Advances in Civil Engineering Materials最新文献_第8页

Evaluation of Current ASTM Standards for ASR Prevention When Fine Lightweight Aggregates Are Used 评估使用轻质细骨料时防止ASR的现行ASTM标准

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-10-05 DOI: 10.1520/acem20200076

Chang Li, J. Ideker, M. Thomas

{"title":"Evaluation of Current ASTM Standards for ASR Prevention When Fine Lightweight Aggregates Are Used","authors":"Chang Li, J. Ideker, M. Thomas","doi":"10.1520/acem20200076","DOIUrl":"https://doi.org/10.1520/acem20200076","url":null,"abstract":"Previous research has shown that using fine lightweight aggregate (FLWA) can be a promising strategy to mitigate alkali-silica reaction (ASR) in mortar and concrete. However, limited studies focused on assessing current ASTM standards for their applicability in evaluating the efficacy of ASR mitigation using FLWAs. In this study, three commercially used FLWAs (expanded shale, clay, and slate) were investigated in mortar and concrete mixtures with reactive aggregates of different levels of reactivity. ASTM test methods, including ASTM C289-07, Standard Test Method for Potential Alkali-Silica Reactivity of Aggregates (Chemical Method) (Withdrawn 2016); ASTM C1260-14, Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method) (Superseded); and ASTM C1293-18, Standard Test Method for Determination of Length Change of Concrete due to Alkali-Silica Reaction (Superseded), were completed. Fine normal-weight aggregates were replaced by the FLWA at 25 % and 50 % by volume in the concrete mixtures, and 25 %, 50 %, and 100 % in mortar mixtures. Results showed that ASTM C1260-14 and ASTM C1293-18 can be used to evaluate the mitigation efficacy when pre-wetted FLWAs were used. The ASTM C289-07 test is not a reliable test method to study the reactivity of the FLWAs, but the results can be used to indicate the alkali-consuming ability of the FLWAs. All three FLWAs were effective in reducing ASR-induced expansion in both ASTM C1260-14 and ASTM C1293-18. The investigated FLWAs were especially effective in the concrete when moderately reactive aggregates, as classified by ASTM C1778-14, Standard Guide for Reducing the Risk of Deleterious Alkali-Aggregate Reaction in Concrete (Superseded), were used. For concrete with a highly reactive aggregate or very highly reactive aggregate, other mitigation strategies may need to be combined with FLWAs to effectively mitigate ASR.","PeriodicalId":51766,"journal":{"name":"Advances in Civil Engineering Materials","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77466855","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 Silica Fume on Mechanical Properties and Microhardness of Interfacial Transition Zone of Different Recycled Aggregate Concretes 硅粉对不同再生骨料混凝土界面过渡区的力学性能和显微硬度的影响

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-10-05 DOI: 10.1520/acem20210011

S. V. Patil, K. B. Rao, G. Nayak

{"title":"Influence of Silica Fume on Mechanical Properties and Microhardness of Interfacial Transition Zone of Different Recycled Aggregate Concretes","authors":"S. V. Patil, K. B. Rao, G. Nayak","doi":"10.1520/acem20210011","DOIUrl":"https://doi.org/10.1520/acem20210011","url":null,"abstract":"Several countries have started using recycled aggregate as a partial replacement to natural aggregate in concrete. Recycled aggregate contains adhered mortar, which distinguishes it from the natural aggregate. In the present study, natural coarse aggregates were entirely replaced by two kinds of recycled coarse aggregates. The recycled aggregates obtained from the jaw crushing method were named recycled coarse aggregate-1 and the aggregates that were further processed by the ball milling method were named recycled coarse aggregate-2. The performance of control concrete and two kinds of recycled coarse aggregate concretes were studied experimentally with respect to mechanical properties. Results indicate that the processing method to obtain recycled coarse aggregates plays an important role in developing the required mechanical properties. The ball mill processed aggregates performed better than the jaw crushed aggregates in concrete. The performance was also assessed with respect to the microhardness of the interfacial transition zone around the surface of the aggregates. The presence of adhered mortar in recycled aggregate weakens it because of the presence of an old interfacial transition zone that affects the strength of concrete. The interfacial transition zone hardness at the aggregate-mortar interface is 53.94, 34.21, and 44.08 % of bulk concrete for control concrete, recycled coarse aggregate-1 concrete, and recycled coarse aggregate-2 concrete, respectively. The addition of silica fume improved the average microhardness, and the same was reflected in the mechanical properties of both the recycled coarse aggregate concretes. It is recommended to use ball mill processed recycled coarse aggregates as a complete replacement to natural coarse aggregates along with a 5 % addition of silica fume for better performance.","PeriodicalId":51766,"journal":{"name":"Advances in Civil Engineering Materials","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86260027","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

Evaluation of Strength and Water Susceptibility Performance of Polypropylene Fiber–Reinforced and Silica Fume–Modified Hot Mix Asphalt 聚丙烯纤维增强和硅灰改性热混合沥青强度及水敏感性评价

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-09-22 DOI: 10.1520/acem20210029

Nitin Tiwari, N. Satyam

引用次数: 3

Performance of Cellular Concrete under Low-Velocity Impact and Penetration 泡沫混凝土在低速冲击和侵彻作用下的性能

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-09-21 DOI: 10.1520/acem20210063

