CN104276775A - Grading evaluation system of low-quality recycled aggregates - Google Patents
Grading evaluation system of low-quality recycled aggregates Download PDFInfo
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- CN104276775A CN104276775A CN201410323120.5A CN201410323120A CN104276775A CN 104276775 A CN104276775 A CN 104276775A CN 201410323120 A CN201410323120 A CN 201410323120A CN 104276775 A CN104276775 A CN 104276775A
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Abstract
The invention discloses a grading evaluation system of low-quality recycled aggregates. The grading evaluation system comprises the following steps: (1) carrying out grading evaluation on low-quality recycled aggregates; (2) carrying out grading evaluation on ordinary aggregates; (3) carrying out grading evaluation on mixed aggregates, wherein mixed coarse aggregates are composed of low-quality coarse recycled aggregates and ordinary coarse aggregates; the performance indexes of the mixed coarse aggregates meet the requirements as follows: the crushing value index is less than 30%, the sturdiness is less than 12%, and the water absorption of an hour is less than 3%; mixed fine aggregates are composed of low-quality fine recycled aggregates and ordinary fine aggregates; and the performance indexes of the mixed fine aggregates meet the requirements as follows: the compressive strength rate of 28 days is greater than or equal to 85%, the sturdiness is less than 10%, and the saturated-surface-dried moisture retention is less than 5%. When the low-quality brick recycled aggregates of meeting the grading evaluation indexes disclosed by the invention are applied to recycled aggregate concrete, the recycled aggregate concrete has the advantages of high compressive strength, stable performance and the like, and the problem of recycling of the low-quality recycled aggregates can be effectively solved.
Description
Technical field
The present invention relates to a kind of grading evaluation system of low-quality regeneration aggregate, belong to construction refuse resource, the useless field of building materials profit.
Background technology
The quantity of China's building waste has accounted for the 30-40% of municipal wastes total amount according to statistics, through the rough Statistics of the construction material loss to brick mix structure, the full building such as cast-in-place structural and skeleton construction, in the construction process of every ten thousand square metres of buildings, only building waste residue will produce 500-600t.And along with the high speed development of construction industry, make the increasingly soaring of cement and concrete output, the sand and stone resources of many regional high-qualitys is caused to start to occur problem hard to carry on, simultaneously a large amount of exploitation of natural materials and use, also cause the deterioration of soil erosion and natural landscape, have a strong impact on the Sustainable development of society.Therefore, for meeting the requirement of Strategy of Circular Economy, realizing the Sustainable development of concrete industry, in construction work, using regeneration aggregate imperative.
The U.S., Japan and the developed country such as European have born first fruit to the research of regeneration aggregate stage division, and in succession on the basis of test, have promulgated regeneration aggregate quality standard and technical regulation, facilitate the recycling of discarded concrete.But, may be there is larger difference in the cement, natural aggregate, construction technology etc. of country variant, cause the performance gap of discarded concrete comparatively large, therefore, country variant is for the performance evaluation of recycled concrete coarse aggregate, and the particular case should applied according to national concrete is formulated.At present, the grading performance of China's regenerated coarse aggregate evaluates the performance index that Primary Reference GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " specifies, the grading performance of recycled fine aggregate is evaluated the performance that Primary Reference GB/T25176-2010 " concrete and mortar recycled fine aggregate " specifies and referred to.
But, above-mentioned GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " standard is mainly for recycled concrete coarse aggregate, GB/T25176-2010 " concrete and mortar recycled fine aggregate " standard is mainly for regeneration concrete fine aggregate, and the wide material sources of recycled concrete coarse aggregate and regeneration concrete fine aggregate, as derived from the brick regenerated coarse aggregate of brick mix structure containing brick amount higher (being not less than 20%), derive from the Behavior of Hardened Cement Paste regenerated coarse aggregate of concrete structure containing brick amount lower (being less than 20%), and corresponding brick recycled fine aggregate and Behavior of Hardened Cement Paste recycled fine aggregate.For concrete regenerating coarse aggregate and the recycled fine aggregate of above-mentioned different sources, if adopt above-mentioned standard to carry out grading evaluation all respectively, can cause evaluation index can not the performance of effecting reaction regenerated coarse aggregate and recycled fine aggregate, and then when causing adopting this regenerated coarse aggregate and recycled fine aggregate to prepare regenerated aggregate concrete, the performance of regenerated aggregate concrete cannot meet actual architecture production needs.
