. Not only do they have excellent mechanical properties, but they also have high temperature resistance. This research focuses on the high temperature exposure effect on geopolymer mortars. Two types of geopolymer mortars were prepared and exposed to different temperatures (20, 200, 400, 800 ◦ C). The main goal of this work is to assess the changes in the mechanical and physical properties of geopolymer mortars after being exposed to a high temperature. Two types of mixtures were tested: one containing 100% fly ash (M0-K) and the other one containing 50% fly ash and ground Granulated blast furnace slag (M50-K). The paper presents an evaluation of compressive and tensile strength, density, porosity, and ultrasonic pulse velocity for both M50-K and M0-K after exposure to high temperatures.
地聚合物是一种新型的环保胶凝材料,可以作为普通硅酸盐水泥的替代品。它们不仅具有优异的机械性能,而且还具有耐高温性能。研究了高温暴露对地聚合物砂浆的影响。制备了两种类型的地聚合物砂浆,并将其暴露在不同的温度下(20、200、400、800℃),本工作的主要目的是评估地聚合物砂浆在高温下的机械和物理性能的变化。试验了两种混合材料:一种是100%粉煤灰(M0-K),另一种是50%粉煤灰和磨粒高炉渣(M50-K)。本文介绍了M50-K和M0-K暴露于高温后的抗压和抗拉强度、密度、孔隙率和超声波脉冲速度的评估。
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引用次数: 0
Low Carbon Concrete Possibilities: EPD and Regulations in Northern Periphery and Arctic 低碳混凝土的可能性:北部边缘和北极地区的环境保护和法规
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013014
I. Nováková, P. Perumal, A. Ćwirzeń, O. Wallevik
: Concrete is one of the most common building materials in the Northern Periphery and Arctic, and therefore we should pay attention to its quality while reducing its carbon footprint. The concrete industry has established many measures to limit greenhouse gas emissions from concrete, as stated in the environmental product declaration (EPD). The most significant contributor is cement (common dose between 250 and 600 kg per 1 m 3 of concrete) in a concrete binder. Aside from the use of alternative fuels for cement production, new alternative materials for cement replacement are being sought. Those materials are called supplementary cementitious materials and mainly originate from industrial waste streams. Some of the materials are already standard and limited by the maximum allowed replacement, and some are new and still under investigation. The benefits and limitations of low-carbon concrete regulations in Norway, Sweden, Iceland, and Finland are demonstrated on three different concrete mixes in this article. The sorting of a reference mix and two low-carbon concrete mixes according to 4 different systems showed the informative character of the Icelandic system and the underestimation of possibilities for the carbon footprint of concrete in the Swedish classification system.
:混凝土是北部周边地区和北极地区最常见的建筑材料之一,因此我们应该在关注其质量的同时减少其碳足迹。正如环境产品声明(EPD)所述,混凝土行业已经制定了许多措施来限制混凝土的温室气体排放。最重要的贡献者是混凝土粘合剂中的水泥(通常剂量在每1立方米混凝土250至600公斤之间)。除了使用替代燃料生产水泥外,人们还在寻找替代水泥的新材料。这些材料被称为补充胶凝材料,主要来自工业废物流。有些材料已经是标准的,受到最大允许替换量的限制,有些是新的,仍在调查中。本文以三种不同的混凝土混合料为例,展示了挪威、瑞典、冰岛和芬兰的低碳混凝土法规的好处和局限性。根据4种不同的系统对一种参考配合比和两种低碳混凝土配合比进行分类,显示了冰岛系统的信息特征和瑞典分类系统对混凝土碳足迹可能性的低估。
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引用次数: 2
The Impact of Waste Fluid Catalytic Cracking Catalyst Addition on the Selected Properties of Cement Pastes 废液催化裂化催化剂添加量对水泥浆体性能选择的影响
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013010
Paweł Niewiadomski, Michał Cisiński
: The significant reduction in CO 2 emissions arising from the cementitious composites industry is one of the highest priorities for the construction sector’s movement towards climate neutrality and sustainable development. One of the approaches to cope with this issue is to partially substitute cement with supplementary cementitious materials. Recently, various oil refinery wastes (ORW) have attracted researchers’ attention in terms of being investigated for such an application. As such, the present paper shows the preliminary results of investigations conducted on cement pastes with the addition of a spent fluid catalytic cracking catalyst derived from a Polish oil refinery company. It is worth mentioning that the incorporation of ORW in cementitious composites might enable the production of more environmentally friendly construction materials without sacrificing quality, whilst, simultaneously providing an opportunity for recycling petrochemical wastes.
