@Article{jrm.2023.025129,
AUTHOR = {Yafei Hu, Keqing Li, Lujing Zheng, Bin Han},
TITLE = {Fly Ash and Slag as Partial Replacement of Cement for the Synthesis of Low Carbon Cementitious Materials},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {11},
YEAR = {2023},
NUMBER = {5},
PAGES = {2491--2511},
URL = {http://www.techscience.com/jrm/v11n5/51694},
ISSN = {2164-6341},
ABSTRACT = {Tailings known as solid waste are generated by the mining industry. The development of tailings as wet shotcrete
aggregates has significant economic and environmental benefits. The fine particle size of the tailings results in a
large consumption of traditional cement as a cementitious material and insignificant improvement in strength.
Therefore, a composite cementitious system of cement and solid waste resources (fly ash and slag powder) is
explored for this study. In this paper, the response surface methodology (RSM) is used to optimize the experimental design and a multivariate nonlinear response model with cement, fly ash and slag powder contents as variables
are constructed, which can investigate the effect of the composite cementitious system on the strength of tailing
wet shotcrete (TWSC). In addition, the information entropy (IE) is introduced and combined with the RSM to
evaluate the composite cementitious system. Finally, the desirability function (DF) combined with RSM is used to
optimize the composite cementitious system. The results show that the response model constructed in this paper
has R<sup>2</sup> = 0.96 and <i>P</i>-value < 0.01 (the test result of the model is <i>P</i>-value < 0.01), which indicates that the model has
high reliability. The higher the content of slag powder and cement in the composite cementitious system, the
higher the strength and comprehensive score of the TWSC. There is a critical value of fly ash content, which
makes the maximum cementation of the composite cementing system. The optimal mix proportion of the composite cementitious system is obtained based on RSM-DF, which leads to the strength of TWSC at different curing
time to achieve the expected index.},
DOI = {10.32604/jrm.2023.025129}
}