Cement Wapno Beton最新文献_第6页

Effect of temperature on the long-term properties of mortars containing waste glass powder and ground granulated blast furnace slag 温度对含废玻璃粉和磨粒矿渣砂浆长期性能的影响

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.1

Jakub Szydłowski, Wojciech Szudek, Ł. Gołek

{"title":"Effect of temperature on the long-term properties of mortars containing waste glass powder and ground granulated blast furnace slag","authors":"Jakub Szydłowski, Wojciech Szudek, Ł. Gołek","doi":"10.32047/cwb.2021.26.4.1","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.4.1","url":null,"abstract":"The paper presents new and unique results of two-year examinations of mortars containing ground glass, as a substitute for 15 or 30% by mass of ordinary Portland cement in comparison with the properties of mortars with the analogous addition of ground granulated blast furnace slag, in different temperatures. Moreover, after a two-year curing period, the mortars were autoclaved. Samples were subjected to compressive strength measurements, XRD analysis and the determination of calcium hydroxide content, by means of thermogravimetric analysis. The results confirm that as an additive, glass powder, thanks to its pozzolanic properties, can compete with common SCMs like granulated blast furnace slag. Additionally, a reduction in strength was not observed after the autoclaving process, for the mortars with 15% glass addition. The data collected in the paper confirms that the pozzolanic properties of ground glass allows its use as an additive. It also shows the ability of these mortars to maintain a constant level of strength in the long term and even after the autoclaving of two-year-old samples","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"4 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76375205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Microstructure and properties of geopolymers formed in the alkali activation process of fly ash 粉煤灰碱活化过程中形成的地聚合物的微观结构和性能

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.2

K. Rajczyk, Grzegorz Janus

引用次数: 0

Particles spasing of supplementary cementitious materials in binary blended cements 二元混合水泥中补充胶凝材料的颗粒间距

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.5.1

Guillermina Marchetti, Antonella Di Salvo Barsi, V. Rahhal, Egdardo Irassar

引用次数: 0

Experimental and numerical study of fiber reinforced concrete beams in four-point bending 纤维混凝土梁四点弯曲试验与数值研究

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.5.6

R. Tuğrul Erdem

引用次数: 0

Unground granulated slag as a substitute for natural aggregate during concrete production 在混凝土生产中，未磨碎的矿渣作为天然骨料的替代品

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.3.2

S. Krispel, Helga Zeitlhofer, M. Peyerl

{"title":"Unground granulated slag as a substitute for natural aggregate during concrete production","authors":"S. Krispel, Helga Zeitlhofer, M. Peyerl","doi":"10.32047/cwb.2021.26.3.2","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.3.2","url":null,"abstract":"In order to evaluate the usefulness of unground granulated slag for the concrete production, as the partial replacement of fine aggregate – namely sand, the detailed studies of the influence of this addition on the properties of the fresh and hardened concrete were conducted. These studies included the compression strength and the modulus of elasticity determination, as well as the evaluation of durability by the determination of frost resistance. The evaluation of the properties of concretes hardened under winter conditions, at +10oC and summer conditions at +20oC. These studies also covered the resistance to chloride attack and carbonization. The long-lasting examination covered also the ASR. At the end, under real construction conditions in the Austrian prefabrication plant, the unground granulated slag was examined. Under these conditions especially the long-lasting measurements of the strength development of the precast elements were verifi ed. In order to evaluate the usefulness of the unground granulated slag, as partial replacement of fine aggregate, the concretes with the additions of slag of 10% and 15% were produced and examined. For this evaluation, the slags of two Austrian plants from Upper Austria and Styria were used. The old and fresh slags from these two plants were used because the old slags can also be adopted for concrete production. Presented in the paper results are confi rming that the natural aggregate of the fraction < 4 mm can be successfully replaced by unground granulated slag, without any negative influence on the properties of concrete.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"134 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74546494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilization of ground waste glass cullet in the industrial production of precast concrete elements 地面废玻璃屑在混凝土预制构件工业生产中的利用

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.2.6

Ł. Gołek, Wojciech Szudek, G. Łój

{"title":"Utilization of ground waste glass cullet in the industrial production of precast concrete elements","authors":"Ł. Gołek, Wojciech Szudek, G. Łój","doi":"10.32047/cwb.2021.26.2.6","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.2.6","url":null,"abstract":"In the study, a field trial was carried out to evaluate the applicability of ground waste glass cullet as a binder component, in the industrial production of precast concrete elements. The influence of glass cullet addition on the properties of fresh and hardened concretes was compared to siliceous fly ash. Moreover, the effects of a partial substitution of the natural aggregate with recycled concrete and expanded clay aggregate were determined. The compressive strength of concretes, in which 25% of cement was substituted with ground waste glass cullet, was even 20% higher compared to elements with an analogous addition of siliceous fly ash. Over 56 days, no drops in strength related to the harmful effects of the alkali-silica reaction were observed. Replacing half of the natural aggregate with graded recycled concrete aggregate, allowed to lower the thermal conductivity of the walls by approx. 10%, with no negative impact on the compressive strength of precast elements. However, a decrease in the consistency of fresh mix was observed after 30 minutes. Replacing the 2÷8 mm gravel with the same fraction of expanded clay resulted in an approx. 18% decrease in thermal conductivity, while maintaining satisfactory mechanical properties. It was concluded that ground waste glass cullet can be successfully used as a fly ash replacement in the production of precast concrete elements.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"90 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84545711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Elevated temperature study on geopolymer concrete with ferrochrome slag aggregates 铬铁渣骨料地聚合物混凝土的高温研究

