CN107721226B - Pre-wetting time control method for brick-rich recycled coarse aggregate - Google Patents

Pre-wetting time control method for brick-rich recycled coarse aggregate Download PDF

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Publication number
CN107721226B
CN107721226B CN201711156318.9A CN201711156318A CN107721226B CN 107721226 B CN107721226 B CN 107721226B CN 201711156318 A CN201711156318 A CN 201711156318A CN 107721226 B CN107721226 B CN 107721226B
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coarse aggregate
water absorption
aggregate
brick
recycled coarse
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CN107721226A (en
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郭利霞
钟凌
郭磊
田园
武潇
孙文
卓佐昊
赵一鸣
欧昌雪
杨絮
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North China University of Water Resources and Electric Power
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1088—Water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention provides a control method of the prewetting time of brick-rich recycled coarse aggregate, which prewets the brick-rich recycled coarse aggregate according to the requirements of different saturation degrees of the brick-rich recycled coarse aggregate, so that the prewetting time of the brick-rich recycled coarse aggregate is prevented from being too long, a prewetting field is occupied, the time is wasted, and the production efficiency is reduced; too short to meet the saturation requirement of the recycled coarse aggregate rich in bricks.

Description

Pre-wetting time control method for brick-rich recycled coarse aggregate
Technical Field
The invention relates to a control method of aggregate pre-wetting time, in particular to a control method of pre-wetting time of brick-rich recycled coarse aggregate.
Background
The recycled aggregate is an important component of recycled concrete, can solve the problems of stacking, land occupation and the like of waste construction waste, has remarkable social, economic and environmental benefits, and is a sustainable development building material.
The recycled aggregate is classified by referring to common concrete, more than 5mm is coarse aggregate, less than 5mm is fine aggregate, and the recycled aggregate is mostly derived from waste building garbage removed in urban construction, and is formed by utilizing concrete and fragments of masonry debris in the waste building garbage through a series of treatments. Building rubbish hardly realizes the complete separation of abandonment concrete and waste brick, because the regeneration brick aggregate that waste brick piece was made has characteristics such as intensity is low, the porosity is big, water-absorbing capacity is strong for the regeneration concrete performance by a wide margin who is made by it descends, and research shows: with the increase of the content of the waste bricks in the recycled aggregate, the total water consumption is continuously increased, the cohesiveness and the water-retaining property of the recycled aggregate concrete are reduced, the carbonization depth and the chloride ion diffusion coefficient of the recycled concrete are gradually increased, the durability is reduced, and the strength is reduced. Similarly, other recycled brick-rich products such as blocks, permeable bricks, etc. have poor properties.
How to adopt an economic and reliable means to improve the properties of the recycled aggregate rich in brick grains so as to improve the performance of recycled concrete is a current hot problem. For porous aggregates with high water absorption, the performance of the aggregates can be improved by pre-wetting treatment, because untreated coarse aggregates absorb water in the concrete stirring preparation process due to high water absorption, reduce fluidity, cause insufficient hydration of a gelled material and reduce strength; the pre-wetting treatment is carried out, the aggregate does not absorb the hydration water, the hydration degree of the cementing material is ensured, but the internal humidity of the cement paste is gradually reduced along with the progress of the concrete hydration, the moisture in the aggregate is released and returned to the cement paste for continuous hydration, and the later strength of the concrete is favorably increased. The method is used for producing the recycled concrete, the additional water consumption is generally determined by subtracting the water absorption capacity in an air-dry state from the water absorption capacity in a saturated state, and the saturated pre-wetting treatment is an important link in the factory production of the batched recycled concrete. However, the control of the pre-wetting time is difficult to determine, when general manufacturers produce recycled concrete products, the aggregates are directly washed by water, the aggregates are too dry to reach an ideal state, if the aggregates are soaked for a long time, the production field is too long, the mass production time is prolonged, and the pre-wetting time and control measures are necessary to be researched to improve the performance of the recycled products.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling the prewetting time of brick-rich recycled coarse aggregate.
