A method for determining the compatibility of fly ash and water reducer in concrete
A technology of fly ash and water reducer, which is applied in the preparation of test samples, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, so as to control the incoming quality and ensure good quality. Incoming quality, simple operation effect
Active Publication Date: 2020-06-30
济南四建(集团)有限责任公司 +1
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Problems solved by technology
[0006] Aiming at the current lack of methods for measuring the adsorption capacity of fly ash to water reducers, the present invention provides a simple and rapid method for determining the compatibility of fly ash and water reducers
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Embodiment
[0023] Example Compatibility of fly ash and water reducer
[0024] Using 10 fly ash samples to draw a standard curve, the fineness of fly ash, loss on ignition, percentage of water demand, and methylene blue adsorption are shown in Table 1; 4 kinds of commonly used water reducing agents are used, the specific models and recommended additions As shown in table 2.
[0025] (1) Water demand for benchmark mortar: Weigh 250g of benchmark cement and 750 standard sand, add it to the mortar mixing pot, add water after stirring to make uniform mortar, measure the fluidity, and record the amount of water added when the fluidity is in the range of 130mm-140mm L 1 , the results are shown in Table 1;
[0026] (2) Water demand for fly ash mortar: Weigh 75g fly ash and 175g benchmark cement, add 750g standard sand to the mortar mixing pot, add water after stirring to make uniform mortar, measure the fluidity, and record the fluidity at The amount of water added in the range of 130mm-140mm...
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The invention discloses a method for measuring compatibility of fly ash with a water reducing agent in concrete. The method comprises the following steps: measuring a water demand of reference mortar and a water demand of fly ash mortar respectively; calculating a percentage of the water demand of fly ash according to the two; then, measuring fluidity of fly ash-containing net paste and change of the fluidity of net paste; finally, measuring the amount of methylene blue adsorbed in the fly ash, and judging the compatibility of the fly ash and the water reducing agent according to the amount of methylene blue adsorbed in the fly ash as follows: if the amount of adsorbed methylene blue is smaller than a certain value, the fly ash is a high-quality product and has excellent compatibility with the water reducing agent; if the amount of adsorbed methylene blue is in a certain range, the fly ash is a qualified product and has good compatibility with the water reducing agent; if the amount of adsorbed methylene blue is greater than a certain value, the fly ash is an unqualified product and has poor compatibility with the water reducing agent. The method provided by the invention is simple and convenient to operate, and rapidly judges the compatibility of the fly ash and the water reducing agent by comparing the amount of methylene blue adsorbed in the fly ash with fineness and ignition loss of the fly ash, so as to better control the quality of the fly ash entering the factory.
Description
technical field [0001] The invention relates to a method for measuring the compatibility of concrete admixtures, in particular to a method for the compatibility of fly ash and water reducers in concrete, and belongs to the field of building materials. Background technique [0002] With the widespread application of ready-mixed concrete, the design of concrete mix proportions not only considers the strength and durability of concrete, but also pays more attention to its workability. The compatibility of admixtures is an important factor affecting the workability of concrete. [0003] The emergence of admixtures, especially the application of high-performance water reducers, is a major development in concrete technology in recent years. Adding water-reducing agent into the concrete mixture can greatly reduce the water-cement ratio (down to 0.25-0.30) and increase the strength, or sharply improve the fluidity of the mixture (the slump can reach more than 20cm), so that The pro...
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IPC IPC(8): G01N21/78G01N1/38
CPCG01N1/38G01N21/78
Inventor 张冬詹伟唐宾娄德利马志超李海波陈朋强
Owner 济南四建(集团)有限责任公司