And the building of China before the seventies is in the majority with brick mix structure, even if skeleton construction, at the regeneration aggregate that dismounting post-treatment is made, some brick components of unavoidably also adulterating.Because brick and concrete apparent density are more or less the same, except adopting the way of manually picking, be difficult at present adopt mechanical system to be separated.If by regeneration aggregate more for brick content, when employing standard GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " and standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " carries out grading evaluation, because in these regeneration aggregates, brick itself has particle weakness, corner angle are more, water-intake rate is high comparatively, these factors reduce the quality of regeneration aggregate, when only adopting standard GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " and standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " to carry out grading evaluation to low-quality regenerated coarse aggregate and low-quality recycled fine aggregate respectively, evaluation result truly cannot reflect the performance of low-quality regenerated coarse aggregate and low-quality recycled fine aggregate, when using it for regenerated aggregate concrete, there is the problem of unstable properties in the regenerated aggregate concrete prepared, actual architecture production needs cannot be met.
Owing to lacking low-quality regeneration aggregate, the grading evaluation of especially low-quality brick recycled aggregate, low-quality Behavior of Hardened Cement Paste regeneration aggregate, therefore result in these to be given it up containing the regeneration aggregate that the quality that brick amount is more is lower, cause building waste and stack everywhere, land occupation.
Summary of the invention
In order to solve the grading evaluation system of not carrying out grading evaluation in prior art for low-quality regenerated coarse aggregate and low-quality recycled fine aggregate, and then provide a kind of grading evaluation system of low-quality regeneration aggregate.
In order to solve the problems of the technologies described above, the invention provides a kind of grading evaluation system of low-quality regeneration aggregate, comprising the steps:
(1) grading evaluation is carried out to low-quality regeneration aggregate:
The method specified according to GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " carries out performance test to low-quality regenerated coarse aggregate, and the method specified according to GB/T25176-2010 " concrete and mortar recycled fine aggregate " carries out performance test to low-quality recycled fine aggregate;
(2) grading evaluation is carried out to general aggregate:
Common coarse aggregate should meet the performance index that GB/T14685-2011 " construction cobble, rubble " specifies, common fine aggregate should meet the performance index that GB/T14684-2011 " construction sand " specifies;
(3) grading evaluation is carried out to combined aggregate:
Mixing coarse aggregate is made up of low-quality regenerated coarse aggregate and common coarse aggregate, and the performance index of described mixing coarse aggregate meet following requirement: crush values index < 30%, and soundness is less than 12%, 1h water-intake rate < 3%; Mixing fine aggregate is made up of low-quality recycled fine aggregate and common fine aggregate, the performance index of described mixing fine aggregate meet following requirement: 28d compressive strength rate >=85%, soundness < 10%, the dry water-intake rate < 5% of saturation plane.
Described low-quality regenerated coarse aggregate is low-quality brick regenerated coarse aggregate or low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate; Low-quality recycled fine aggregate is low-quality brick recycled fine aggregate or low-quality Behavior of Hardened Cement Paste recycled fine aggregate.
When described mixing fine aggregate is made up of low-quality brick recycled fine aggregate and common fine aggregate, low-quality brick recycled fine aggregate accounts for mixing fine aggregate total mass≤20wt%.
When described mixing fine aggregate is made up of low-quality Behavior of Hardened Cement Paste recycled fine aggregate and common fine aggregate, low-quality Behavior of Hardened Cement Paste recycled fine aggregate accounts for mixing fine aggregate total mass≤40wt%.
When described mixing coarse aggregate is made up of low-quality brick regenerated coarse aggregate and common coarse aggregate, low-quality brick regenerated coarse aggregate accounts for mixing coarse aggregate total mass≤40wt%.