The object of the invention is achieved in the following way: a control method for the prewetting time of brick-rich recycled coarse aggregate comprises the following steps:
(1) collecting brick-rich construction waste treated in the same batch, wherein the brick-rich recycled coarse aggregate is aggregate with brick content of more than 90%, and crushing, separating, screening and grading the aggregate to obtain graded recycled coarse aggregate;
(2) washing the graded recycled coarse aggregate with water, removing chips, dust and impurities on the surface of the recycled coarse aggregate, and airing for more than 2 days to achieve an air-dry state which is balanced with the humidity of the surrounding environment;
(3) according to GB/T17431.2-1998 part 2 of lightweight aggregate and test method thereof, namely lightweight aggregate test method, the water absorption capacity and water absorption rate of the recycled coarse aggregate are respectively obtained within 5min, 10min, 15min, 20min, 30min, 60min, 120min, 360min, 960min, 1440min and 2880 min;
(4) fitting according to the test data to obtain a relational expression of the water absorption capacity and the water absorption time of the recycled coarse aggregate, namely a water absorption capacity formula;
(5) preparing gradation according to the type of the produced product, determining the particle size and the using amount of the needed coarse aggregate, and calculating the pre-wetting control time under the saturation required by the recycled coarse aggregate according to the water absorption formula obtained in the step (4);
(6) and pre-wetting the recycled coarse aggregate according to the calculated water absorption time, passing the pre-wetted recycled coarse aggregate through a vibrating water absorption cloth, and simultaneously mechanically blowing to reach a state that internal pore water is saturated and the surface is dry.
The step (1) is that the crushed brick-rich construction waste is sieved and classified according to the grain sizes of 0-5mm, 5-10mm,10-20mm, 20-30mm and more than 30 mm.
The saturation in the step (5) is the saturation of pore water of the coarse aggregate:(ii) a WhereinKg as maximum water absorption; wRCA(t) water absorption at time t, g; and Ps is the saturation of pore water of the coarse aggregate. The concrete is prepared by adopting coarse aggregate, and the saturation degree of pore water of the coarse aggregate isThe method is used for representing the characteristic value of whether the moisture in the coarse aggregate is supplemented to the cement paste or not, if the aggregate saturation is larger than the cement paste saturation, the aggregate moisture is supplemented to the cement paste, the water cement ratio of the concrete is increased, and the concrete strength is reduced.
The relation between the water absorption capacity of the recycled coarse aggregate and the water absorption time adopts a logarithmic form, and the form naturally meets the condition that the independent variable t is greater than 0, so that the structure is simpler compared with other forms;
in the step (4), the formula of the water absorption capacity is，WRCAM is the water absorption capacityRCAThe g and A, B are empirical values and are obtained by fitting experimental data, and t is the water absorption time and min.
The saturation degree required by the recycled coarse aggregate in the step (5) is 90% -96%, the brick-rich recycled coarse aggregate has good property and longer pre-wetting time under the saturation degree, the saturation degree of the brick-rich recycled coarse aggregate is slightly increased, the pre-wetting time is shorter, and the brick-rich recycled coarse aggregate is easy to absorb water in the concrete preparation process, so that the fluidity is reduced, the cementing material is not fully hydrated, and the strength is reduced.
The bricks are fired shale bricks, clay sintered bricks, coal gangue bricks, fly ash bricks and the like.
The brick-rich recycled coarse aggregate is the aggregate with the brick content of more than 90 percent.
According to the invention, the brick-rich recycled coarse aggregate can be pre-wetted according to the requirements of different saturation degrees of the brick-rich recycled coarse aggregate, so that the problems that the brick-rich recycled coarse aggregate is too long in pre-wetting time, occupies a pre-wetting field, wastes time and reduces the production efficiency are avoided; too short to meet the saturation requirement of the recycled coarse aggregate rich in bricks.
Drawings
FIG. 1 is a water absorption curve of recycled aggregates having a particle size of 5 to 10mm in example 1.
FIG. 2 is a water absorption curve of a recycled aggregate having a particle diameter of 10 to 20mm in example 1.
FIG. 3 is a water absorption curve for the fired shale bricks of the 5-10mm size demolition wall of example 2.
FIG. 4 is a water absorption curve for the fired shale bricks of the 10-20mm particle size demolished wall of example 2.
FIG. 5 is a water absorption curve of clay clinker bricks of a demolished wall of 5 to 10mm particle size in example 3.
FIG. 6 is a water absorption curve of clay clinker bricks of a demolished wall of 10 to 20mm diameter in example 3.
