CN107247048B - Method for determining compatibility of fly ash and water reducing agent in concrete - Google Patents
Method for determining compatibility of fly ash and water reducing agent in concrete Download PDFInfo
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- CN107247048B CN107247048B CN201710419378.9A CN201710419378A CN107247048B CN 107247048 B CN107247048 B CN 107247048B CN 201710419378 A CN201710419378 A CN 201710419378A CN 107247048 B CN107247048 B CN 107247048B
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Abstract
The invention discloses a method for realizing compatibility of fly ash and a water reducing agent in concrete, which comprises the following steps: respectively measuring the water demand of the reference mortar and the water demand of the fly ash mortar, and calculating the percentage of the water demand of the fly ash according to the water demand of the reference mortar and the water demand of the fly ash mortar; then, measuring the net slurry fluidity and the net slurry fluidity change of the fly ash; finally, measuring the adsorption quantity of the fly ash methylene blue; judging the compatibility of the fly ash and the water reducing agent according to the methylene blue adsorption quantity of the fly ash: the methylene blue adsorption capacity is less than a certain value, the fly ash is a high-quality product and has excellent compatibility with the water reducing agent; the adsorption capacity of the methylene blue is in a certain range, the fly ash is qualified and has good compatibility with the water reducing agent; the methylene blue adsorption capacity is larger than a certain value, and the fly ash is unqualified and has poor compatibility with the water reducing agent. The method of the invention is simple and convenient to operate; the compatibility of the fly ash and the water reducing agent is rapidly judged by comparing the adsorption capacity of the fly ash to the methylene blue solution with the fineness of the fly ash and the ignition loss, and the quality of the fly ash entering a factory is better controlled.
Description
Technical Field
The invention relates to a method for determining the compatibility of a concrete additive, in particular to a method for determining the compatibility of fly ash and a water reducing agent in concrete, belonging to the field of building materials.
Background
With the wide application of premixed concrete, the working performance of the concrete is emphasized more besides the strength and durability of the concrete in the design of the mixing proportion of the concrete, and the compatibility among additives is an important factor influencing the working performance of the concrete.
The appearance of the admixture, especially the application of the high-performance water reducing agent, is a great development of concrete technology in recent years. The water reducing agent is added into the concrete mixture, so that the water-cement ratio can be greatly reduced (to 0.25-0.30) and the strength can be improved, or the fluidity of the mixture can be sharply improved (the slump can reach more than 20 cm), the processes of mixing, conveying, pouring, forming and the like of the mixture are easy to operate, and the performance of the concrete is improved. The concrete water reducing agent is an amphiphilic polymer, and can absorb and disperse cement particles when added into concrete, release moisture contained in a cement aggregate and enhance the lubricating effect among cement particles, so that the workability of the concrete is improved, and the pouring property, the strength and the compactness of the concrete are improved. According to the development process, water reducing agents can be classified into three types, namely lignosulphonates (first generation), naphthalene sulfonic acid formaldehyde condensates and melamine resins (second generation) and polycarboxylic acid high-performance water reducing agents (third generation). The high-efficiency water reducing agent not only greatly improves the mechanical property of high-strength concrete, but also provides a simple and easy construction process, and the high-efficiency water reducing agent widely used in China at present mainly comprises naphthalene series and polycarboxylic acid series products.
The fly ash is used as an artificial pozzolanic material, is used as a blending material in concrete, belongs to a mineral admixture, can improve the performance, saves cement, improves the engineering quality and reduces the cost. The fly ash is added into the concrete, so that a large amount of cement and fine aggregate can be saved, the water consumption is reduced, the workability of concrete mixture is improved, the pumpability of the concrete is enhanced, the creep of the concrete is reduced, the hydration heat and the thermal expansion are reduced, the anti-permeability capability of the concrete is improved, and the modification property of the concrete is increased. The fly ash is powder collected from flue gas of a power plant pulverized coal furnace, and due to the improvement of a combustion process of the power plant, the ignition loss of the fly ash is gradually reduced, and the ignition loss of most of the fly ash can be controlled within 5%. However, some fly ash residual sieve can not be controlled within 25%, suppliers achieve the standard of class i fly ash or class ii fly ash by performing secondary grinding on class iii fly ash or fly ash with larger residual sieve, the screen remnants mainly comprise unburned fly ash particles, the pulverized fly ash can adsorb additives in large concrete, and the concrete state is greatly influenced, but the method for detecting the loss of the fly ash in the current standard in China can not really and effectively judge the situation.