:水泥复合材料行业产生的二氧化碳排放量的显著减少是建筑行业走向气候中和和可持续发展的最高优先事项之一。解决这一问题的方法之一是用补充胶凝材料部分替代水泥。近年来,各种炼油废物(ORW)在这方面的应用研究引起了研究人员的关注。因此,本文展示了对水泥浆进行的初步研究结果,其中添加了来自波兰炼油厂公司的废流体催化裂化催化剂。值得一提的是,在胶凝复合材料中加入ORW可以在不牺牲质量的情况下生产更环保的建筑材料,同时为石化废物的回收提供了机会。
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引用次数: 1
Geopolymers Based on Fly Ash from the Bełchatów Power Plant 基于Bełchatów电厂飞灰的地聚合物
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013017
Agnieszka Bąk, Patrycja Bazan, K. Pławecka, M. Łach
: Geopolymer materials are attracting increasing interest from scientists due to their specific properties and the possibility of using waste materials from the power industry for their production. The most common raw material for their production is fly ash from the combustion of hard coal in pulverized coal boilers, but it is also possible to use ash from the combustion of lignite for this purpose. This article presents the results of a study of geopolymers produced with the use of ashes from lignite combustion at the Bełchat ó w Power Plant. It includes characterization of the ashes (laser particle size analysis, SEM/EDS morphology, XRD phase composition) and the strength properties of geopolymers made from these ashes and activated with 10 M and 14 M aqueous sodium hydroxide solution with water glass. As a result of this study, it was found that it is possible to obtain geopolymers characterized by flexural strength of almost 3 MPa and compressive strength of 30 MPa. A comparison of activators with concentrations of 10 M and 14 M made it possible to conclude that, due to the lack of significant differences in the properties of the obtained geopolymers, from an economic point of view, it is more advantageous in this case to use activators with a lower concentration.
地聚合物材料由于其特殊的性能和利用电力工业废料生产的可能性,正吸引着科学家们越来越多的兴趣。生产它们最常见的原料是煤粉锅炉中燃烧硬煤产生的飞灰,但也可以使用褐煤燃烧产生的灰来实现这一目的。本文介绍了利用Bełchat ó w电厂褐煤燃烧灰烬生产地聚合物的研究结果。它包括灰分的表征(激光粒度分析,SEM/EDS形貌,XRD相组成)和由这些灰分制成的地聚合物的强度性能,用10 M和14 M的氢氧化钠水溶液与水玻璃活化。研究结果表明,获得抗折强度接近3 MPa、抗压强度为30 MPa的地聚合物是可能的。通过对浓度为10 M和14 M的活化剂的比较,我们可以得出这样的结论:由于所获得的地聚合物的性质没有明显的差异,从经济的角度来看,在这种情况下使用浓度较低的活化剂更有利。
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引用次数: 0
Influence of Spent Fluid Catalytic Cracking Catalyst on the Properties of the New Binder Based on Fly Ash and Portland Cement 废液催化裂化催化剂对粉煤灰-硅酸盐水泥新型粘结剂性能的影响
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013008
J. Rakić, Z. Baščarević
: One of the measures to reduce the carbon footprint of the Portland cement (PC) manufacturing process is through a wider use of supplementary cementitious and waste materials. The main objective of this work was to produce a new binder using two different waste materials: fly ash (FA) from thermal power plants and spent fluid catalytic cracking catalyst (sFCCC) from petrol refineries. In order to improve their reactivity, both FA and sFCCC were mechanically activated prior to the preparation of the binder. The new binder consisted mostly of the waste materials (70 mass %), with PC as a minor component (30 mass %). It was found that using sFCCC as the binder component accelerated cement hydration and the pozzolanic reaction. The new binder had a shorter setting time and a higher early strength than the binder prepared without sFCCC