F. Mendonça, Jiong Hu

{"title":"Performance of Cellular Concrete under Low-Velocity Impact and Penetration","authors":"F. Mendonça, Jiong Hu","doi":"10.1520/acem20210063","DOIUrl":"https://doi.org/10.1520/acem20210063","url":null,"abstract":"Cellular concrete, also known as foamed concrete, has been widely used in different geotechnical and nonstructural applications owing to a unique geometric nature that results in low density and high flowability and its low construction cost. The behavior of cellular concrete under impact or penetration has also drawn attention in applications such as engineered material arrestor systems, emergency escape ramps, and crash barriers. The high void content inside cellular concrete allows it to undertake large deformation, which could lead to high energy absorption. However, there is still a lack of fundamental understanding of the energy absorption of the material and response of the material under impact or penetration. This paper carries out an investigation of the response of cellular concrete subjected to low-velocity impact and penetration. Cellular concretes with different foaming agents and with fibers were prepared and evaluated. Experimental results demonstrated the superior ability of cellular concrete in absorbing and dissipating impact and penetration energies compared with conventional concrete. The paper shows that through steadily deforming the internal void structure, cellular concrete can diminish the reaction force caused by a collision and dissipate penetration energy. Results of the study can help to better understand the mechanism of energy absorption of cellular concrete so as to better tailor it for different applications.","PeriodicalId":51766,"journal":{"name":"Advances in Civil Engineering Materials","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81980120","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

Effectiveness of Microbially Induced Calcite Precipitation for Treating Expansive Soils 微生物诱导方解石降水处理膨胀土的效果

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-08-19 DOI: 10.1520/acem20200182

R. Wei, J. Z. Xiao, S. F. Wu, H. Cai, Z. W. Wang

引用次数: 1

X-ray Diffraction-Based Quantification of Amorphous Phase in Alkali-Activated Blast Furnace Slag 基于x射线衍射的碱活化高炉炉渣非晶相定量研究

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-07-07 DOI: 10.1520/ACEM20200167

K. C. Reddy, K. Subramaniam

引用次数: 1

Quantification of Calcium Oxychloride by Differential Scanning Calorimetry: Validation and Optimization of the Testing Procedure 差示扫描量热法定量氯化钙:测试程序的验证与优化

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-06-09 DOI: 10.1520/ACEM20200122

L. Montanari, Jussara Tanesi, Haejin Kim, A. Ardani

{"title":"Quantification of Calcium Oxychloride by Differential Scanning Calorimetry: Validation and Optimization of the Testing Procedure","authors":"L. Montanari, Jussara Tanesi, Haejin Kim, A. Ardani","doi":"10.1520/ACEM20200122","DOIUrl":"https://doi.org/10.1520/ACEM20200122","url":null,"abstract":"The American Association of State Highway and Transportation Officials (AASHTO) T 365 standard, Standard Method of Test for Quantifying Calcium Oxychloride Formation Potential of Cementitious Pastes Exposed to Deicing Salts, describes a test methodology that uses low-temperature differential scanning calorimetry (LTDSC) to quantify the formation of calcium oxychloride in cementitious systems exposed to concentrated calcium chloride solutions. AASHTO T 365 is included in AASHTO PP 84, Standard Practice for Developing Performance Engineered Concrete Pavement Mixtures, as a performance indicator for mixtures at risk of calcium oxychloride formation. During the test, the sample temperature is first dropped to −90°C, looped through a brief thermal cycle, then slowly increased to a maximum of 50°C, at a constant heating rate of 0.25°C/minute (min), for a total testing time of approximately 11 hours. The objective of this work is to modify the test to reduce its duration to facilitate wide adoption among practitioners. It is found that by increasing the minimum conditioning temperature from −90°C to −5°C, as well as by increasing the heating rate from 0.25°C/min up to 1°C/min, the test duration can be reduced from approximately 10.7 hours to approximately 1.6 hours without any statistically significant difference in the numerical test results, although an offset of the melting peak and a change in its shape were observed. This change can provide valuable savings in terms of time and energy/gas consumption and make AASHTO T 365 more competitive with other available tests for the estimation of calcium oxychloride formation, such as thermogravimetric analysis (TGA). TGA and LTDSC are compared to each other in terms of mixture classification for susceptibility to calcium oxychloride formation. It is shown that the two tests show good agreement, with 85 % of cases (out of 30 tested) receiving the same classification.","PeriodicalId":51766,"journal":{"name":"Advances in Civil Engineering Materials","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74339076","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

Creep and Shrinkage of Early-Age Concrete at Cold Temperature 低温下早期混凝土的徐变与收缩

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-06-02 DOI: 10.1520/ACEM20200101

I. Ahn

引用次数: 1

Crack Width Estimation Using Measurements of Central Deflection in ASTM C1609/C1609M ASTM C1609/C1609M中使用测量中心挠度来估计裂缝宽度

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-05-24 DOI: 10.1520/ACEM20200153

E. Bernard

引用次数: 0

Influence of Bio-oil Modification on Moisture-Induced Damage Potential of Asphalt Binder and Mix 生物油改性对沥青粘结剂和混合料湿损伤潜力的影响

IF 1.4

Advances in Civil Engineering Materials Pub Date : 2021-05-24 DOI: 10.1520/ACEM20200143

Shashibhushan Girimath, Dharamveer Singh, Burhan Showkat

引用次数: 2