When described mixing coarse aggregate is made up of low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate and common coarse aggregate, low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate accounts for mixing coarse aggregate total mass≤60wt%.
Described low-quality brick regenerated coarse aggregate derives from brick mix structure, wherein containing brick amount >=20wt%, particle diameter 5mm ~ 25mm.
Described low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate derives from concrete structure, wherein containing brick amount < 20wt%, particle diameter 5mm ~ 25mm.
Described low-quality brick recycled fine aggregate derives from brick mix structure, wherein containing brick amount >=20wt%, particle diameter 80 μm ~ 5mm.
Described low-quality Behavior of Hardened Cement Paste recycled fine aggregate derives from concrete structure, wherein containing brick amount < 20wt%, particle diameter 80 μm ~ 5mm.
The present invention compared with prior art tool has the following advantages:
(1) the grading evaluation system of low-quality regeneration aggregate of the present invention, first the method specified according to GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " carries out performance test to low-quality regenerated coarse aggregate, and the method specified according to GB/T25176-2010 " concrete and mortar recycled fine aggregate " carries out performance test to low-quality recycled fine aggregate; Known by the test result in the embodiment of the present invention, the water-intake rate of low-quality brick regenerated coarse aggregate does not meet the lowest performance level of regenerated coarse aggregate, and other index all reaches the technical requirements of the reinforcement of concrete III class regenerated coarse aggregate, inferior quality; Low-quality brick recycled fine aggregate is except the requirement that clod content and voidage can reach the reinforcement of concrete II class recycled fine aggregate, other index can only reach the technical requirements of III class recycled fine aggregate, and reclaimed rubber sand compressive strength rate index does not even meet lowest limit requirement, inferior quality; Generally according to GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " and GB/T25176-2010 " concrete and mortar recycled fine aggregate " regulation, such regeneration is thick, fine aggregate is the preparation that can not be used for regenerated aggregate concrete.And the present invention is utilized by Efficient Cycle to enable low-quality brick recycled fine aggregate and low-quality brick regenerated coarse aggregate, the present invention specifies to make the mixing fine aggregate containing low-quality brick recycled fine aggregate meet crush values index < 30% further, soundness is less than 12%, 1h water-intake rate < 3%; The mixing coarse aggregate containing low-quality brick regenerated coarse aggregate is made to meet 28d compressive strength rate >=85%, soundness < 10%, the dry water-intake rate < 5% of saturation plane, the low-quality regeneration brick fine aggregate and the low-quality regeneration brick coarse aggregate that meet above-mentioned requirements like this rationally can be applied and quality control in ready mixed concrete.Test result is passable by experiment, and when the low-quality brick recycled aggregate meeting grading evaluation index of the present invention is for the preparation of regenerated aggregate concrete, regenerated aggregate concrete has that ultimate compression strength is high, steady performance.By the grading evaluation system of low-quality regeneration aggregate of the present invention, can make at present with low-quality regeneration aggregate in the majority, mix as the combined aggregate part in concrete, be the most direct approach of abundant absorption and digestion building waste, effectively can solve the recycling problem of low-quality regeneration aggregate.
(2) the grading evaluation system of low-quality regeneration aggregate of the present invention, be not only applicable to the grading evaluation of low-quality brick recycled aggregate, also can be used for the grading evaluation of low-quality Behavior of Hardened Cement Paste regeneration aggregate, test result is passable by experiment, adopt the grading evaluation system of low-quality regeneration aggregate of the present invention, after grading evaluation is carried out to low-quality Behavior of Hardened Cement Paste regeneration aggregate, when the low-quality Behavior of Hardened Cement Paste regeneration aggregate meeting grading evaluation condition is for the preparation of regenerated aggregate concrete, regenerated aggregate concrete has that ultimate compression strength is high, steady performance.
Embodiment
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
Raw materials usedly in following embodiment to refer in particular to as non-, be commercially available prod.
