Composite high-early strength blending material for unballasted track plate and use thereof
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A ballastless track and admixture technology, applied in the field of building materials, can solve the problems of not meeting the technical requirements of ballastless track slabs, limited strength growth, and durability problems
Active Publication Date: 2009-07-08
BEIJING ZHONGYANYI ENG TECH DEV CENT
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The ballastless track technology of the German BOGL company used in the construction of the Beijing-Tianjin Passenger Dedicated Line belongs to the slab ballastless track technology. ~600m 2 /kg ultra-fine P.I52.5 cement to prepare concrete, and use ultra-fine cement to prepare Borg board in China, the following problems will be encountered: (1) Ultra-fine cement greatly increases the production cost of Bourg board
(2) Ultra-fine cement is not a bulk product. When there is a large
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[0026] Example 1:
[0027] Preparation: The dosage of each component material in 50kg admixture (excluding activator) is:
[0028] A (silica fume) 70% 35kg
[0029] B (calcium oxide) 10% 5kg
[0030] C(Fine ground zeolite powder, specific surface area is 400m 2 / kg~800m 2 / kg)10% 5kg
[0031] D (fly ash) 10% 5kg
[0032] F alcohol amines (triethanolamine) three ten thousandths 15g
[0033] The above components A, B, C, D, and F are fully mixed to obtain blend 1 of the wood example.
[0034] Performance test of admixture:
[0035] According to the standard of ground slag powder (GB / T 18736), the composite early-strength admixture (product code ZYY) of Example 1 was tested. The specific performance indexes are shown in Table 1. The analysis shows that the admixture fully meets the relevant regulations in the "Interim Technical Conditions for High Performance Concrete for Passenger Dedicated Lines".
[0036] Table 1 Performance indicators of composite early-strength admixture ZYY
[...
Example
[0045]Analyzing the values in Table 3, it can be seen that the types of admixtures have a greater impact on the development of the early strength of concrete. The 16h strength of concrete mixed with fly ash or slag alone is lower; with about 8% silica fume, although the late strength Higher, it is also more conducive to improving the early strength of concrete than admixtures 1 to 3, but its 16h compressive strength is still lower than the standard (>48MPa) requirement. Incorporating the ZYY composite early-strength mineral admixture of the present invention, the 16h strength of the concrete is higher than that of the 8% silica fume concrete, and the 16h strength is the highest among all the mixing ratios. Therefore, the incorporation of ZYY composite early-strength mineral admixture has a very obvious effect on promoting the early strength of concrete. Example 2 ~ Example 6
[0046] In the same manner as in Example 1, the admixture was prepared according to the composition of T...
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Abstract
The invention discloses a composite early strength admixture for an unballasted track plate and application of the admixture and relates to the field of building material. The admixture consists of 50 to 70 weight percent of a silicon reinforcing material (A), 0 to 20 weight percent of a carbonate reinforcing material (B), 0 to 20 weight percent of an aluminium-silicon reinforcing material (C), 0to 20 weight percent of a silicon filling material (D), 0 to 20 weight percent of an aluminum filling material (E) and an excitant (F) in combined preparation, wherein B, C, D and E are not zero simultaneously; and the use amount of the excitant (F) is 0 to 5 weight percent of gross weight of (A+B+C+D+E). The admixture is applied to the manufacture of the unballasted track plate, can offset the insufficiency of concrete performance brought by the replacement of ultrafine cement by common silicate or silicate cement; collapse degree of the applied concrete is between 140 and 200 mm; 16h compressive strength is more than 48 MPa; and the high-performance concrete for the unballasted track plate fully meets the technical requirement of a provisional technical condition for high performance concrete in a passenger transportation dedicated line.
Description
technical field [0001] The invention relates to the technical field of building materials, in particular to an admixture for ballastless track slabs. Background technique [0002] Ballastless track is a track structure composed of concrete or asphalt mixture instead of granular ballast bed. It has the characteristics of high track smoothness, good rigidity uniformity, long-term maintenance of track geometric shape and potential energy, and significantly reduced maintenance workload. , the train runs faster and more smoothly on it, which is the development direction of high-speed railway engineering technology and is also the most advanced track technology in the world today. [0003] Concrete mixture is generally obtained by mixing cement, sand, gravel and water in proportion. The ballastless track technology of the German BOGL company used in the construction of the Beijing-Tianjin Passenger Dedicated Line belongs to the slab ballastless track technology. ~600m 2 / kg ult...
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