Journal of Cement Based Composites最新文献_第2页

Effect of Binary and Ternary Binders on Flow and Strength of Cement Mortar 二元和三元粘结剂对水泥砂浆流动和强度的影响

Journal of Cement Based Composites Pub Date : 2022-05-22 DOI: 10.36937/cebacom.2022.5626

Saeid Moghimi

{"title":"Effect of Binary and Ternary Binders on Flow and Strength of Cement Mortar","authors":"Saeid Moghimi","doi":"10.36937/cebacom.2022.5626","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5626","url":null,"abstract":"This paper reports the results of laboratory work on the flow and strength of cement mortars containing binary and ternary blends of portland cement, silica fume (SF), Class C fly ash (CFA) and Class F fly ash (FFA). The cement was partially replaced with 20 and 40 wt.% of fly ash (FA) and 5 wt.% of SF as binary mixtures. Besides, the ternary mixtures contained 15%FA+5%SF and 35%FA+5%SF in place of 20% and 40% cement respectively. Both fly ashes were used in the ternary mixtures, thus, 4 mixtures containing ternary binders were prepared. Two sets of mortar mixtures having either same flow or same water/binder (W/B) ratio as those of the control mixture (containing no mineral admixture) were investigated. In total, 15 mortar mixtures were taken into constitution in the present study. The flow of mixtures was measured immediately after casting. In addition, the 7-and 28-day flexural and compressive strength of the mortar mixtures were determined. The use of SF in binary mixtures with constant W/B ratio provided the highest compressive strength (68 MPa). In ternary mixtures the use of 20%FA+5%SF mixture with constant W/B ratio showed the highest 28-day compressive strength (65 MPa). Among the mixtures with constant W/B ratio, ternary mixtures showed the lowest flow values. Besides, in the mixtures with constant flow, once again, the ternary mixtures had the highest W/B ratio. Both in binary and ternary specimens, the mixtures prepared with FFA had a higher flow than that of the CFA mixtures.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114363306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cement-Biofouling and Sulfate Resistivity of Hardened Blended Cement Pastes in Marin Environment: A Case Study 海洋环境中水泥-生物结垢及硬化水泥浆的硫酸盐电阻率研究

Journal of Cement Based Composites Pub Date : 2022-05-21 DOI: 10.36937/cebacom.2022.5625

F. Hashem

{"title":"Cement-Biofouling and Sulfate Resistivity of Hardened Blended Cement Pastes in Marin Environment: A Case Study","authors":"F. Hashem","doi":"10.36937/cebacom.2022.5625","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5625","url":null,"abstract":"In the present study, field examinations are explored on diversed blended cement mixes. The hardened blended pastes are prepared using ordinary Portland cement (OPC), fine metakaolin (MK) and brine chlorine sludge(CLS). Cement fouling features and the attack by SO4-2 ions are studied on the blended samples that are immersed in the sea water for 9 months. The performance of the cured specimens was explored via studying the compressive strength, the percent of mass change and the volume expansion at various curing durations. Besides, the total chlorophyll colonized on the surface of the cured specimens was determined by using spectrophotometeric technique. XRD and SEM techniques are specifed for studying the phase compositions and the morphology of the formed cement hydrates. The results illustrate that the blended mixes show an antifouling behavior higher than the neat OPC. This is related to acquiring a more compact structure of reduced porosities upon OPC blending. Additionally, OPC-MK specimens showed higher SO-42 ions resistance than OPC-CLS or OPC pastes. This is related to the high pozzolanic properties of MK in contrary to brine sludge.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130680713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Experimental Investigation of the Effects of Fly Ash and Nano Titanium Dioxide (n-TiO2) Usage as Viscosity Modifying Agents(VMAs) in Cement-Based Grouts on Rheological Parameters. 粉煤灰和纳米二氧化钛(n-TiO2)作为黏度改性剂对水泥基灌浆流变参数影响的实验研究。

Journal of Cement Based Composites Pub Date : 2022-05-10 DOI: 10.36937/cebacom.2022.5624

