A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention discloses a modified cement mortar for concrete repair and a preparation method thereof. The preparation method comprises the following steps: a) weighing and mixing predetermined amounts of cement, aggregate and fly ash; b) adding predetermined amounts of a butylbenzene emulsion, an antifoaming agent and an early strength agent into tap water and mixing the obtained solution with the mixture prepared in the step a); and c) controlling the fluidity of mortar to be in a range of 140 +/- 5 mm, separately measuring flow-table fluidity and unit weight of the newly-mixed mortar and carrying out casting molding for repairing when the determined flow-table fluidity and unit weight of the newly-mixed mortar are substantially identical to to-be-repaired concrete. According to the modified cement mortar for concrete repair and the preparation method thereof, initial set of the cement mortar can be accelerated, the water-reducing rate of the mortar can be increased, the unit weight of the newly-mixed mortar can be decreased, the ratio of bending-compressive strength of the mortar can be obviously enhanced, and rapidly repaired concrete has better durability.
The invention discloses a modified cement mortar for concrete repair and a preparation method thereof. The preparation method comprises the following steps: a) weighing and mixing predetermined amounts of cement, aggregate and fly ash; b) adding predetermined amounts of a butylbenzene emulsion, an antifoaming agent and an early strength agent into tap water and mixing the obtained solution with the mixture prepared in the step a); and c) controlling the fluidity of mortar to be in a range of 140 +/- 5 mm, separately measuring flow-table fluidity and unit weight of the newly-mixed mortar and carrying out casting molding for repairing when the determined flow-table fluidity and unit weight of the newly-mixed mortar are substantially identical to to-be-repaired concrete. According to the modified cement mortar for concrete repair and the preparation method thereof, initial set of the cement mortar can be accelerated, the water-reducing rate of the mortar can be increased, the unit weight of the newly-mixed mortar can be decreased, the ratio of bending-compressive strength of the mortar can be obviously enhanced, and rapidly repaired concrete has better durability.
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