Composite mineral additive for high-strength and high-performance concrete and method for preparing concrete

A high-performance concrete, composite mineral technology, used in the field of building materials to achieve high early strength, reduce drying and early shrinkage cracks

Inactive Publication Date: 2011-01-05
SHANGHAI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With a specific surface area ≥ 600m 2 /kg ultra-fine steel slag powder as mineral admixture to prepare concrete or use ultra-fine steel slag powder as core material and hemihydrate desulfurization gypsum, Ⅱ grade fly ash and slag powder to form composite mineral ad

Method used

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  • Composite mineral additive for high-strength and high-performance concrete and method for preparing concrete
  • Composite mineral additive for high-strength and high-performance concrete and method for preparing concrete
  • Composite mineral additive for high-strength and high-performance concrete and method for preparing concrete

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] Take 20.93g of ultrafine steel slag powder (15%), 6.07g of semi-hydrated desulfurized gypsum (5%), 47.25g of grade II fly ash (35%), and 60.75g of grade S95 slag powder (45%), and mix them evenly. Then, a composite mineral admixture for high-strength and high-performance concrete (No. 1) was prepared, and tested according to the activity test method for composite mineral admixtures for high-strength and high-performance concrete promulgated by the country in GB / T18736-2002. The 3d, For the compressive strength of 7d and 28d, see Table 1 for specific test data.

[0033] Table 1 Example 1 of composite mineral admixture for high-strength and high-performance concrete

[0034]

[0035] It can be seen from Table 1 that the activity index of compound mineral admixtures for high-strength and high-performance concrete No. 1 is significantly higher than the standards for similar products specified in the promulgated GB / T18736-2002 national standard.

Example Embodiment

[0036] Example 2

[0037] Take 13.50g of ultra-fine steel slag powder (10%), 3.4g of semi-hydrated desulfurized gypsum (2.5%), 67.5g of grade II fly ash (50%), and 50.6g of grade S95 slag powder (37.5%), and mix them evenly. Afterwards, a composite mineral admixture for high-strength and high-performance concrete (No. 2) was made, and tested according to the activity test method for composite mineral admixtures for high-strength and high-performance concrete promulgated by the country in GB / T18736-2002. The 3d, For the compressive strength of 7d and 28d, see Table 2 for specific test data.

[0038] Table 2 Example 2 of composite mineral admixtures for high-strength and high-performance concrete

[0039]

[0040] It can be seen from Table 2 that the activity index of compound mineral admixtures for high-strength and high-performance concrete No. 2 is significantly higher than that of similar products specified in the promulgated GB / T18736-2002 national standard.

Example Embodiment

[0041] Example 3

[0042] Take 17g of ultra-fine steel slag powder (12.6%), 4.6g of semi-hydrated desulfurized gypsum (3.4%), 58g of grade II fly ash (43%), and 55.4g of grade S95 slag powder (41%), stir and mix evenly. A composite mineral admixture for high-strength and high-performance concrete (No. 3) was prepared, and tested according to the activity test method for composite mineral admixtures for high-strength and high-performance concrete promulgated by the country in GB / T18736-2002, and its 3d, 7d, For the 28d compressive strength, see Table 3 for specific test data.

[0043] Table 3 Example 3 of composite mineral admixture for high-strength and high-performance concrete

[0044]

[0045] It can be seen from Example (3) of Table 3 that the activity index of composite mineral admixtures for high-strength and high-performance concrete No. 3 is significantly higher than the standards for similar products specified in the promulgated GB / T18736-2002 national standard

[0046] Con...

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Abstract

The invention discloses a composite mineral additive for high-strength and high-performance concrete and a method for preparing concrete. The composite mineral additive for the high-strength and high-performance concrete comprises superfine steel slag micro powder as a core material as well as hemihydrate desulfurization gypsum, II-level pulverized fuel ash and mineral slag. The preparation method of the composite mineral additive comprises the following steps of: placing raw materials in a mixer, and then mechanically stirring and uniformly mixing to form the composite mineral additive for the high-strength and high-performance concrete. The composite mineral additive for the high-strength and high-performance concrete, obtained in the method, has high early-stage strength in 3 days, the activity index is not less than 80%, and the activity index in 28 days is not less than S95%, which is higher than the standard of the issued state and local like products; and when used for preparing the concrete, the composite mineral additive can equivalently replace more than 60% of 52.5-level ordinary Portland cement, and meanwhile fragments generated by producing above 75% of broken stones can also be utilized for replacing natural sand, thereby low-carbon concrete having good durability and meeting the circulated economic requirement is produced.

Description

technical field [0001] The invention relates to a composite mineral admixture for high-strength and high-performance concrete and a method for preparing concrete, belonging to the technical field of building materials. Background technique [0002] Mineral admixtures for high-strength and high-performance concrete (GB / T18736-2002) standards promulgated by the state only have monomer technical standards for ground slag powder, ground fly ash, ground zeolite powder and silica fume, and there is no steel slag Technical standards for composite mineral admixtures of powder and desulfurized gypsum. In addition, the main technical indicators of the first-grade steel slag powder (GB / T20491-2006) used in cement and concrete promulgated by the state: specific surface area ≥ 400m 2 / kg; activity index ≥ 65% for 7 days; ≥ 80% for 28 days; the composite steel slag powder in the technical regulation CDG / TJ08-2013-2007 promulgated by Shanghai is composed of slag powder, fly ash, silica fu...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B28/04C04B18/08C04B18/14C04B18/12
CPCY02W30/91
Inventor 陆文雄樊钧施钟毅曹栋樑施庆安
Owner SHANGHAI UNIV
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