F. Celik

{"title":"An Experimental Investigation of the Effects of Fly Ash and Nano Titanium Dioxide (n-TiO2) Usage as Viscosity Modifying Agents(VMAs) in Cement-Based Grouts on Rheological Parameters.","authors":"F. Celik","doi":"10.36937/cebacom.2022.5624","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5624","url":null,"abstract":"The effects of n-TiO2 additions at different amounts by mass (0.0%, 0.3%, 0.6%, 0.9%, 1.2% and 1.5%) on rheological properties (plastic viscosity and yield stress) of cement-based grouts incorporated with fly ash as mineral additive at different constitutes (0%-for control purpose, 5%, 10%, 15%, 20%, 25% and 30%) were investigated by analysis of experiments in this study. To prepare all samples, w/b ratio was defined as 1.0. To prevent sedimentation of TiO2 nanoparticles in free water and to supply uniform distribution of TiO2 nanoparticles in water with help of removing of these nanoparticles from each other, Ultrasonication method was applied by using a Horn type Ultrasonic Homogenizer in this experimental study. All experimental viscosity values of the cement-based grout samples were also obtained by using Coaxial Rotating Cylinder Rheometer test machine. Modified Bingham analytical model was used to investigate on this study for reference grout samples because of it shows dilatant (shear-thickening) flow behavior. Test results show that plastic viscosity values of the grout samples obtained by addition of FA remarkably decrease with rising amount of n-TiO2. Yield stress of fresh grout mixtures increases with respect to increase amount of FA content in all grout mixtures with different proportions of n-TiO2. the usage of FA as a mineral additive in cement-based grouts has improved the yield stress value of the samples. Since n-TiO2 has such a low specific surface area, the water requirement of the grout matrix tends to increase. Therefore, this situation causes increasing of cohesion. The developed ANNs model has been able to predict the plastic viscosity and yield stress of cement-based grouts containing TiO2 nanoparticle doped fly ash with very low error rates and high accuracy","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131223466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Improving Kiln Feed Chemistry and Overburden Wasting through Controlled Consistent Quarry Material Mix: A Case Study at Union Bridge Cement Plant 通过控制矿料配比改善窑料化学性质和覆盖层浪费——以联合桥水泥厂为例

Journal of Cement Based Composites Pub Date : 2021-10-10 DOI: 10.36937/cebacom.2022.5565

K. Boakye

{"title":"Improving Kiln Feed Chemistry and Overburden Wasting through Controlled Consistent Quarry Material Mix: A Case Study at Union Bridge Cement Plant","authors":"K. Boakye","doi":"10.36937/cebacom.2022.5565","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5565","url":null,"abstract":"Cement is made by milling clinker with a mix of grinded gypsum. The clinker is produced using a rotary kiln which burns a mixture of limestone, clay, magnesium, silica, and iron with desired atomic percentages. The quarry is the primary source of raw material for the rotary kiln in cement production. The consistency of material feed chemistry, in which the quarry plays a key role, is crucial for optimizing the performance of a rotary kiln. The quarry implemented a six-step methodology that comprised a modified 3D mining software modeling tool, a database computer loop prediction tools, and other tools to improve mining sequencing, optimize raw material usage, and provide consistent chemistry mix material for the kiln. By using overburden as a raw material in the mix, the quarry nearly universally reduces the environmental impact of squandering unwanted material in the quarry. This has a significant environmental impact since it requires less space to manage the overburden waste generated during mining. In addition, raw material usage was optimized for clinker production causing a reduction of 4% in sand usage as raw material, reduction in raw material purchase cost, reducing the variability of kiln feed chemistry, and producing high-quality clinker. The standard deviation of kiln feed LSF was improved by 45 percent, and the variability in kiln feed was reduced by 65 percent.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130223263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study of the Influence of the Aggressive Environment on the Behavior of Reactive Powder Concrete 侵蚀环境对活性粉末混凝土性能影响的研究

Journal of Cement Based Composites Pub Date : 2021-08-24 DOI: 10.36937/cebacom.2021.001.002

