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This paper series includes two parts: (1) theoretical considerations and (2) experimental evaluations. In Part 1, the chloride ion diffusion and migration processes in concentrated solutions are theoretically analyzed. The quantitative relationship between diffusion coefficient and migration...
This paper presents the results of an experimental investigation on the effect of initial curing on chloride diffusion in three generic repair materials and a concrete mix of similar grade. Two field conditions of initial curing were simulated as follows: (1) exposure to a chloride environment...
A two-step analytical procedure is proposed to evaluate the quantitative influence of the maximum aggregate size and aggregate gradation on the effective Young's modulus of concrete. In the first step, the effective Young's modulus of a specified “basic element,” which is composed of an...
Detailed research on the weathering and degradation of solidified and stabilized wastes once treated materials have been buried is lacking, and published data to verify the long-term performance and durability of landfilled treated wastes over time are still only limited. Optical and electron...
The influence of mixing shear rate on the rheological properties of cement paste was investigated. Cement pastes were mixed, sheared at a constant rate in a rheometer, and then subjected to increasing and decreasing shear rates, producing a hysteresis loop when plotted against shear stress. The...
To investigate how an oscillating reaction rate might influence the hydration of cementitious solids, a simple iterative mathematical model that includes recurrent passivation of the surface has been constructed. The algorithm generates a wide variety of hydration curves with a limited number of...
The slags from blast furnace (iron making ) and converter (steel making) after magnetic separation are mixed with limestone of six different compositions. The ground materials are fired in a pilot plant scale rotary kiln to 1350 °C for 1 h. The clinker is cooled, crushed, mixed with 3% gypsum,...
The particle shape characteristics of the coarse aggregate used can significantly affect the workability, strength, and durability of the concrete produced. However, traditionally, particle shape measurements have to be done in a manual way that is both cumbersome and time-consuming. Herein,...
The physical properties of freshly mixed high performance concrete were investigated. Physical state and quality of fresh concrete were monitored batch by batch. The properties of fresh high performance concrete were determined in respect of slump, slump flow, V-funnel flow, air content,...
Sulfate in soil and groundwater may cause damage to the concrete in underground structures. In this paper, laboratory tests were performed to assess the damage of chemical attack by magnesium sulfate and sodium sulfate on normal and high strength concretes. The selected solutions were pure water...
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