A maintenance method for large-volume fly ash concrete
A concrete and large-volume technology, applied in the field of concrete maintenance, can solve the problems of slow heat transfer, high heat consumption, low early strength, etc., and achieve the effect of short maintenance period and low energy consumption
Active Publication Date: 2017-08-25
HENAN POLYTECHNIC UNIV
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Problems solved by technology
At present, in view of the low early strength of high-volume fly ash concrete, steam curing is mainly used to improve the strength
However, steam curing is a common thermal curing measure, the heat transfer is from outside to inside, the heat transfer speed is slow, the thermal efficiency is low, and the heat consumption is correspondingly large
Method used
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Embodiment 1
[0017] A maintenance method for large-volume fly ash concrete, the steps are as follows:
[0018] (1) Put 500g of fly ash, 500g of Portland cement clinker, and 320g of water together into a slurry mixer and mix evenly, and put the mixed concrete into a mold made of PEEK material, and its specification is 25mm× 25mm×25mm (length×width×thickness), during the molding process, attention should be paid to vibrating and compacting;
[0019] (2) Put the formed concrete together with the mold into a standard curing room for curing under standard conditions (temperature 20±1°C, humidity ≥95%);
[0020] (3) 2 hours after the final setting of the concrete, cover it with a plastic film together with the mold;
[0021] (4) Put the covered concrete into a microwave oven, and carry out microwave curing according to the different curing periods shown in Table 1; among them, A, B, and C represent: A—heat for 10 seconds and stop for 2 minutes; B—heat for 10 seconds and stop for 2 minutes; 20s...
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Abstract
The invention belongs to the technical field of concrete maintenance and discloses a maintenance method for large-volume fly ash concrete. Stir the large-volume fly ash cement evenly according to the specified water-binder ratio, put the mixed concrete into the mold made of PEEK material; cure the formed concrete together with the mold under standard conditions; wait for the final setting of the concrete After 1-2h, cover with plastic film together with the mold; put the covered concrete into the microwave oven, and carry out microwave curing according to the curing cycle of "A×3+B×10+C×8"; after microwave curing, take out the concrete , 3 hours after the microwave curing is terminated, it will be removed from the mold, and then it will be placed in a room temperature room, and it will be cured for 3 days with watering. When the present invention achieves the same effect as steam heat curing, it not only has short curing period, but also has the advantages of low energy consumption.
Description
technical field [0001] The invention belongs to the technical field of concrete maintenance, and in particular relates to a maintenance method for large-volume fly ash concrete. Background technique [0002] Fly ash is an active admixture, used in concrete instead of part of the concrete, showing activity effect, morphology effect, micro-aggregate effect and interface effect, which can effectively improve the workability and durability of concrete. Generally, the proportion of fly ash to replace concrete is 10~25wt%. In order to maximize the economic benefits and environmental protection effects of fly ash, in 1985, CANMET proposed the concept of large-volume fly ash concrete. However, with the increase of the proportion of fly ash replacing concrete, the early strength development of prefabricated parts is quite slow, which leads to the prolongation of on-site construction form removal time, slow turnover of prefabricated production formwork and other adverse consequences, ...
Claims
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IPC IPC(8): C04B40/00
Inventor 王雨利马玉祥杨佳白云杨雷史诗罗树琼
Owner HENAN POLYTECHNIC UNIV