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.6

P. Indu, S. Greeshma

引用次数: 2

Properties of alkali-activated roller compacted concretes produced from waste aggregates 废骨料生产碱活化碾压混凝土的性能研究

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.7

Saadet Gökçe Gök, I. Kilic, O. Sengul

{"title":"Properties of alkali-activated roller compacted concretes produced from waste aggregates","authors":"Saadet Gökçe Gök, I. Kilic, O. Sengul","doi":"10.32047/cwb.2021.26.4.7","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.4.7","url":null,"abstract":"The energy consumption and the release of carbon dioxide during cement production require the search for alternative building materials. There is an increasing need for more environmentally friendly, more economical, durable and high-strength materials. Studies on recycling of waste materials in construction contribute to meeting this need. In this study, a new material that allows reuse of wastes was produced using known materials and techniques. Alkali-activated roller compacted concrete [AARCC] was produced with recycled coarse aggregates and the mechanical properties of this material were investigated. In this experimental study, the objective was to produce an alternative construction material composed of waste or by-products. Ground granulated blast furnace slag [GGBFS] was activated with a sodium silicate [Na2SiO3] and 10 M sodium hydroxide [NaOH] solution. The Na2SiO3 / NaOH ratio was 2.5 in the activator solution. The coarse aggregates were obtained from roller compacted concrete (RCC) wastes and an environmentally friendly material was produced without using any cement. As a roller compacted concrete is produced with a very dry consistency compared to conventional concrete, the amount of activator used is low, which provides environmental and economic benefits. The compressive strengths of the cube RCC specimens were determined at the ages of 7 and 28 days. Using the mix proportions designed in this study, it was found that the compressive strengths of alkali-activated RCCs were higher than roller compacted Portland cement concrete having high dosage of cement. Unit mass, total water absorption, ultrasonic pulse velocity [UPV], and modulus of elasticity of alkali-activated RCCs were also determined.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"28 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80744944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Multi-recycled aggregate concrete towards a sustainable solution – a review 多再生骨料混凝土走向可持续解决方案-综述

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.1.4

Madhavi Latha Kasulanati, Rathish Kumar Pancharathi

{"title":"Multi-recycled aggregate concrete towards a sustainable solution – a review","authors":"Madhavi Latha Kasulanati, Rathish Kumar Pancharathi","doi":"10.32047/cwb.2021.26.1.4","DOIUrl":"https://doi.org/10.32047/cwb.2021.26.1.4","url":null,"abstract":"Reduce, reuse and recycle are the important facets of susta-inable construction and environmental recovery. Increase in the construction activity generates huge amount of construction and demolition waste worldwide, and has a potential to be used as concrete coarse aggregate. In the future, where, most of the cities are likely to become concrete jungles, recycling and multi-recycling of concrete becomes all the more important. Also, the precast industry generates large amount of wastes due to discrepancies in quality of materials. Instead of depositing them as landfi lls or rejecting recycled materials, the possibility of reusing them is investigated and the fi nite number of times the recycling can be done, is examined. The present paper ponders on literature works, done by various researchers to check the variation in properties of recycled concrete aggregate, after fi nite number of generations of recycling. The studies on fresh and hardened state properties of recycled aggregate concrete showed a decrease in quality, with respect to mechanical performance of newly made concrete. The recycled concrete aggregate from precast rejects performed equal to natural concrete and even showed slightly higher compressive strength than natural aggregate concrete and can be replaced up to 20% of natural aggregate, to produce the concrete of accepted quality. The third generation recycled concrete aggregate showed almost twice the amount of mortar as that of fi rst generation re-cycled concrete aggregate. It can be seen that the concrete can be recycled only a fi nite number of times. A relationship between strength and durability properties of recycled aggregate concrete of different generations was derived based on multi-linear regres-sion analysis.","PeriodicalId":55632,"journal":{"name":"Cement Wapno Beton","volume":"4 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72579830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Addition of graphene oxide to increase the performance of concrete 添加氧化石墨烯，提高混凝土性能

IF 0.7 4区工程技术

Cement Wapno Beton Pub Date : 2021-01-01 DOI: 10.32047/cwb.2021.26.4.3

Małgorzata Wydra, Hubert Szulc

引用次数: 0