M. Chadli

{"title":"Study of the Influence of the Aggressive Environment on the Behavior of Reactive Powder Concrete","authors":"M. Chadli","doi":"10.36937/cebacom.2021.001.002","DOIUrl":"https://doi.org/10.36937/cebacom.2021.001.002","url":null,"abstract":"Reactive Powder Concrete (RPC) currently represents the family of cementitious matrix materials with properties the most exceptional mechanics and durability. This study aims to investigate the physico-mechanical properties, and the durability in a sulphated environment of a reactive powder concrete using materials available in our region, we have integrated materials rich in silica (slag, silica fume and crushed quartz) in Portland cement with 15, 23 and 25%, respectively. After The remove of the specimens from the mold and place the RPC in the curing box under steam curing conditions of 90 ° C for 72h, let them cool naturally for 24 h, the test pieces are immersed in water at 20 ° C, the specimens are broken in flexion and compression. From this study we can make the following conclusions: The incorporation of additions increases the compressive and flexural tensile strengths, which gives an improvement in the compactness of the mixtures by the pozzolanic effect of these last, by removing the particle size phase in the RPC and the affluence of dune sand (southern Algeria) and slag (industrial waste from the iron ore blast furnace), because Na2SO4 has a major effect on the compressive strength notably for non-fibrous formulations. NaOH improve the compressive strength for all formulation.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115772890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Change in Ambient Temperature on Creep of Concrete 环境温度变化对混凝土徐变的影响

Journal of Cement Based Composites Pub Date : 2021-08-24 DOI: 10.36937/cebacom.2021.001.004

Z. Kammouna

引用次数: 0

Short-Term Study on Mechanical and Fresh properties of Micro-silica based Self Consolidating Concrete in Nigeria 尼日利亚微硅基自固结混凝土力学性能与新鲜性能的短期研究

Journal of Cement Based Composites Pub Date : 2021-08-24 DOI: 10.36937/cebacom.2021.001.003

T. A. Buari

{"title":"Short-Term Study on Mechanical and Fresh properties of Micro-silica based Self Consolidating Concrete in Nigeria","authors":"T. A. Buari","doi":"10.36937/cebacom.2021.001.003","DOIUrl":"https://doi.org/10.36937/cebacom.2021.001.003","url":null,"abstract":"The ever increasing environmental challenge arising from improper waste management has been a great concern to researchers and the society. One of such industrial waste is micro silica; a bye-product of the Carbothermic reduction of high purity quartz at temperature of about 2000oC in the presence of coke. The finess of this material and its pozollanic nature makes it suitable for use in the production of self-compacting concrete. In this research micro silica was introduced in percentages of, 5, 10 and 15% as partial replacement of cement in the production of self-compacting concrete. The fresh properties were examined using slump flow, T50cm, slump flow, V-funnel and blockage ratio using L-Box. As the Micro silica were introduced, T50cm time increased, Slump flow reduced, V-funnel flow time increased and L-Box value reduced, due to increase in viscosity. Comparing the experimental results with European Federation of National Associations of Representing for Concrete EFNARC 2002, blockage ratio for 15% was below 0.8. The compressive stresses at 28days were higher than the control at 28days compressive stress with 8.6%, 19.04% and 11.9% for 5%, 10% and 15% respectively. Thus, cement can be partially substituted with micro silica up to 15% with improvement in compressive strength in self-compacting concrete.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115957514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of Additives on Flexural Strength of Roller Compacted Concrete 添加剂对碾压混凝土抗弯强度的影响

Journal of Cement Based Composites Pub Date : 2021-08-21 DOI: 10.36937/cebacom.2021.001.001

S. Sarsam

{"title":"Influence of Additives on Flexural Strength of Roller Compacted Concrete","authors":"S. Sarsam","doi":"10.36937/cebacom.2021.001.001","DOIUrl":"https://doi.org/10.36937/cebacom.2021.001.001","url":null,"abstract":"Roller compacted concrete is considered as a sustainable solution. In the present investigation, three types of additives namely (fly ash, fumed silica, and hydrated lime) are implemented as partial replacement of Portland cement for preparation of roller compacted concrete slab samples using dense and gap aggregate gradation. The slab samples were prepared at optimum cement requirement of 12 % and at (2 and 4) % cement below and above the optimum. Beam specimens of (38 x 10 x 8) Cm were extracted from the slab samples using diamond saw. The specimens were subjected to flexural strength determination using two testing modes, the three and the four points loading. It was noticed that the flexural strength under four-points loading mode is lower by a range of (0.787 to 0.732) folds than that under three-points loading mode for dense and gap graded mixtures respectively. It was concluded that the flexural strength increases by (96.2, 84, and 17.2) % and (109, 86, and 9.3) % after replacement of (10, 12, and 15) % of cement by hydrated lime while it declines by (50, 64.6, and 77) % and (0.1, 30.8, and 63.5) % after replacement of (5, 7, and 10) % of cement by fumed silica for dense and gap graded aggregates respectively. The flexural strength of dense graded mixtures increases by 63 % at 20 % replacement by fly ash, however, it increases by (99.7, 53.8, and 1.0) % after replacement of (10, 12, and 15) % of cement by fly ash for gap graded aggregates respectively.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116014260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent developments in Polyvinyl-chloride tube filled with concrete 聚氯乙烯管填充混凝土的最新进展

