A kind of concrete and preparation method thereof
A concrete and mixture technology, applied in the field of building materials, can solve the problems of low concrete workability and large amount of cementing material, etc., and achieve good workability, easy construction and good economy
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[0025] The method for preparing the concrete provided by the invention comprises mixing a binder, a continuous grading mixture and water. Among them, the types and amounts of the cementing material and the continuous graded mixture are as mentioned above, and will not be repeated here.
[0026] The mixing can be carried out in a conventional manner, for example by means of a mixer. According to a preferred embodiment of the present invention, the way of mixing cement, continuous graded mixture and water is: (1) first mix cement, fine aggregate and water, (2) mix the obtained mixture with coarse bone mix. If a water reducer is used, the water reducer is preferably mixed in step (1).
[0027] The particles of fly ash are spherical, and its addition is helpful to the fluidization of concrete. Commonly used fly ash has very low cementitious properties and only affects the later strength of concrete. The inventors of the present invention found in research that the greater the ...
Embodiment 1
[0030] In the following examples, the determination method of the amount of fly ash added is as follows (taking embodiment 1 as example):
[0031] The unit weight of fly ash mixed with fine aggregate is represented by U, the weight of fly ash is represented by F, the S.S.D weight of fine aggregate is represented by Wa, the addition rate of fly ash is represented by F%, and F%=F / (F+Wa). Determine the relationship between U(y) and F%(x) according to the unit weight test (see standard GB / T14685-2001), and establish the quadratic curve regression equation "y=-5843.2x 2+946.78x+4760.9, R 2 =0.9251", so it can be calculated that when x=8%, y will take the maximum value, so the amount of fly ash (F) can be further determined according to the S.S.D weight of the fine aggregate.
Embodiment 1-4
[0033] The cement is ordinary portland cement of PO42.5, and its technical parameters conform to GB175-2007; the fly ash is grade two; the mineral powder is grade S95, and its 7-day activity is ≥75%, and the 28-day activity is ≥95%; aggregate The selection is shown in Table 1 below.
[0034] The preparation steps are: first fine aggregate (fine sand and coarse sand), cement, mineral powder, fly ash, water, polycarboxylate superplasticizer (water reducing rate is 25%, purchased from Shanghai Sanrui Chemical Co., Ltd. , during use, it is prepared into a solution with a solid content of 12wt.%) into a mixer and stirred for 45 seconds to form a mortar, and then the coarse aggregate (small stones and large stones) was dropped and stirred for 15 seconds to obtain concrete.
[0035] Referring to the standard GB / T50080-2002, measure the expansion of concrete with a slump bucket.
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