Abstract
The numerical simulations were employed to establish an edge-corner repair model with magnesium phosphate cement (MPC) concrete as the repair material and ordinary Portland cement concrete as the old pavement. After the simulation of repair construction by using MPC concrete with different coarse aggregates, the effect of sudden temperature drop during the stable stage of hydration reaction on the stress distribution at each bonding interface was analyzed. The numerical calculations indicate that the sudden temperature drop led to temperature-induced stress on the bonding interfaces. The stress distribution at each bonding interface was obtained and the maximum principal stress at each bonding interface was at the intersection angle of three bonding interfaces. The relationship between the temperature and stress at each bonding interface was found when different coarse aggregates were used to prepare the repairing material. Also, the effect of different coarse aggregates on the bonding interface of the repairing material was obtained when basalt was the coarse aggregate of old concrete. The stability of bonding surface from best to worst was as follows: basalt > limestone > granite > conglomerate > sandstone > quartzite.
Highlights
In recent years, owing to its high rigidity, good stability, and convenient construction, cement concrete has been extensively used in the runway projects of airports [1]
Different coarse aggregates were used to prepare the systems consisting of the old concrete pavement and repair concrete. e effect of temperature drop on the stress distribution of the repaired bonding interface was studied after the hydration heat release tended to stabilize
After the repair was completed and when the hydration reaction entered a stable stage, the effect of sudden temperature drop on the stress distribution of each bonding interface was investigated. e conclusions are as follows: (1) When the repair material was different from the coarse aggregates of old concrete, the sudden temperature drop causes a temperature stress on the repaired bonding interface. e magnitude of the temperature stress corresponds to the magnitude of temperature drop and the type of coarse aggregates
Summary
In recent years, owing to its high rigidity, good stability, and convenient construction, cement concrete has been extensively used in the runway projects of airports [1]. Magnesium phosphate cement (MPC) is a relatively novel type of rapid-repair material for the concrete pavement. It has several advantages such as short setting time, high strength, remarkable wear resistance, strong temperature adaptability, and excellent volume stability [4, 5]. When the repair construction is completed and most of the hydration heat has been released, the repair concrete slowly cools down until it reaches the ambient temperature At this time, the strength and bonding strength of the repair concrete continue to increase slowly. Erefore, in the rapid-repair project under extreme weather conditions, it is essential to study the effect of temperature load on the stress distribution of the repaired bonding interface. When the hydration becomes stable and the strength continues to increase, the stress distribution is adopted as the research object and the effect of environmental temperature change on the stress distribution of each bonding interface is investigated. e study provides a theoretical basis for the applications of magnesium phosphate cement concrete in the repairing engineering under extreme climate conditions
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