FIG. 7 is a graph showing the water absorption of the clay clinker bricks of the 20-30mm size demolished wall of example 3.
Detailed Description
Description of the drawings: for the concrete for industrial production, the concrete is generally used for products with lower strength, the needed particle size of the coarse aggregate is different, the needed proportion of the particle sizes is different, the grading is different, and the particle size of the aggregate with the particle size of 5-20mm is the common grading of industrial recycled concrete products such as recycled concrete blocks, recycled concrete bricks and the like. The particle size of more than 20mm is too large to be used for producing common recycled concrete products. In the application, the brick-rich recycled coarse aggregate is an aggregate with brick content of more than 90%.
Example 1
(1) Collecting the brick-rich construction waste, and crushing and screening the brick-rich construction waste by Hengji construction materials Limited company in Zhengzhou city;
(2) the aggregate is graded in a laboratory to form 0-5mm, 5-10mm and 10-20mm particle sizes, wherein the particle size of 5-20mm is used as a coarse aggregate, and the particle size below 5mm can be used as a fine aggregate. Washing with water to remove the debris, dust and impurities on the surface of the recycled aggregate, and airing for more than 2 days to achieve an air-dry state;
(3) according to GBT17431.2-1998 part 2 of lightweight aggregate and test method thereof, namely lightweight aggregate test method, the water absorption and water absorption of 5min, 10min, 15min, 20min, 30min, 60min, 120min, 360min, 960min, 1440min and 2880min are respectively obtained;
the recycled aggregate mainly comprises red bricks and concrete, has high water absorption, is subjected to manual screening treatment, has the grading of 0-5mm, 5-10mm and 10-20mm, and has the aggregate characteristics shown in Table 1.
The water absorption rate change with time obtained by the test is shown in tables 2 and 3 according to GBT17431.2-1998 part 2 of lightweight aggregate and test method thereof, lightweight aggregate test method.
(4) Fitting according to the test data as shown in figure 1 and figure 2 to obtain a relational expression of the water absorption capacity and the water absorption time of the recycled aggregate with the particle size of 5-10mm and a relational expression of the water absorption capacity and the water absorption time of the recycled aggregate with the particle size of 10-20mm respectively;
as can be seen from tables 1 and 2, the water absorption capacity of the aggregates with different particle sizes is increased along with the increase of time, the water absorption rate in the first 5 minutes is the maximum, and then the water absorption rate is smooth, and the pore water is basically saturated; the water absorption capacity of the aggregate is in positive correlation with the mass of the aggregate, and can be expressed as follows:in the formula WRCATo absorb Water, SRCAAs water absorption, mRCAFor quality, fitting is carried out according to test data to obtain an aggregate water absorption formula as follows:
the water absorption capacity of the recycled aggregate with the particle size of 5-10mm is as follows:
the water absorption capacity of the recycled aggregate with the particle size of 10-20mm is as follows:
wherein t is soaking time, min, mRCAG is the recycled aggregate mass;
the correlation coefficients of the predicted value and the test value of the formula are 0.968 (aggregate with the particle size of 5-10 mm) and 0.992 (aggregate with the particle size of 10-20 mm), which shows that the formula can be used for predicting the water absorption of the high-water-absorption aggregate.
(5) In order to prepare recycled concrete, mixing 5-10mm of grain size and 10-20mm of grain size according to a ratio of 2:3 to form the required coarse aggregate, wherein the water absorption capacity at the t moment of mixing the aggregate is as follows:
and (3) calculating the saturation of the pore water of the mixed coarse aggregate by using the water absorption formula:
in the formulam RCA(5-10):m RCA(10-20) When the ratio is not less than 2:3, the saturation degree of pore water of the coarse aggregate isPsWhen the content is 96%, the pre-wetting time of the mixed aggregate is determined to be 14 min; selecting the same-gradation coarse aggregate to be prewetted for two days and not to be prewetted respectively as two contrasts for preparing concrete;
(6) the coarse aggregate is pre-wetted according to the determined pre-wetting time, the pre-wetted coarse aggregate passes through the vibrating water-absorbing cloth and is blown by a powerful fan to reach a surface dry state, the coarse aggregate with the pre-wetting time of 14min is prepared into recycled concrete according to the mixing proportion shown in the following table 4 by adopting the traditional process, and the compressive strengths of the coarse aggregate after 3d, 7d and 28d are measured and shown in the table 5. The other two coarse aggregates with pre-wetting time are prepared into concrete according to the following table mixing ratio and the same process, and the compressive strength is shown in table 5.