In following embodiment, low-quality brick regenerated coarse aggregate used is mainly derived from brick mix structure, wherein containing brick amount >=20wt%, particle diameter 5mm ~ 25mm;
Low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate is mainly derived from concrete structure, wherein containing brick amount < 20wt%, particle diameter 5mm ~ 25mm;
Low-quality brick recycled fine aggregate is mainly derived from brick mix structure, wherein containing brick amount >=20wt%, particle diameter 80 μm ~ 5mm;
Low-quality Behavior of Hardened Cement Paste recycled fine aggregate is mainly derived from concrete structure, wherein containing brick amount < 20wt%, particle diameter 80 μm ~ 5mm;
Common coarse aggregate is stone, 5-25mm continuous grading, silt content≤1.0%, clod content≤0.5%, elongated particles≤8.0%, place of production Miyun Region of Beijing;
Common fine aggregate is normal sands, and fineness modulus is 2.6 ~ 2.9, silt content≤3.0%, clod content≤1.0%, place of production Miyun Region of Beijing,
embodiment 1
The grading evaluation system of low-quality regeneration aggregate described in the present embodiment, comprises the steps:
(1) grading evaluation is carried out to low-quality regeneration aggregate:
Choose low-quality brick regenerated coarse aggregate, the method specified according to standard GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " carries out performance measurement, the results are shown in Table 1.
The physical performance index of the low-quality brick regenerated coarse aggregate of table 1
The low-quality regenerated coarse aggregate processed by useless brick is not except water-intake rate meets the lowest performance level of regenerated coarse aggregate, and other index all reaches the technical requirements of the reinforcement of concrete III class regenerated coarse aggregate, inferior quality.
Choose low-quality brick recycled fine aggregate, the method specified according to standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " carries out performance measurement, the results are shown in Table 2;
The physical performance index of the low-quality brick recycled fine aggregate of table 2
The low-quality recycled fine aggregate processed by refuse clay brick is except the requirement that clod content and voidage can reach the reinforcement of concrete II class recycled fine aggregate, other index can only reach the technical requirements of III class recycled fine aggregate, and reclaimed rubber sand compressive strength rate index does not even meet lowest limit requirement, inferior quality.
(2) grading evaluation is carried out to general aggregate:
Common coarse aggregate should meet the performance index that GB/T14685-2011 " construction cobble, rubble " specifies, common fine aggregate should meet the performance index that GB/T14684-2011 " construction sand " specifies, common coarse aggregate is 5mm ~ 25mm continuous grading rubble, common fine aggregate is II district's medium sand, and partial properties index the results are shown in Table 3 and table 4.
The performance index of the common coarse aggregate of table 3
| Silt content (%) | Clod content (wt%) | Flat-elongated particles content (wt%) | Apparent density (kg/m 3) |
| 0.3 | 0.2 | 3 | 2600 |
The performance index of the common fine aggregate of table 4
| Fineness modulus | Content of stone powder (%) | Clod content (wt%) | Apparent density (kg/m 3) |
| 2.7 | 2.5 | 0.3 | 2650 |
(3) grading evaluation is carried out to combined aggregate:
By low-quality regenerated coarse aggregate and stone, low-quality recycled fine aggregate and normal sands are arranged in pairs or groups respectively by a certain percentage, obtain mixing coarse aggregate and mixing fine aggregate, wherein, in the present embodiment, low-quality regenerated coarse aggregate selects low-quality brick regenerated coarse aggregate, low-quality recycled fine aggregate selects low-quality brick recycled fine aggregate, respectively according to the prescriptive procedure of GB/T14685-2011 " building with cobble, rubble " and GB/T14684-2011 " construction sand ", measure the crush index of mixing coarse aggregate and mixing fine aggregate, testing program and the results are shown in Table 5, table 6.
Table 5 low-quality brick regenerated coarse aggregate and common coarse aggregate collocation after crush index
Table 6 low-quality brick recycled fine aggregate and common fine aggregate collocation after crush index
Crush index reflects the ability of aggregate opposing physics mechanical failure.Can find from table 5, table 6, test-results, after low-quality brick recycled fine aggregate mixes with normal sands according to the above ratio, single-stage crush index and total crush index are all less than 25%, meet the crush index requirement to II class sand in GB/T14684-2011 " construction sand "; After low-quality brick regenerated coarse aggregate mixes with common coarse aggregate according to the above ratio, its crush index, all lower than 20%, meets the technical requirements to II class rubble in GB/T14685-2011 " construction cobble, rubble ".
