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Low-CO[sub.2] Optimization Design of Quaternary Binder Containing Calcined Clay, Slag, and LimestoneLin, Run-Sheng; Liao, Yongpang; Han, Yi; Oh, Seokhoon; Park, Ki-Bong; Yang, Hyun-Min; Wang, Xiao-Yong; Yang, Bo; Meng, Li-Yi
Materials, 09/2023, Letnik: 16, Številka: 19Journal Article
Blended cement is commonly used for producing sustainable concretes. This paper presents an experimental study and an optimization design of a low-COsub.2 quaternary binder containing calcined clay, slag, and limestone using the response surface method. First, a Box–Behnken design with three influencing factors and three levels was used for the combination design of the quaternary composite cement. The lower limit of the mineral admixtures was 0%. The upper limits of slag, calcined clay, and limestone powder were 30%, 20%, and 10%, respectively. The water-to-binder ratio (water/binder) was 0.5. Experimental works to examine workability and strength (at 3 and 28 days) were performed for the composite cement. The COsub.2 emissions were calculated considering binder compositions. A second-order polynomial regression was used to evaluate the experimental results. In addition, a low-COsub.2 optimization design was conducted for the composite cement using a composite desirability function. The objectives of the optimization design were the target 28-day strength (30, 35, 40, and 45 MPa), target workability (160 mm flow), and low COsub.2 emissions. The trends of the properties of optimal combinations were consistent with those in the test results. In summary, the proposed optimization design can be used for designing composite cement considering strength, workability, and ecological aspects.
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