Journal of Cement Based Composites Pub Date : 2021-06-15 DOI: 10.36937/cebacom.2022.5555

Nwzad Abduljabar Abdulla

{"title":"Recent developments in Polyvinyl-chloride tube filled with concrete","authors":"Nwzad Abduljabar Abdulla","doi":"10.36937/cebacom.2022.5555","DOIUrl":"https://doi.org/10.36937/cebacom.2022.5555","url":null,"abstract":"This study highlights the recent developments in the use of Polyvinyl-chloride (PVC) in the construction technology. The PVC is a very versatile plastic, resistant to fire (prevents the spread of fire) wear and rupture, with excellent anti-chemicals and anti-corrosion characteristics. The material could be produced with plasticizers (PVC, more flexible) or without (uPVC, more rigid). The thermoplastic polymer is the most widely used polymer for structural concrete applications; either as a simple tube for pour-in concrete or the more complicated Stay-in-place formwork (SIPF) systems. In this study, the structural performance of uPVC-encased concrete (uPEC) used as a compression member is reviewed, for the period start-end of 2020, with emphases on the resistance of these members to the applied axial load. The study is extended to cover the seismic behavior of these confining devices when used in combination with the brittle concrete. Several strength models have been proposed for evaluating the bearing capacity of uPEC columns under monotonic axial compression load. Most of these models are based on limited number of test results and might yield unsatisfactory predictions. On the other hand, the number of models for predicting the strain at peak stress are limited. The main features of these models were reviewed and recommendations presented for future research.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131249995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Metakaolin Addition on The Mechanical Performance and Durability of Granulated Blast Furnace Slag Based Geopolymer Mortar with Micro-Encapsulated Phase Change Materials 掺加偏高岭土对微囊化相变材料颗粒状高炉渣基地聚合物砂浆力学性能和耐久性的影响

Journal of Cement Based Composites Pub Date : 2021-01-05 DOI: 10.36937/cebacom.2021.001.005

Bouha El Moustapha

{"title":"Effect of Metakaolin Addition on The Mechanical Performance and Durability of Granulated Blast Furnace Slag Based Geopolymer Mortar with Micro-Encapsulated Phase Change Materials","authors":"Bouha El Moustapha","doi":"10.36937/cebacom.2021.001.005","DOIUrl":"https://doi.org/10.36937/cebacom.2021.001.005","url":null,"abstract":"Incorporating microcapsule phase change materials (MPCM) into geopolymer is one of the most successful solutions for enhancing building thermal comfort and replacing Portland cement-based materials. Although MPCM improves the thermal capacity of the cementitious matrix, whether it's made of cement or geopolymer, it presents a number of disadvantages in terms of mechanical and physical performance. Several researchers have pointed out that this scientific subject remains unresolved. The purpose of this study is to investigate the influence of 10% and 20% metakaolin (MK) inclusions on the mechanical properties and durability of geopolymer-MPCM mortars based on granulated blast furnace slag (GBFS) and to compare them with Portland cement-MPCM based mortars. The results show that the addition of two proportions of metakaolin is able to compensate well for the loss of mechanical strength associated with the addition of MPCM. Thus, up to 20% MPCM, the addition of metakaolin increases compressive strength by approximately 10 MPA. Compared to Portland-MPCM cement mortars, all geopolymer-MPCM mortars show higher compressive strength, better workability and lower porosity. Finally, in terms of durability evaluation, the resistivity measurements reveal that the risk of corrosion of the cement-based mortar on the steel bars is negligible, while the risk of corrosion of the geopolymer-based mortar on the steel bars is low.","PeriodicalId":343973,"journal":{"name":"Journal of Cement Based Composites","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123131960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2