No matter be low-quality recycled fine aggregate or low-quality regenerated coarse aggregate, with the increase replacing general aggregate ratio, crush index is increasing gradually, and illustrate that in regeneration aggregate, soft particle is more, quality will lower than general aggregate.
The present invention is further to above-mentioned mixing fine aggregate, and the method specified according to GB/T14684-2011 " construction sand " is carried out the dry water-intake rate of 28d compressive strength rate, soundness and saturation plane and carried out performance test, and test result is as shown in table 7:
Table 7 low-quality brick mixing fine aggregate 28d compressive strength rate and the dry water-intake rate test result of saturation plane
As shown in Table 7, after replacing common fine aggregate with the low-quality brick recycled fine aggregate of different ratios, degree of mobilization keeps identical substantially; Along with low-quality brick recycled fine aggregate substitution amount increases, the 28d cement mortar strength of mixing fine aggregate then has a declining tendency, and when 20wt% substitute proportion, it is 7.6% that intensity reduces amplitude, and when 40wt% substitute proportion, intensity reduces amplitude and reaches 17.8%.
Common fine aggregate is replaced in the ratio of 40wt% to by low-quality brick recycled fine aggregate, low-quality brick regenerated coarse aggregate replaces common coarse aggregate in the ratio of 60wt%, the method specified by GB/T14684-2011 " construction sand " and GB/T14685-2011 " construction cobble, rubble " respectively carries out tough test, the results are shown in Table 8 and table 9.
The low-quality brick recycled fine aggregate of table 8 replaces the soundness of the mixed sand of normal sands in the ratio of 40wt%
The low-quality brick regenerated coarse aggregate of table 9 replaces the soundness of the mixing coarse aggregate of stone in the ratio of 60wt%
As shown in Table 8, low-quality brick recycled fine aggregate replaces by the ratio of 40wt% the soundness index of mixed sand that normal sands obtains and is discontented with the requirement that mixing fine aggregate soundness of the present invention is less than 10%; As shown in Table 9, the mixing coarse aggregate that low-quality brick regenerated coarse aggregate obtains after replacing stone mixing in the ratio of 60wt% does not reach the regulation of mixing coarse aggregate soundness≤12% of the present invention yet.
For this reason, need the substitute proportion suitably lowering low-quality brick regenerated coarse aggregate and low-quality brick recycled fine aggregate, namely the substitute proportion of low-quality brick recycled fine aggregate is adjusted to 20wt%, the substitute proportion of low-quality brick regenerated coarse aggregate is adjusted to 40wt%, mend the soundness surveying combined aggregate again, the total mass loss rate of mixing fine aggregate and mixing coarse aggregate is respectively 9% and 11%, and result meets the soundness requirement of combined aggregate of the present invention substantially.
After above-mentioned low-quality regeneration aggregate grading evaluation, draw, when preparing low-quality brick recycled aggregate concrete, the mixing fine aggregate that fine aggregate can be selected low-quality brick recycled fine aggregate to account for mixing fine aggregate total mass to be 20wt% to the maximum, the mixing coarse aggregate that coarse aggregate can be selected low-quality brick regenerated coarse aggregate to account for mixing coarse aggregate total mass to be 40wt% to the maximum.
