Effect of Early Curing Temperatures on Compressive Strength Development of Bottom Ash Aggregate Concrete

2021 ◽  
Vol 33 (6) ◽  
pp. 561-567
Author(s):  
Hye-Jin Lee ◽  
Hak-Young Kim ◽  
Keun-Hyeok Yang ◽  
Yong-Soo Jeon
Keyword(s):  
Compressive Strength ◽  
Bottom Ash ◽  
Strength Development ◽  
Aggregate Concrete ◽  
Compressive Strength Development

Composite Model for Time-Relative Compressive Strength of Recycled Coarse Aggregate Concrete

2013 ◽  
Vol 307 ◽  
pp. 395-398
Author(s):  
Bai Liang Yang ◽  
Wei Wang ◽  
Xu Chao Chi ◽  
Wen Hui Bai
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Hyperbolic Model ◽  
Strength Development ◽  
Engineering Structures ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Important Research Topic ◽  
Compressive Strength Development ◽  
Special Case

The compressive strength development process of recycled coarse aggregate concrete (RCAC) directly affects the safety of the engineering structures, which is an important research topic in the concrete mechanics. According to the statistics of the experimental results, the development mechanism principle of the compressive strength of RCAC gradually increasing with curing time was analyzed. The mathematical property was introduced to reveal the defects of the traditional hyperbolic model of the time-relative compressive strength (TRCS), and to point out that the mathematical nature of the ideal TRCS model should have. A new CES model was presented for TRCS. The mathematical analysis shows that the hyperbolic model is a special case of the CES model, and in another hand the CES model overcomes the defects of the hyperbolic model.

scholarly journals Evaluation of Workability and Mechanical Properties of Bottom Ash Aggregate Concrete

2020 ◽  
Vol 10 (22) ◽  
pp. 8016
Author(s):  
Yong-Hyok Kim ◽  
Hak-Young Kim ◽  
Keun-Hyeok Yang ◽  
Jung-Soo Ha
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Bottom Ash ◽  
Target Strength ◽  
Strength Development ◽  
Coarse Aggregates ◽  
Proposed Model ◽  
Reliable Model ◽  
Compressive Strength Development ◽  
Experimental Values

The purpose of this study is to evaluate the workability and mechanical properties of concrete containing bottom ash, which is an industrial byproduct, as an aggregate. Twelve concrete mixtures, including concrete containing bottom ash aggregate (CCBA), are classified into three groups of W/C 0.45, 0.375, and 0.3 according to the target strength. Each group includes four mixtures in which natural aggregate and bottom ash are applied as fine and coarse aggregates according to particular ratios. On the basis of the test results, a reliable model to predict the 28-day compressive strength of CCBA is proposed by applying regression analysis. The proposed model points out that when applying bottom ash as aggregate, the concrete density is lowered, and W/C should be reduced to offset the lowered compressive strength. As a result of comparing experimental values with the existing design code models, it is found that while the fib model accurately predicts compressive strength development and tensile resistance capacity in general, the ACI 318 code overestimates the elastic modulus at the oven-dried density (ρc) range of 1840 kg/m3 and above. Accurate prediction of the mechanical properties of CCBA requires the measurement of additional experimental data that consider W/C and ρc as important parameters.

scholarly journals The potential use of pumice in mine backfill

2020 ◽  
Vol 1 ◽  
Author(s):  
Mohammed A. Hefni
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Mining Industry ◽  
Strength Development ◽  
Natural Pozzolan ◽  
Mine Backfill ◽  
Natural Pozzolans ◽  
Cemented Backfill ◽  
Compressive Strength Development ◽  
Potential Use

Abstract The use of natural pozzolans in concrete applications is gaining more attention because of the associated environmental, economic, and technical benefits. In this study, reference cemented mine backfill samples were prepared using Portland cement, and experimental samples were prepared by partially replacing Portland cement with 10 or 20 wt.% fly ash as a byproduct (artificial) pozzolan or pumice as a natural pozzolan. Samples were cured for 7, 14, and 28 days to investigate uniaxial compressive strength development. Backfill samples containing 10 wt.% pumice had almost a similar compressive strength as reference samples. There is strong potential for pumice to be used in cemented backfill to minimize costs, improve backfill properties, and promote the sustainability of the mining industry.

Compressive strength development and durability properties of high-calcium fly ash incorporated concrete in extremely cold weather

2022 ◽  
Vol 316 ◽  
pp. 125801
Author(s):  
Dinil Pushpalal ◽  
Sunjidmaa Danzandorj ◽  
Narantogtokh Bayarjavkhlan ◽  
Tomoya Nishiwaki ◽  
Kazuya Yamamoto
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Cold Weather ◽  
Strength Development ◽  
Durability Properties ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Compressive Strength Development
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