Therefore, a method for simply, conveniently and rapidly measuring the adsorption capacity of the fly ash to the concrete admixture is needed in production.
Disclosure of Invention
Aiming at the problem that the method for measuring the adsorption capacity of the fly ash to the water reducing agent is lacked at present, the invention provides a method for simply, conveniently and rapidly measuring the compatibility of the fly ash and the water reducing agent.
In order to achieve the purpose, the invention adopts the following technical scheme.
A method for determining the compatibility of fly ash and a water reducing agent comprises the following steps:
(1) the water requirement of the standard mortar is as follows: weighing reference cement and standard sand, adding into a mortar stirring pot, stirring, adding water, stirring to obtain uniform mortar, measuring fluidity, and recording water addition amount L of fluidity in 130-140 mm range1；
(2) Water requirement of fly ash mortar: replacing part of reference cement with fly ash, weighing, adding into a mortar mixing pot together with standard sand, stirring, adding water, stirring to obtain uniform mortar, measuring fluidity, and recording water addition L with fluidity of 130-140 mm2；
(3) The water requirement percentage of the fly ash is as follows: the water demand percentage of the fly ash is
；
(4) Net pulp fluidity: drying the fly ash to be detected and the reference cement to a constant weight, uniformly mixing the fly ash and the reference cement with a recommended amount of water reducing agent, and mixing the mixture to obtain a samplePouring into a stirring pot, adding water
Mixing to obtain pure slurry; determination of the neat paste fluidity within 30 s: taking the average value of the maximum diameters of the flowing cement paste in two mutually perpendicular directions as the fluidity M of the paste;
(5) change in net pulp fluidity: adding water into the residual pure pulp obtained in the step (4), starting a stirrer for 4min, respectively measuring the fluidity of the pure pulp at corresponding time according to the step (4), and calculating the change delta M of the fluidity of the pure pulp at 60min60；
(6) Adsorption of fly ash with methylene blue: weighing the fly ash which is dried to constant weight and has the same mass as that in the step (4), adding the fly ash into water, and stirring to obtain suspension; adding a certain amount of methylene blue solution into the suspension under stirring, and stirring for a period of time t; dipping a drop of the suspension on a filter paper (placed on an empty beaker or other suitable support so that the filter paper surface does not come into contact with any solid or liquid) with a glass rod; if no color halo appears around the precipitate, repeating the process until a stable light blue color halo appears around the precipitate, recording the dosage of the methylene blue solution, and calculating the amount m of the fly ash adsorbing the methylene blue;
(7) and (3) judging the compatibility of the fly ash and the water reducing agent: carrying out methylene blue adsorption quantity measurement on each batch of fly ash according to the step (6); the absorption capacity of methylene blue is less than a certain value, the change of the fluidity of the net slurry is small, the using amount of the water reducing agent does not need to be adjusted, and the fly ash is a high-quality product and has excellent compatibility with the water reducing agent; the methylene blue adsorption capacity is in a certain range, the loss of the fluidity of the net slurry can be compensated by adjusting the using amount of the water reducing agent in a recommended range, and the fly ash is a qualified product and has good compatibility with the water reducing agent; the methylene blue adsorption capacity is larger than a certain value, the net slurry fluidity is changed greatly, the loss of the net slurry fluidity cannot be compensated by adjusting the using amount of the water reducing agent within the recommended range, and the fly ash is unqualified and has poor compatibility with the water reducing agent.
The drying temperature is 105 +/-5 ℃.
The water reducing agent is selected from a naphthalene water reducing agent, a polycarboxylic acid water reducing agent or a mixture of a naphthalene water reducing agent and a fatty acid water reducing agent.
The mass ratio of the reference cement to the standard sand in the step (1) is 1: 4.
The mass ratio of the fly ash, the reference cement and the standard sand in the step (2) is 1:3: 16.
The mass ratio of the fly ash and the reference cement in the step (4) is 1: 3.
The invention has the following advantages: the method of the invention is simple and convenient to operate; the compatibility of the fly ash and the water reducing agent is rapidly judged by comparing the adsorption capacity of the fly ash to the methylene blue solution with the fineness of the fly ash and the ignition loss, and the quality of the fly ash entering a factory is better controlled.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example compatibility of fly ash with Water reducing agent
10 fly ash samples are adopted to draw a standard curve, and the fineness of the fly ash, the loss on ignition, the percentage of water demand and the methylene blue adsorption are shown in table 1; 4 common water reducing agents are adopted, and the specific types and recommended addition amount are shown in Table 2.
