Regenerated concrete and manufacturing method thereof
A technology for recycled cement and Portland cement, applied in the direction of cement production, etc., can solve the problems of lack of technical regulations and standards for recycled aggregate and recycled concrete, lack of systematic application basic research, etc., and achieves good workability and low cost. , the effect of protecting the environment
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Embodiment 1
[0027] The waste concrete, slag, steel slag, gypsum, and Portland cement clinker were ground separately to measure their specific surface area. It is known that the specific surface area of waste concrete powder A is 591.3m 2 / kg, the specific surface area of waste concrete powder B is 711.4m 2 / kg, the specific surface area of slag is 472.5m 2 / kg, the specific surface area of steel slag is 320.6m 2 / kg, the specific surface area of Portland cement clinker is 320.1m 2 / kg, the specific surface area of gypsum is 451.2m 2 / kg, then mixed evenly according to the proportions in Table 2 and Table 3, prepared into recycled cement, tested according to the national standard of GB / T3183-2003 masonry cement, and measured its carbonation 7d strength, it can be seen that all physical properties are in line with GB / T3183-2003 national standard for masonry cement. Among them, the carbonization 7d strength means that the recycled cement is molded according to GB17671-1999 "...
Embodiment 2
[0037] The waste concrete, slag, steel slag, gypsum, and Portland cement clinker were ground separately, and the specific surface area was measured. It is known that the specific surface area of waste concrete powder A is 591.3m 2 / kg, the specific surface area of waste concrete powder B is 711.4m 2 / kg, the specific surface area of slag is 472.5m 2 / kg, the specific surface area of steel slag is 320.6m 2 / kg, the specific surface area of Portland cement clinker is 320.1m 2 / kg, the specific surface area of gypsum is 451.2m 2 / kg, and then uniformly mixed according to the ratio in Table 4 to prepare regenerated cement. After adding the water reducing agent (it belongs to external addition and is not included in the percentage), the amount of water added is determined by controlling the fluidity of the mortar between 180mm and 190mm, and then According to GB 17671-1999 "Cement Mortar Strength Test Method", the strength of 3d, 7d, 28d, drying 2d, carbonization 7d...
Embodiment 3
[0045] Grind the waste concrete, gypsum and Portland cement clinker separately, measure their specific surface area, and know that the specific surface area of waste concrete powder A is 591.3m 2 / kg, the specific surface area of waste concrete powder B is 711.4m 2 / kg, the specific surface area of Portland cement clinker is 320.1m 2 / kg, the specific surface area of gypsum is 451.2m 2 / kg. The steel slag and slag are mixed and ground at a ratio of 4:1, and ground into three different specific surface areas: 320m 2 / kg, 458m 2 / kg, 522m 2 / kg. Then mix uniformly according to the proportions in Table 6 and Table 7 respectively, and prepare regenerated cement. Inspect according to the national standard of GB / T3183-2003 masonry cement, and measure its carbonation 7d strength. The results are shown in Table 6 and Table 7. All physical properties can meet the national standards of GB / T 3183-2003 masonry cement. standard. Among them, the carbonization 7d strength ref...
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