:减少波特兰水泥(PC)制造过程中碳足迹的措施之一是通过更广泛地使用补充胶凝剂和废料。这项工作的主要目的是利用两种不同的废物:火力发电厂的粉煤灰(FA)和炼油厂的废流体催化裂化催化剂(sFCCC)生产一种新的粘合剂。为了提高它们的反应性,在制备粘合剂之前,FA和sFCCC都被机械活化。新型粘结剂主要由废料(70%质量%)组成,PC为少量成分(30%质量%)。研究发现,使用sFCCC作为粘结剂组分,可加速水泥水化和火山灰反应。与未添加sFCCC的粘结剂相比,该粘结剂具有更短的凝固时间和更高的早期强度
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引用次数: 1
Effect of Potassium Formate on Alkali–Silica Reaction in Aggregates with Different Categories of Reactivity 甲酸钾对不同反应性聚集体碱-二氧化硅反应的影响
Pub Date : 2023-02-14 DOI: 10.3390/materproc2023013013
A. Antolik, D. Jóźwiak-Niedźwiedzka, K. Dziedzic, P. Lisowski
: During the wintertime, concrete pavements experience harsh exposure conditions due to the presence of both the freezing–thawing and wetting–drying cycles. Airport concrete pavements are commonly de-iced using chloride-free organic salts such as potassium formate or potassium acetate. However, these materials contain alkali ions which can have harmful effects on both the cement matrix and the aggregate. Specifically, there is an increased risk of occurrence of the alkali–silica reaction (ASR). The goal of this research was to estimate the influence of potassium formate on the potential of causing alkali–silica reaction in aggregates with different categories of reactivity (R0, R1, R2). The accelerated mortar bar test and its modification (which involves replacing sodium hydroxide solution with a potassium formate solution) were used. Detailed SEM-EDS examinations were performed to confirm the presence of alkali–silica reaction and to analyze the influence of potassium formate on the microstructure of mortar.
在冬季,由于冻融和干湿循环的存在,混凝土路面经历了严酷的暴露条件。机场混凝土路面通常使用无氯有机盐如甲酸钾或醋酸钾来除冰。然而,这些材料含有碱离子,对水泥基体和骨料都有有害的影响。特别是,发生碱-硅反应(ASR)的风险增加。本研究的目的是估计甲酸钾对不同反应活性(R0, R1, R2)的聚集体中引起碱-硅反应的潜力的影响。采用加速砂浆棒试验及其改性(用甲酸钾溶液代替氢氧化钠溶液)。通过详细的SEM-EDS测试,证实了碱-硅反应的存在,并分析了甲酸钾对砂浆微观结构的影响。
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引用次数: 0
A Study of Fly Ash-Based Geopolymers with Basalt Flour Addition 掺加玄武岩粉的粉煤灰基地聚合物的研究
Pub Date : 2023-02-13 DOI: 10.3390/materproc2023013003
B. Kozub, Krzysztof Miernik, S. Gądek
: The purpose of this study is to evaluate the effect of basalt flour addition, replacing quartz sand, and its proportion on fly ash-based geopolymers’ properties. As a base material, F-grade fly ash was used. The activation process was carried out using a 10 mol solution of sodium hydroxide and an aqueous solution of sodium silicate. The tests included measurements of density, compressive and flexural strength, abrasion resistance
摘要:研究了玄武岩粉的添加、石英砂的替代以及玄武岩粉的掺量对粉煤灰基地聚合物性能的影响。基材选用f级粉煤灰。活化过程采用10mol氢氧化钠溶液和水玻璃水溶液进行。测试包括测量密度,抗压和弯曲强度,耐磨性
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引用次数: 0
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10th MATBUD’2023 Scientific-Technical Conference
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