Effect of rapid set binder on early strength and permeability of HES latex modified road repair pre-packed concrete

4th Global Conference on Materials Science and Engineering

Han, J.W.^1 ; Lee, S.K.^1 ; Yu, C.^2 ; Park, C.G.^3

Department of Bio-Industry Mechanical Engineering, Kongju National University, Yesan, Korea, Republic of^1

Major of Agricultural Engineering (Inst. of Agri. and Life Sci.), Gyeongsang National University, Jinju

660-701, Korea, Republic of^2

Department of Rural Construction Engineering, Kongju National University, Yesan, Korea, Republic of^3

关键词: Binder material;    Design standard;    Emergency repair;    High early strength;    Repair concretes;    Repair materials;    Strength development;    Styrenebutadiene latices (latex);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/103/1/012007/pdf
DOI  :  10.1088/1757-899X/103/1/012007

来源: IOP

【 摘 要 】

The early strength development characteristics and permeability resistance of high early strength (HES) pre-packed road repair concrete incorporating a rapid-set binder material were evaluated for emergency repairs to road pavement. The rapid-set binder is a mixture of rapid-set cement and silica sands whose fluidity improves with the addition of styrene butadiene latex (latex). The resulting mixture has a compressive strength of 21 MPa or higher and a flexural strength of greater than 3.5 MPa after 4 hours, the maximum curing age allowed for emergency repair materials. This study examines the strength development properties and permeability resistance of HES latex-modified pre-packed road repair concrete using a rapid-set binder as a function of the latex-to-binder mixing ratio at values of 0.40, 0.33, 0.29 and 0.25. Both early strength development properties and permeability resistance increased as the ratio of latex to rapid-set binder decreased. The mixture showed a compressive strength of 21 MPa or higher after 4 hours, which is the design standard of emergency repair concrete, only when this ratio was 0.29 or lower. A flexural strength of 3.5 MPa or greater was observed after 4 hours only when this ratio was 0.33 or lower. The standard for permeability resistance, less than 2,000 C of chloride after 7 days of curing, was satisfied by all ratios. The ratio of latex to rapid-set binder satisfying all of the conditions for an emergency road repair material was 0.29 or less.