Abstract
Cracking of old brick-concrete structures is a serious problem in Shanghai. It is necessary to use quick, high-strength materials to repair load cracks. In this paper, a kind of magnesium phosphate cement (MPC) mortar was developed and selected as the bonding material for brick masonry-loaded cracks. Factors such as the water-binder ratio, sand-binder ratio and borax content that affect the properties of the MPC mortar were studied, and a suitable mixture proportion was chosen for repairing fractured bricks based on the results. Indoor experiments were conducted for assessing the mechanical properties and repair performance for repairing fractured bricks by two kinds of bonding methods. The results show that the MPC mortar has good performance in quick repair projects because of its short setting time and early strength. Using MPC mortar as a bonding material for brick masonry loaded cracks not only achieved the desired bonding effect, but also significantly improved the speed of the repair.
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