Self-compacting cement concrete mixed with Bayer process red mud, and preparation method thereof
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A technology of cement concrete and Bayer red mud, which is applied in the field of concrete materials to achieve the effect of high fluidity and good filling properties
Active Publication Date: 2019-11-15
GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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The above application methods have not completely digested the porcelain stone tailings produced, so it is necessary to find a new way to recycle the porcelain stone tailings
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Embodiment 1
[0027] Embodiment 1, preparation of thermally altered Bayer process red mud
[0028] A) Heat the crucible of the muffle furnace to 700°C, take out the crucible, put in a mixture of Bayer process red mud and porcelain stone tailings in a weight ratio of 1:0.5, and calcinate at 700°C for 2.0h;
[0029] B) The calcined product is naturally cooled in the muffle furnace, the calcined product is taken out, dry-milled with a ball mill, and passed through a 200-mesh sieve to obtain Bayer process red mud treated with thermal alteration.
[0030] Table 1 Calcination parameters
[0031] sample Weight ratio of red mud to porcelain stone tailings Calcination temperature Calcination time Red mud A 1:0.5 700℃ 2.0h Red mud B 1:0.3 600℃ 2.0h red mud C 1:0.1 700℃ 2.0h
[0032] Table 2 Example 2-4 self-compacting concrete mix parameters (kg / m 3 ):
[0033]
[0034]
[0035] Note: Coarse aggregate is composed of gravel with a particle size of 5-...
Embodiment 2
[0048] Example 2. Research on thermal activity of red mud by different calcination processes
[0049] Based on the calcination process of Example 1 of the present invention, different calcination processes are set:
[0050]Conventional calcination process ① (slow heating and slow cooling, separate calcination method): Put the Bayer process red mud into the muffle furnace, heat up to 700°C, and calcine for 2 hours. The calcined product is naturally cooled in the muffle furnace, and the calcined product is taken out , dry milled with a ball mill, and passed through a 200-mesh sieve. (red mud D)
[0051] Calcination process ② (slow heating and slow cooling, mixed calcination method): Put the mixture of Bayer process red mud and porcelain stone tailings at a weight ratio of 1:0.5 into a muffle furnace, heat up to 700°C, and calcine for 2 hours. The calcined product is naturally cooled in a muffle furnace, and the calcined product is taken out, dry-milled with a ball mill, and pa...
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Abstract
The invention relates to the technical field of concrete materials, and concretely relates to a self-compacting cement concrete mixed with Bayer process red mud, and a preparation method thereof. Theself-compacting concrete comprises, by weight, 100-155 parts of thermal alteration treated Bayer process red mud, 375-546 parts of a cementing material, 1450-1700 parts of aggregates, 5-8 parts of a polycarboxylic water reducer and 150-175 parts of water. Porcelain stone tailings are adopted to carry out thermal alteration treatment on the volcanic ash-free Bayer process red mud, so the effect ofincreasing the strength of the concrete and improving the shrinkage performance of the concrete by adding a small amount of the thermal alteration treated Bayer process red mud to the concrete is achieved; and the self-compacting concrete has the advantages of good filling property, good fluidity, high segregation resistance and high gap-passing ability, and has significant progress compared withconcretes in the prior art.
Description
technical field [0001] The invention relates to the technical field of concrete materials, in particular to a self-compacting cement concrete mixed with Bayer process red mud and a preparation method thereof. Background technique [0002] Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete referred to as SCC) means that under the action of its own gravity, it can flow and compact, even if there are dense steel bars, it can completely fill the formwork, and at the same time obtain good homogeneity without additional vibration Self-compacting concrete has the characteristics of low construction noise and high speed, which improves the construction environment and reduces the pollution of construction noise to the surrounding environment. Due to the above advantages, self-compacting concrete has gradually become a research hotspot in the field of construction. However, the drying shrinkage of self-compacting concrete is larger than that of ordinary...
Claims
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