Carbonization maintenance aerated concrete
A technology of aerated concrete and carbonation curing, which is applied in the field of building material aerated concrete, which can solve the problems of low strength, long curing time, and low strength, and achieve the effects of low cost, shortened production cycle, and reduced emissions
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[0030] Example 1:
[0031] Choose a cement company in Jinan to produce Portland cement as the raw material, and its chemical composition is: CaO64.81%, SiO 2 21.58%, Fe 2 O 3 3.20%, Al 2 O 3 4.90%, MgO3.70%, SO 3 0.52%.
[0032] Mix the above raw materials with appropriate amount of water, and add appropriate amount of gas generating agent and other additives. After mixing, stirring, pouring and foaming, and the embryo body is stopped, cut into 76×38×12mm 3 The bricks are cured with industrial waste gas containing 25% carbon dioxide wt. The curing gas pressure is 1.5 bar and the carbonization curing temperature is 50-100°C. After 5 hours of curing, finished bricks are made.
[0033] After carbonization curing, the weight increase of Portland cement aerated concrete bricks absorbs about 14% of carbon dioxide; its compressive strength is 6.8MPa.
[0034] The SEM-EDS analysis diagram of the Portland cement of the present invention is shown in FIG. 2, and it can be seen from the diagr...
Example Embodiment
[0035] Example 2:
[0036] The steel slag discharged by Jinan Iron and Steel Group is selected as the raw material, and its chemical composition is: CaO38.91%, SiO 2 13.32%, Fe 2 O 3 23.11%, FeO 21.62%, Al 2 O 3 1.57%, MgO7.61%, P 2 O 5 1.47%, MnO 2 2.29%.
[0037] Add the above raw materials, add appropriate amount of water, mix well, and add appropriate amount of gas generating agent and other additives. After mixing, stirring, pouring and foaming, and the embryo body is stopped, cut into 76×38×12mm 3 The bricks are cured with industrial waste gas containing more than 25% carbon dioxide wt. The curing gas pressure is 2bar and the carbonization curing temperature is 50-150°C. After 10 hours of curing, finished bricks are made.
[0038] After carbonization and curing, the weight of steel slag increases by about 13% of carbon dioxide absorption, and its compressive strength is 7.2MPa.
[0039] The XRD analysis chart of the carbonized material before and after carbonization is shown...
Example Embodiment
[0041] Example 3:
[0042] Select waste cement as the carbonized material, its chemical composition and its weight percentage are:
[0043] CaO
[0044] Mix the above-mentioned raw materials with air-entraining agent and water evenly, and press it into aerated concrete, which is cut into 76×38×12mm 3 The bricks are cured with industrial waste gas containing 45% carbon dioxide wt. The curing gas pressure is 5bar, and the carbonization curing temperature is 50-100°C. After 15 hours of curing, finished bricks are made.
[0045] After carbonization curing, the weight increase of steel slag absorbs about 11% of carbon dioxide, and its compressive strength is 5.2MPa.
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