Note: the fine aggregate contains 243.5kg of regenerated fine aggregate (with the grain diameter of 0-5 mm), the rest is natural sand, the cement is Fengbo Tianrui P.C42-5 composite portland cement produced by Fengbo Tianrui cement company Limited in Henan province, and the water reducing agent uses QS-8020 polycarboxylic acid water reducing agent produced by Shanghai Soft and chemical company Limited, and the dosage is 3 per mill of a cementing material.
As can be seen from the above table, the recycled concrete produced by the same process using air-dried coarse aggregate has a very low compressive strength if the treatment is not prewetted. The longer the pre-wetting time is, the larger the water content of the aggregate is, according to the traditional mixing proportion design method, the less the residual stirring water consumption is, the smaller the free water cement ratio in the actual stirring process is, the more dense the recycled concrete mortar is, so the strength of the recycled concrete produced by soaking the aggregate for 24 hours is higher, but the difference between the additional water amount in the aggregate soaked for 14 minutes is very little, so the strength value of the recycled concrete prepared by pre-wetting the aggregate for 14 minutes is almost the same as that of the recycled concrete prepared by pre-wetting the aggregate for 2 d. But the production time is greatly reduced, which is beneficial to improving the production efficiency.
Example 2
(1) Firing shale bricks from the removed wall, and crushing, screening and grading the shale bricks in a laboratory environment;
(2) washing the graded brick aggregate with water, removing chips, dust and impurities on the surface of the aggregate, and airing for more than 2 days to achieve an air-dry state;
(3) taking aggregate with particle diameter of 5-10mm and 10-20mm, and measuring its apparent density of 926kg/m3Bulk density 515kg/m3. According to GBT17431.2-1998 part 2 of lightweight aggregate and test method thereof, namely lightweight aggregate test method, the water absorption rates of different water absorption times are respectively obtained;
(4) fitting according to the test data in the step (3) to obtain a relational expression between the water absorption capacity of the aggregate and the water absorption time;
the formula of the water absorption capacity of the aggregate with the particle size of 5-10mm is as follows:
the formula of the water absorption capacity of the aggregate with the particle size of 10-20mm is as follows:
the fitted water absorption curves are shown in FIG. 3 and FIG. 4, and the correlation coefficients of the predicted values and the experimental values of the formula are 0.9795 and 0.978, which also indicates that the formula can be used for predicting the water absorption of the high water-absorbing aggregate.
(5) For producing the recycled concrete perforated brick, the coarse aggregate is prepared into mixed aggregate by adopting waste bricks with the particle sizes of 5-10mm and 10-20mm according to the ratio of 1:1, and the saturation of pore water of the mixed coarse aggregate is calculated by using the water absorption formula:
in the formulam RCA(5-10):m RCA(10-20) When 1:1, saturation of pore waterPsWhen the moisture content is 90%, the pre-wetting time of the mixed aggregate is determined to be 1 day;
(6) and pre-wetting the coarse aggregate in mixed gradation according to the determined pre-wetting time, passing the pre-wetted coarse aggregate through a vibrating water absorption cloth, and blowing air through a powerful fan to achieve a surface dry state.
Example 3
(1) Crushing, screening and grading the clay sintered bricks from the removed wall in a laboratory environment;
(2) washing the graded brick aggregate with water, removing chips, dust and impurities on the surface of the aggregate, and airing for more than 2 days to achieve an air-dry state;
(3) the bulk density of the crushed brick body is 840 kg/m3-865kg/m3Taking recycled aggregate with the particle sizes of 5-10mm,10-20mm and 20-30mm, and respectively obtaining water absorption rates with different water absorption times according to GBT17431.2-1998 part 2 of lightweight aggregate and test method thereof, namely lightweight aggregate test method;
(4) fitting according to the test data to obtain a relational expression between the water absorption capacity of the aggregate and the water absorption time;
the formula of the water absorption capacity of the aggregate with the particle size of 5-10mm is as follows:
the formula of the water absorption capacity of the aggregate with the particle size of 10-20mm is as follows:
the formula of the water absorption capacity of the aggregate with the particle size of 20-30mm is as follows:
wherein t is the soaking time, mRCAThe aggregate mass; the fitted water absorption curves are shown in fig. 5-7, and the correlation coefficients of the predicted values and the test values of the formula are both larger than 0.96, which also indicates that the formula can be used for predicting the water absorption of the high water-absorbing aggregate.
