A kind of concrete containing industrial waste slag and its preparation method
A technology of industrial waste slag and concrete, which is applied in the field of building materials, can solve the problems of low activity of steel slag, inability to prepare high-strength concrete, and limit the utilization value of steel slag, and achieve the effect of high early strength
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[0032] The raw materials for preparing the concrete in the present invention also include 5-7 parts of water. The water-binder ratio is calculated based on the mass ratio of water and gelling material. The water-binder ratio in the present invention is preferably 0.26-0.32:1, more preferably 0.27-0.31:1, and still more preferably 0.28-0.30:1.
[0033] The present invention uses the above-mentioned components as raw materials, and successively pours and maintains to obtain concrete. The carbonation depth of the concrete reaches 3.7-4.9 mm, the splitting tensile strength reaches 55.5 MPa or more in 56 days, and the compressive strength reaches 54.7 MPa or more in 7 days. The daily compressive strength reaches above 69MPa, and the concrete grade reaches C60 and above.
[0034]The present invention also provides a method for preparing concrete containing industrial waste slag described in the above technical solution, comprising the following steps:
[0035] (1) mixing the cement...
Embodiment 1
[0046] The consumption of cementitious material, aggregate and water is respectively: 19.5 parts, 74.8 parts and 5.5 parts; Wherein,
[0047] The cementitious material consists of: 50% cement, 5% limestone powder, 23.5% steel slag powder, and 21.5% slag powder; the main chemical components and contents of limestone powder, steel slag powder and slag powder are shown in Table 1, and the rest are impurities or Minor ingredients, not listed;
[0048] The composition of the aggregate is as follows: the coarse aggregate is continuously graded limestone gravel with a particle size of 5-25mm, the content of needle flake particles is 8%, and the crushing value index is 13%; the gravel gradation: particle size [5mm, 10mm] Crushed stone accounts for 20%, and gravel with a particle size of (10mm, 25mm] accounts for 80%; the fineness modulus of fine aggregate is 3.4, and the sand rate is 38%;
[0049] The admixture is Sika 325C high-performance superplasticizer, and the dosage is 0.9% of...
Embodiment 2
[0055] The consumption of cementitious material, aggregate and water is respectively: 21 parts, 77 parts and 5 parts; Wherein,
[0056] The composition of the cementitious material is: cement 50%, limestone powder 8.5%, steel slag powder 16.5%, slag powder 25%;
[0057] The composition of the aggregate is: the coarse aggregate is continuously graded limestone gravel with a particle size of 5-25 mm, the content of needle flake particles is 8%, and the crushing value index is 13%. Stone accounts for 20%, gravel with particle size (10mm, 25mm] accounts for 80%; fine aggregate fineness modulus is 3.4, and sand rate is 38%;
[0058] The admixture is the same as the water reducing agent in Example 1, and the dosage is 0.9% of the total amount of the gelling material;
[0059] Unilateral water consumption 135kg / m 3 .
[0060] All the other are with embodiment 1.
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