(1) The water requirement of the standard mortar is as follows: weighing 250g of reference cement and 750g of standard sand, adding the reference cement and the 750g of standard sand into a mortar stirring pot, adding water after stirring to obtain uniform mortar, measuring the fluidity, and recording the water adding amount L of the fluidity within the range of 130mm-140mm1The results are shown in table 1;
(2) water requirement of fly ash mortar: weighing 75g of fly ash and 175g of reference cement, adding the fly ash and 750g of standard sand into a mortar stirring pot, adding water after stirring to obtain uniform mortar, measuring fluidity, and recording the water addition amount L of the fluidity within the range of 130mm-140mm2The results are shown in table 1;
(3) the water requirement percentage of the fly ash is as follows: the water demand percentage of the fly ash is
The results are shown in table 1;
(4) net pulp fluidity: 150g of fly ash to be detected and 45 g of fly ash to be detected are mixed0g of reference cement is dried at 105 +/-5 ℃ to constant weight, is uniformly mixed with the recommended amount of water reducing agent, and the mixed sample is poured into a stirring pot according to the weight ratio
Adding water and stirring to obtain pure slurry; determination of the neat paste fluidity within 30 s: the average value of the maximum diameters of the flowing cement paste in two mutually perpendicular directions is taken as the fluidity M of the paste, and the result is shown in Table 3;
(5) change in net pulp fluidity: adding water into the residual pure pulp obtained in the step (4), starting a stirrer for 4min, respectively measuring the fluidity of the pure pulp at corresponding time according to the step (4), and calculating the change delta M of the fluidity of the pure pulp at 60min60The results are shown in Table 3;
(6) adsorption of fly ash with methylene blue: weighing 150g of fly ash dried to constant weight at 105 +/-5 ℃, adding the fly ash into water, and stirring to obtain suspension; adding a certain amount of 0.5% methylene blue solution into the suspension under stirring, and stirring for a period of time t; dipping a drop of the suspension on a filter paper (placed on an empty beaker or other suitable support so that the filter paper surface does not come into contact with any solid or liquid) with a glass rod; if no color halo appears around the precipitate, repeating the process until stable light blue color halo appears around the precipitate, recording the dosage of methylene blue solution, and calculating the amount m of the fly ash adsorbing the methylene blue, wherein the result is shown in table 1;
(7) and (3) judging the compatibility of the fly ash and the water reducing agent: carrying out methylene blue adsorption quantity measurement on each batch of fly ash according to the step (6), wherein the methylene blue adsorption quantity is shown in table 4; when the methylene blue adsorption capacity is less than 125mg, the change of the fluidity of the neat paste is small, the compatibility is good, the amount of the water reducing agent does not need to be adjusted, and the fly ash is a high-quality product; when the methylene blue adsorption quantity is 125-200mg, the loss of net slurry fluidity can be compensated to be qualified products by adjusting the using amount of the water reducing agent within the recommended range; when the methylene blue adsorption capacity is more than 200mg, the net slurry fluidity is changed greatly, and the unqualified product cannot compensate the net slurry fluidity loss by adjusting the using amount of the water reducing agent within the recommended range.
Through analysis of the adsorption capacity of the 5 batches of fly ash on methylene blue solution, the data in Table 4 show that the 20161207 batch of fly ash with methylene blue adsorption capacity within 125mg is a high-quality product, the loss of net slurry fluidity is small, and the compatibility with the water reducer is excellent; the methylene blue adsorption quantity of the batch of the fly ash of 20160811, 20161011 and 20161220 is 125-200mg, the initial fluidity is slightly small, the adsorption quantity to the water reducing agent is slightly large, the loss of the fluidity of the net slurry is slightly large, but the requirement of the fluidity of the net slurry after 60min can be met by increasing the mixing quantity of the water reducing agent by 0.1-0.2%, and the compatibility with the water reducing agent is good; 20160830 batches of the water reducing agent are unqualified products with methylene blue adsorption capacity exceeding 200mg, the initial fluidity is small, the adsorption capacity to the water reducing agent is large, the loss of the fluidity of the net slurry is large, the cost of the water reducing agent is greatly improved by increasing the mixing amount of the water reducing agent, and the compatibility with the water reducing agent is poor.