Further, present invention also offers and adopt the mixing fine aggregate meeting above-mentioned low-quality regeneration aggregate grading evaluation criteria to prepare regenerated aggregate concrete with mixing coarse aggregate, in every cubic metre of regenerated aggregate concrete, be made up of following raw material: cement 197kg, mixing fine aggregate 859kg, mixing coarse aggregate 908kg, polycarboxylate water-reducer 7.6kg, water-cement ratio 0.57, additional water 42kg, wherein mix low-quality brick recycled fine aggregate in fine aggregate and account for the 20wt% of mixing fine aggregate total mass, in mixing coarse aggregate, low-quality brick regenerated coarse aggregate accounts for the 40wt% of mixing coarse aggregate total mass.Carry out performance test to the regenerated aggregate concrete prepared, result is as shown in table 10:
Table 10 regenerated aggregate concrete performance
As shown in Table 10, low-quality brick recycled fine aggregate in mixing fine aggregate is adopted to account for the 20wt% of mixing fine aggregate total mass, in mixing coarse aggregate, low-quality brick regenerated coarse aggregate accounts for the 40wt% of mixing coarse aggregate total mass, the concrete prepared meets the actual use properties requirement of concrete, illustrate and adopt the classification evaluation method of low-quality regeneration aggregate of the present invention effectively can carry out grading evaluation to low-quality regeneration aggregate, evaluation index can meet concrete Essential Performance Requirements.
embodiment 2
The grading evaluation system of low-quality regeneration aggregate described in the present embodiment, comprises the steps:
(1) grading evaluation is carried out to low-quality regeneration aggregate:
Choose low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate, the method specified according to standard GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " carries out performance measurement, the results are shown in Table 11.
The physical performance index of the low-quality Behavior of Hardened Cement Paste coarse aggregate of table 11
The regenerated coarse aggregate processed by Behavior of Hardened Cement Paste is except powder content meets III class performance rate, and other index reaches the technical requirements of I class the reinforcement of concrete regenerated coarse aggregate, and quality is relatively better.
Choose low-quality Behavior of Hardened Cement Paste recycled fine aggregate, the method specified according to standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " carries out performance measurement, the results are shown in Table 12.
The physical performance index of the low-quality Behavior of Hardened Cement Paste fine aggregate of table 12
The recycled fine aggregate processed by Behavior of Hardened Cement Paste is except reclaimed rubber sand compressive strength rate meets III class performance rate, and other index reaches the technical requirements of II class and above the reinforcement of concrete recycled fine aggregate, and quality is relatively better.
(2) grading evaluation is carried out to general aggregate:
Common coarse aggregate should meet the performance index that GB/T14685-2011 " construction cobble, rubble " specifies, common fine aggregate should meet the performance index that GB/T14684-2011 " construction sand " specifies, common coarse aggregate is 5mm ~ 25mm continuous grading rubble, common fine aggregate is II district's medium sand, and partial properties index the results are shown in Table 13 and table 14.
The performance index of the common coarse aggregate of table 13
The performance index of the common fine aggregate of table 14
| Fineness modulus | Content of stone powder (%) | Clod content (%) | Apparent density (kg/m 3) |
| 2.7 | 2.5 | 0.3 | 2650 |
(3) grading evaluation is carried out to combined aggregate:
By low-quality regenerated coarse aggregate and general aggregate, low-quality recycled fine aggregate and normal sands are arranged in pairs or groups respectively by a certain percentage, obtain mixing coarse aggregate and mixing fine aggregate, wherein, in the present embodiment, low-quality regenerated coarse aggregate selects low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate, low-quality recycled fine aggregate selects low-quality Behavior of Hardened Cement Paste recycled fine aggregate, measures the crush index of mixing coarse aggregate and mixing fine aggregate respectively, testing program and the results are shown in Table 15,16.
Table 15 low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate and common coarse aggregate collocation after crush index
Table 16 low-quality Behavior of Hardened Cement Paste recycled fine aggregate and common fine aggregate collocation after crush index
Crush index reflects the ability of aggregate opposing physics mechanical failure.Can find from table 15, table 16, test-results, after mixing with normal sands according to the above ratio, Behavior of Hardened Cement Paste recycled fine aggregate single-stage crush index and total crush index are all less than 25%, meet the crush index requirement to II class sand in GB/T14684-2011; After Behavior of Hardened Cement Paste regenerated coarse aggregate mixes with common coarse aggregate according to the above ratio, its crush index, all lower than 20%, meets the technical requirements to II class rubble in GB/T14685.