(5) For producing the regenerated pervious concrete, the grain diameter is 20-30mm,10-20mm and 5-10mm according to the ratio of 4: preparing the required mixed aggregate according to the proportion of 4:1, and calculating the saturation of the pore water of the aggregate according to the water absorption formula (4):
pre-wetting time for 13min when the saturation degree of pore water is 90%;
(6) and pre-wetting the coarse aggregate in mixed gradation according to the determined pre-wetting time, passing the pre-wetted coarse aggregate through a vibrating water absorption cloth, and blowing air through a powerful fan to achieve a surface dry state.
The invention has the advantages that: the control method is simple and can be used for construction sites, the control method is also suitable for light aggregates such as shale ceramsite and clay ceramsite, and the prepared concrete has high performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.

Claims (7)

1. A control method for the prewetting time of brick-rich recycled coarse aggregate is characterized by comprising the following steps: the method comprises the following steps:
(1) collecting brick-rich construction waste treated in the same batch, wherein the brick-rich recycled coarse aggregate is aggregate with brick content of more than 90%, and crushing, screening and grading the aggregate to obtain recycled coarse aggregate meeting grading requirements;
(2) washing the graded recycled coarse aggregate with water, removing chips, dust and impurities on the surface of the recycled coarse aggregate, and airing for more than 2 days to achieve an air-dry state balanced with the humidity of the surrounding environment;
(3) according to GB/T17431.2-1998 part 2 of lightweight aggregate and test method thereof, namely lightweight aggregate test method, the water absorption and water absorption of the recycled coarse aggregate are respectively obtained for 5min, 10min, 15min, 20min, 30min, 60min, 120min, 360min, 960min, 1440min and 2880 min;
(4) fitting according to the test data to obtain a relational expression of the water absorption capacity and the water absorption time of the recycled coarse aggregate, namely a water absorption capacity formula;
(5) preparing gradation according to the type of the produced product, determining the particle size and the using amount of the needed coarse aggregate, and calculating the pre-wetting time under the saturation required by the recycled coarse aggregate, namely the water absorption time according to the water absorption formula obtained in the step (4);
(6) and pre-wetting the recycled coarse aggregate according to the calculated pre-wetting time, and mechanically blowing the pre-wetted recycled coarse aggregate through the vibrated water absorption cloth to reach a saturated surface dry state.
2. The method for controlling the prewetting time of a brick-rich recycled coarse aggregate according to claim 1, wherein: the step (1) is that the crushed brick-rich construction waste is sieved and classified according to the grain sizes of 0-5mm, 5-10mm,10-20mm, 20-30mm and more than 30 mm.
3. The method for controlling the prewetting time of a brick-rich recycled coarse aggregate according to claim 1, wherein: the saturation in the step (5) is the saturation of pore water of the coarse aggregate:whereinAt maximum water absorption, WRCA(t)The water absorption capacity at t time, Ps is the saturation of pore water of the coarse aggregate.
4. The method for controlling the prewetting time of a brick-rich recycled coarse aggregate according to claim 3, wherein: the relation between the water absorption capacity of the recycled coarse aggregate and the water absorption time is in a logarithmic form.
5. The method for controlling the prewetting time of a brick-rich recycled coarse aggregate according to claim 4, wherein: in the step (4), the formula of the water absorption capacity is as follows:；WRCA(t) is the water absorption capacity at time t; m isRCAThe quality of the recycled coarse aggregate is shown; A. b is an empirical value and is obtained by fitting test data; t is the water absorption time.
6. The method for controlling the prewetting time of a brick-rich recycled coarse aggregate according to claim 1, wherein: the saturation degree required by the recycled coarse aggregate in the step (5) is 90-96%.
7. The method for controlling the prewetting time of a brick-rich recycled coarse aggregate according to claim 1, wherein: the bricks are fired shale bricks, clay sintered bricks, coal gangue bricks and fly ash bricks.
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