TABLE 1 Mass index, percentage of water demand and methylene blue adsorption of each batch of fly ash
TABLE 2 recommended addition amounts of the water-reducing agents
TABLE 3 Change in neat paste fluidity for each fly ash sample
TABLE 45 methylene blue adsorption of batch fly ash samples
Claims (6)
1. A method for determining the compatibility of fly ash and a water reducing agent is characterized by comprising the following steps:
(1) the water requirement of the standard mortar is as follows: weighing reference cement and standard sand, adding into a mortar stirring pot, stirring, adding water, stirring to obtain uniform mortar, and measuring fluidityRecording the water adding amount L with the fluidity within the range of 130mm-140mm1；
(2) Water requirement of fly ash mortar: replacing part of reference cement with fly ash, weighing, adding into a mortar mixing pot together with standard sand, stirring, adding water, stirring to obtain uniform mortar, measuring fluidity, and recording water addition L with fluidity of 130-140 mm2；
(3) The water requirement percentage of the fly ash is as follows: the water demand percentage of the fly ash is
；
(4) Net pulp fluidity: drying the fly ash to be detected and the reference cement to a constant weight, uniformly mixing the fly ash and the reference cement with a recommended amount of water reducing agent, pouring the mixed sample into a stirring pot, and adding water
Mixing to obtain pure slurry; determination of the neat paste fluidity within 30 s: taking the average value of the maximum diameters of the flowing cement paste in two mutually perpendicular directions as the fluidity M of the paste;
(5) change in net pulp fluidity: adding water into the residual pure pulp obtained in the step (4), starting a stirrer for 4min, respectively measuring the fluidity of the pure pulp at corresponding time according to the step (4), and calculating the change delta M of the fluidity of the pure pulp at 60min60；
(6) Adsorption of fly ash with methylene blue: weighing the fly ash which is dried to constant weight and has the same mass as that in the step (4), adding the fly ash into water, and stirring to obtain suspension; adding a certain amount of methylene blue solution into the suspension under stirring, and stirring for a period of time t; dipping a drop of the suspension on a filter paper with a glass rod, and placing the filter paper on an empty beaker or other suitable support so that the surface of the filter paper does not contact any solid or liquid; if no color halo appears around the precipitate, repeating the process until a stable light blue color halo appears around the precipitate, recording the dosage of the methylene blue solution, and calculating the amount m of the fly ash adsorbing the methylene blue;
(7) standard curve of fly ash methylene blue adsorption-neat paste fluidity change: in different batchesThe quantity M of the secondary fly ash for adsorbing methylene blue is a horizontal coordinate, and the change delta M of the fluidity of the clean slurry is calculated according to the 60min60Drawing a standard curve for the ordinate;
(8) and (3) judging the compatibility of the fly ash and the water reducing agent: carrying out methylene blue adsorption quantity measurement on each batch of fly ash according to the step (6); the absorption capacity of methylene blue is less than a certain value, the change of the fluidity of the net slurry is small, the using amount of the water reducing agent does not need to be adjusted, and the fly ash is a high-quality product and has excellent compatibility with the water reducing agent; the methylene blue adsorption capacity is in a certain range, the loss of the fluidity of the net slurry can be compensated by adjusting the using amount of the water reducing agent in a recommended range, and the fly ash is a qualified product and has good compatibility with the water reducing agent; the methylene blue adsorption capacity is larger than a certain value, the net slurry fluidity is changed greatly, the loss of the net slurry fluidity cannot be compensated by adjusting the using amount of the water reducing agent within the recommended range, and the fly ash is unqualified and has poor compatibility with the water reducing agent.
2. The method of claim 1, wherein the drying temperature is 105 ± 5 ℃.
3. The method of claim 1, wherein the water reducing agent is selected from the group consisting of naphthalene based water reducing agents, polycarboxylic acid based water reducing agents, and mixtures of naphthalene based and fatty acid based water reducing agents.
4. The method of claim 1, wherein the mass ratio of the reference cement to the standard sand in step (1) is 1: 4.
5. The method according to claim 1, wherein the mass ratio of the fly ash, the reference cement and the standard sand in the step (2) is 1:3: 16.
6. The method according to claim 1, wherein the mass ratio of the fly ash to the reference cement in the step (4) is 1: 3.
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| CN110286194A (en) * | 2019-06-27 | 2019-09-27 | 广州市建筑科学研究院有限公司 | The detection method and application of slow release slump retaining polycarboxylate water reducer sustained release performance |
| CN112083138B (en) * | 2020-09-15 | 2022-11-01 | 中建西部建设西南有限公司 | Method for judging whether waste slurry water of mixing plant can be used for concrete production |
| CN114227914B (en) * | 2021-12-14 | 2023-05-09 | 上海建工建材科技集团股份有限公司 | Method for controlling proper mixing amount of polycarboxylic acid additive in ready-mixed concrete |
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