No matter be low-quality Behavior of Hardened Cement Paste recycled fine aggregate or low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate, with the increase replacing general aggregate ratio, crush index is increasing gradually, and illustrate that in regeneration aggregate, soft particle is more, quality will lower than general aggregate.
The present invention carries out the dry water-intake rate of 28d compressive strength rate, soundness and saturation plane to above-mentioned mixing fine aggregate further and carries out performance test, and test result is shown in table 17:
Table 17 low-quality Behavior of Hardened Cement Paste combined aggregate 28d compressive strength rate and the dry water-intake rate test result of saturation plane
As shown in Table 17, after replacing common fine aggregate with the low-quality Behavior of Hardened Cement Paste recycled fine aggregate of different ratios, degree of mobilization keeps identical substantially; Behavior of Hardened Cement Paste recycled fine aggregate and the mixed 28d cement mortar strength of normal sands substantially with normal sands maintain an equal level.
Common fine aggregate is replaced in the ratio of 40wt% to by low-quality Behavior of Hardened Cement Paste recycled fine aggregate, low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate replaces common coarse aggregate in the ratio of 60wt%, the method specified by GB/T14684-2011 " construction sand " and GB/T14685-2011 " construction cobble, rubble " respectively carries out tough test, the results are shown in Table 18 and table 19.
The low-quality Behavior of Hardened Cement Paste recycled fine aggregate of table 18 replaces the soundness of the mixed sand of normal sands in the ratio of 40wt%
The low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate of table 19 replaces the soundness of the cement gravel of stone in the ratio of 60wt%
As shown in Table 18, low-quality Behavior of Hardened Cement Paste recycled fine aggregate and normal sands according to the above ratio mixed soundness index are≤6%, meet the regulation that mixing fine aggregate soundness of the present invention is less than the requirement of 10%; As shown in Table 19, after low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate and common coarse aggregate mix according to the above ratio, soundness is 8%, meets the regulation of mixing coarse aggregate soundness≤12% of the present invention.
After above-mentioned low-quality regeneration aggregate grading evaluation, draw, when preparing low-quality brick recycled aggregate concrete, the mixing fine aggregate that fine aggregate can be selected low-quality Behavior of Hardened Cement Paste recycled fine aggregate to account for mixing fine aggregate total mass to be 40wt% to the maximum, the mixing coarse aggregate that coarse aggregate can be selected low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate to account for mixing coarse aggregate total mass to be 60wt% to the maximum.
Further, present invention also offers and adopt the mixing fine aggregate meeting above-mentioned low-quality regeneration aggregate grading evaluation criteria to prepare regenerated aggregate concrete with mixing coarse aggregate, in every cubic metre of regenerated aggregate concrete, be made up of following raw material: ordinary Portland cement P.O42.5285kg, mixing fine aggregate 852kg, mixing coarse aggregate 941kg, polycarboxylate water-reducer 9.5kg, water-cement ratio 0.40, additional water 18kg, wherein mix low-quality Behavior of Hardened Cement Paste recycled fine aggregate in fine aggregate and account for the 40wt% of mixing fine aggregate total mass, in mixing coarse aggregate, low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate accounts for the 60wt% of mixing coarse aggregate total mass.Carry out performance test to the regenerated aggregate concrete prepared, result is shown in table 20:
Table 20 regenerated aggregate concrete performance
As shown in Table 20, low-quality brick recycled fine aggregate in mixing fine aggregate is adopted to account for the 40wt% of mixing fine aggregate total mass, in mixing coarse aggregate, low-quality brick regenerated coarse aggregate accounts for the 60wt% of mixing coarse aggregate total mass, the concrete prepared meets the actual use properties requirement of concrete, illustrate and adopt the classification evaluation method of low-quality regeneration aggregate of the present invention effectively can carry out grading evaluation to low-quality regeneration aggregate, evaluation index can meet concrete Essential Performance Requirements.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments, and thus the apparent change of extending out or variation be still among the protection domain of the claims in the present invention.
