Method for controlling proper mixing amount of polycarboxylic acid type admixture in premixed concrete
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A technology of ready-mixed concrete and polycarboxylate, which is applied in the direction of mixing operation control, chemical instruments and methods, mixing operation control devices, etc., can solve the problems of inability to control product quality and service, and achieve the effect of stable quality
Active Publication Date: 2022-03-25
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD +2
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The addition of admixtures in the prior art is based on experience, and the recommended dosage of the admixture manufacturer itself is a large range, which cannot serve the quality control of the actual concrete production process.
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Embodiment 1
[0055] This example is an application example of how to determine the change in the amount of admixture after the mix ratio of C30 concrete is changed after the raw material is changed.
[0056] C30 concrete mix ratio and methylene blue value calculation:
[0057] Table 3C30 concrete mix ratio and methylene blue value
[0058]
[0059] According to the calculation formula of the patent of the present invention, the calculation is as follows:
[0060] m 总 =∑(ΔMB i × m i ) / 1000=(0.1*312+0.5*465+0.1*300) / 1000=0.2937Kg
[0061] m 外固 = M 总 ×α=0.2937*0.2=0.05874Kg
[0062] The effective solid content of the polycarboxylate admixture used is 12%, and the amount of variation of the admixture can be obtained as:
[0063] W 外 = M 外含 / a=0.05874 / 0.12=0.4895Kg
[0064] Finally calculate the amount of admixture in the mixing ratio after the change of raw materials = 6.81 + 0.4895 = 7.3Kg
[0065] Through small trial mixing, the properties of C30 concrete at the initial stage ...
Embodiment 2
[0069] This embodiment is to illustrate the application of the patent of the present invention by taking a C50 concrete mix ratio as an example:
[0070] Table 4C50 concrete mix ratio and methylene blue value
[0071]
[0072] According to the calculation formula of the patent of the present invention, the calculation is as follows:
[0073] m 总 =∑(ΔMB i × m i ) / 1000=(0.1*1010-0.1*725) / 1000=0.282Kg
[0074] m 外固 = M 总 ×α=0.282*0.2=0.0564Kg
[0075] The effective solid content of the polycarboxylate additive used is 18%, can obtain:
[0076] W 外 = M 外含 / a=0.0564 / 0.18=0.3133
[0077] Finally, calculate the amount of admixture in the mixing ratio after the change of raw materials = 5.8 + 0.3133 = 6.113Kg, and through small trial mixing, the performance of the adjusted C50 concrete is as follows:
[0078] C50 Slump Expansion Ease of use 28-day compressive strength initial 225mm 520*520mm good 58.9Mpa Variety 220mm 510*520mm goo...
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Abstract
The invention discloses a method for controlling the appropriate mixing amount of a polycarboxylic acid additive in premixed concrete, various raw materials in the premixed concrete have different adsorption amounts for methylene blue powder, and the methylene blue values of the raw materials except the additive in the premixed concrete are obtained through tests. Obtaining the solid content of the polycarboxylic acid type additive corresponding to each kilogram of methylene blue powder, and calculating the adding amount of the polycarboxylic acid type additive needing to be increased by utilizing the amount of the increased methylene blue powder when the solid content of the used polycarboxylic acid type additive is known; therefore, on-site quality operators can adjust the use amount of the polycarboxylic acid-series admixture in the concrete mixing proportion according to the use amount of the polycarboxylic acid-series admixture. The mixing amount of the admixture is adjusted according to the change of the methylene blue value of the raw materials, the quality of the commodity concrete leaving the factory can be more stable, the method is high in applicability and adaptability and easy to operate, the quality stability of the commodity concrete leaving the factory is greatly improved, and the method can be popularized and applied to daily quality control of the commodity concrete.
Description
technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to a simple method for a suitable dosage of polycarboxylate admixture in ready-mixed concrete. Background technique [0002] The sensitivity of the polycarboxylate admixture in the concrete mixture to the unit water consumption and the fluctuation of the quality of raw materials such as sand and stone will always bring a lot of troubles to the technical quality management personnel of the production enterprise, because the water-binder ratio basically determines the quality of the concrete. The compressive strength, controlling the actual water consumption is a powerful means to control the quality of concrete; this determines that our usual method of controlling the quality of concrete is to adjust the amount of admixture, and for many years we have been based on "experience" or " "test" and some unrelated raw material testing indicators are guiding ...
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