Lime coal cinder powder stable regeneration concrete aggregates and preparation method thereof
A technology for recycling concrete and coal slag powder, applied in the field of building materials, can solve problems such as low utilization rate, achieve the effects of convenient material selection, solve environmental pollution, and enhance utilization value
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Embodiment 1
[0046] First, recycled concrete aggregates were produced by the following process.
[0047] Specifically, waste cement concrete road slabs, components of demolished buildings, waste cement concrete test blocks, etc. are collected and recycled; the recycled waste concrete is sequentially crushed for the first time, ribs removed, crushed for the second time, and obtained by screening. Recycled concrete aggregates in the particle size range are required; the mass percentages of the obtained recycled concrete aggregates passing through the following sieves are shown in Table 2.
[0048] Table 2 Content of recycled concrete aggregate passing through each sieve hole
[0049]
[0050] The resulting recycled concrete aggregate had a crush value of 22.6% and an apparent density of 2.69 g / cm 3 .
[0051]The sieving results in the above Table 2 were mixed according to the mass ratio of 43.4% rice sand, 19.2% melon seed slices, 23.5% small crushed and 13.9% medium crushed to obtain r...
Embodiment 2
[0060] First, recycled concrete aggregates were produced by the following process.
[0061] Specifically, waste cement concrete road slabs, demolished building components, waste cement concrete test blocks, etc. are collected and recycled; the recycled waste concrete is sequentially crushed, ribs removed, secondary crushed, and screened to obtain all Recycled concrete aggregates in the particle size range are required; the mass percentages of the obtained recycled concrete aggregates passing through the following sieve holes are shown in Table 4.
[0062] Table 4 The content of recycled concrete aggregate passing through each sieve hole
[0063]
[0064] The resulting recycled concrete aggregate had a crush value of 24.6% and an apparent density of 2.72 g / cm 3 .
[0065] The sieving results in the above Table 4 were mixed according to the mass ratio of 45.6% rice sand, 18.7% melon seed slices, 25.6% small crushed and 10.1% medium crushed to obtain recycled concrete aggreg...
Embodiment 3
[0070] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that in the present embodiment, the composite additive is 50% CaSO by mass percentage 4 2H 2 O and 50% by mass CaCl 2 Composition; The rest are described with reference to embodiment 1, obtain the lime cinder powder stabilized recycled concrete aggregate of the present embodiment.
[0071] Using the same measuring method as in Example 1, the performance of the lime cinder powder stabilized recycled concrete aggregate of this example was measured. According to the maximum dry density and optimum water content determined by the vibration test, 11.36% tap water with a mass of lime cinder powder stabilized recycled concrete aggregate was added to it for mixing, and the unconfined ages of 7d and 28d were measured respectively. The compressive strengths are 1.7...
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