Claims (10)
1. a grading evaluation system for low-quality regeneration aggregate, comprises the steps:
(1) grading evaluation is carried out to low-quality regeneration aggregate:
The method specified according to GB/T25177-2010 " the reinforcement of concrete regenerated coarse aggregate " carries out performance test to low-quality regenerated coarse aggregate, and the method specified according to GB/T25176-2010 " concrete and mortar recycled fine aggregate " carries out performance test to low-quality recycled fine aggregate;
(2) grading evaluation is carried out to general aggregate:
Common coarse aggregate should meet the performance index that GB/T14685-2011 " construction cobble, rubble " specifies, common fine aggregate should meet the performance index that GB/T14684-2011 " construction sand " specifies;
(3) grading evaluation is carried out to combined aggregate:
Mixing coarse aggregate is made up of low-quality regenerated coarse aggregate and common coarse aggregate, and the performance index of described mixing coarse aggregate meet following requirement: crush values index < 30%, and soundness is less than 12%, 1h water-intake rate < 3%; Mixing fine aggregate is made up of low-quality recycled fine aggregate and common fine aggregate, the performance index of described mixing fine aggregate meet following requirement: 28d compressive strength rate >=85%, soundness < 10%, the dry water-intake rate < 5% of saturation plane.
2. the grading evaluation system of low-quality regeneration aggregate according to claim 1, it is characterized in that, described low-quality regenerated coarse aggregate is low-quality brick regenerated coarse aggregate or low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate; Low-quality recycled fine aggregate is low-quality brick recycled fine aggregate or low-quality Behavior of Hardened Cement Paste recycled fine aggregate.
3. the grading evaluation system of low-quality regeneration aggregate according to claim 2, is characterized in that, when described mixing fine aggregate is made up of low-quality brick recycled fine aggregate and common fine aggregate, low-quality brick recycled fine aggregate accounts for mixing fine aggregate total mass≤20wt%.
4. the grading evaluation system of low-quality regeneration aggregate according to claim 2, it is characterized in that, when described mixing fine aggregate is made up of low-quality Behavior of Hardened Cement Paste recycled fine aggregate and common fine aggregate, low-quality Behavior of Hardened Cement Paste recycled fine aggregate accounts for mixing fine aggregate total mass≤40wt%.
5. the grading evaluation system of low-quality regeneration aggregate according to Claims 2 or 3 or 4, it is characterized in that, when described mixing coarse aggregate is made up of low-quality brick regenerated coarse aggregate and common coarse aggregate, low-quality brick regenerated coarse aggregate accounts for mixing coarse aggregate total mass≤40wt%.
6. the grading evaluation system of low-quality regeneration aggregate according to Claims 2 or 3 or 4, it is characterized in that, when described mixing coarse aggregate is made up of low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate and common coarse aggregate, low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate accounts for mixing coarse aggregate total mass≤60wt%.
7. the grading evaluation system of low-quality regeneration aggregate according to claim 2 or 5, it is characterized in that, described low-quality brick regenerated coarse aggregate derives from brick mix structure, wherein containing brick amount >=20wt%, particle diameter 5mm ~ 25mm.
8. the grading evaluation system of low-quality regeneration aggregate according to claim 2 or 6, it is characterized in that, described low-quality Behavior of Hardened Cement Paste regenerated coarse aggregate derives from concrete structure, wherein containing brick amount < 20wt%, particle diameter 5mm ~ 25mm.
9. the grading evaluation system of low-quality regeneration aggregate according to Claims 2 or 3, it is characterized in that, described low-quality brick recycled fine aggregate derives from brick mix structure, wherein containing brick amount >=20wt%, particle diameter 80 μm ~ 5mm.
10. the grading evaluation system of low-quality regeneration aggregate according to claim 2 or 4, it is characterized in that, described low-quality Behavior of Hardened Cement Paste recycled fine aggregate derives from concrete structure, wherein containing brick amount < 20wt%, particle diameter 80 μm ~ 5mm.
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| CN114195436A (en) * | 2021-11-15 | 2022-03-18 | 北京建工资源循环利用投资有限公司 | Recycled concrete replaced by brick-concrete recycled fine aggregate and preparation method thereof |
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