Oyster shell powder desalted sea sand AC-20 asphalt mixture and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to an oyster shell powder desalted sea sand AC-20 asphalt mixture and a preparation method thereof. The oyster shell powder desalted sea sand AC-20 asphalt mixture is prepared from, by mass, 3.0%-3.8% of oyster shell powder; 3.7%-4.3% of asphalt; 23.8%-26.6% of desalted sea sand; 6.4%-9.3% of 4 # broken stone (3-6mm); 15.2%-18.4% of 3 # broken stone (6-11mm); 17.9%-20.5% of 2 # broken stone (11-16 mm); and 25.1%-29.6% of 1 # broken stone (16-22 mm). The oyster shell powder desalted sea sand AC-20 asphalt mixture prepared by the method is a novel building material and has the characteristics of convenience in material taking, energy conservation and environmental protection; a large amount of oystershell powder and sea sand are utilized, the problems of environmental protection and land occupation of oyster shells can be solved, increasingly scarce river sand resources are relieved, the application range of the oyster shells and the sea sand is expanded, various pavement performance indexes of the asphalt mixture meet specification requirements, the cost of used materials is low, and the material cost of the AC-20 asphalt mixture can be reduced; and wide application prospects are realized.

Description

technical field

[0001] The invention belongs to the technical field of building materials, and in particular relates to an AC-20 asphalt mixture desalinated with oyster shell powder and a preparation method thereof. Background technique

[0002] Sand is also called concrete fine aggregate, which is a necessary material for construction projects; salvaging river sand for construction aggregate production is a traditional method in my country. River sand often contains more mud and needs to be washed and dried for dry powder Mortar; as my country's economy continues to take off today, the demand for sand and gravel aggregates is naturally increasing; river sand can no longer meet the construction requirements of my country's rapid development. Every year, my country's infrastructure construction requires hundreds of billions of tons of sand, resulting in the phenomenon of "green mountains hanging white and rivers turning yellow", which seriously affects the ecological environme...

Examples

Embodiment 1

[0031] A preparation method of oyster shell powder desalinated sea sand AC-20 asphalt mixture, at first, produce desalinated sea sand according to the following process:

[0032] Collect the purchased sea sand; wash, dry, and pass through a 4.75mm sieve to obtain the desalinated sea sand in the required particle size range; the gross volume relative density of the desalinated sea sand is 2.685g / cm 3 The obtained sea sand is shown in Table 2 by the mass percent of the following sieve holes.

[0033]

[0034] Then, adopt the oyster shell powder listed in table 3, wherein the gross volume relative density of oyster shell powder is 2.708g / cm 3 . Described oyster shell powder is the discarded oyster shell (its CaO content ≥ 96.9%, Na 2 O content ≥ 0.56%), obtained by jaw crusher crushing, drying, planetary brand ball mill grinding, and passing through a 0.15mm sieve.

[0035]

[0036] The asphalt used is 50#A grade road asphalt, with a penetration of 53 (0.1mm), a softening ...

Embodiment 2

[0040] The performance of each raw material used in embodiment 2 is consistent with that described in embodiment 1, and the difference between embodiment 2 and embodiment 1 is: the present embodiment according to the mass percentage ratio: oyster shell powder: desalinated sea sand: 4# Crushed stone: 3# crushed stone: 2# crushed stone: 1# crushed stone is 3.8%: 26.6%: 6.4%: 15.2%: 18.6%: 25.1%. Mix these raw material components evenly and heat To 175°C, a mixed material was obtained.

[0041] In order to verify the road performance of the prepared oyster shell powder desalinated sea sand AC-20 asphalt mixture, the optimal asphalt ratio was determined by Marshall compaction test, and the prepared oyster shell powder desalinated sea sand AC-20 was added to the mixture prepared above. -20 asphalt mixture with 4.3% mass and 50#A grade road asphalt at a temperature of 165°C was mixed to prepare oyster shell powder desalinated sea sand AC-20 asphalt mixture, and the road performance ...

Embodiment 3

[0043] The performance of each raw material used in embodiment 3 is consistent with that described in embodiment 1, and the difference between embodiment 3 and embodiment 1 is: the present embodiment according to the mass percentage ratio: oyster shell powder: desalinated sea sand: 4# Crushed stone: 3# crushed stone: 2# crushed stone: 1# crushed stone is 3.0%: 23.8%: 6.4%: 15.2%: 19.5%: 28.4%. Mix these raw material components evenly and heat To 175°C, a mixed material was obtained.

[0044] In order to verify the road performance of the prepared oyster shell powder desalinated sea sand AC-20 asphalt mixture, the optimal asphalt content (3.7%) determined by the Marshall compaction test, the prepared oyster shell was added to the above prepared mixture Oyster shell powder desalinated sea sand AC-20 asphalt mixture was mixed with 50#A grade road asphalt with a mass of 3.7% and a temperature of 165°C to obtain an AC-20 asphalt mixture desalinated with oyster shell powder, and the...

technical field

[0001] The invention belongs to the technical field of building materials, and in particular relates to an AC-20 asphalt mixture desalinated with oyster shell powder and a preparation method thereof. Background technique

[0002] Sand is also called concrete fine aggregate, which is a necessary material for construction projects; salvaging river sand for construction aggregate production is a traditional method in my country. River sand often contains more mud and needs to be washed and dried for dry powder Mortar; as my country's economy continues to take off today, the demand for sand and gravel aggregates is naturally increasing; river sand can no longer meet the construction requirements of my country's rapid development. Every year, my country's infrastructure construction requires hundreds of billions of tons of sand, resulting in the phenomenon of "green mountains hanging white and rivers turning yellow", which seriously affects the ecological environme...

Examples

Embodiment 1

[0031] A preparation method of oyster shell powder desalinated sea sand AC-20 asphalt mixture, at first, produce desalinated sea sand according to the following process:

[0032] Collect the purchased sea sand; wash, dry, and pass through a 4.75mm sieve to obtain the desalinated sea sand in the required particle size range; the gross volume relative density of the desalinated sea sand is 2.685g / cm 3 The obtained sea sand is shown in Table 2 by the mass percent of the following sieve holes.

[0033]

[0034] Then, adopt the oyster shell powder listed in table 3, wherein the gross volume relative density of oyster shell powder is 2.708g / cm 3 . Described oyster shell powder is the discarded oyster shell (its CaO content ≥ 96.9%, Na 2 O content ≥ 0.56%), obtained by jaw crusher crushing, drying, planetary brand ball mill grinding, and passing through a 0.15mm sieve.

[0035]

[0036] The asphalt used is 50#A grade road asphalt, with a penetration of 53 (0.1mm), a softening ...

Embodiment 2

[0040] The performance of each raw material used in embodiment 2 is consistent with that described in embodiment 1, and the difference between embodiment 2 and embodiment 1 is: the present embodiment according to the mass percentage ratio: oyster shell powder: desalinated sea sand: 4# Crushed stone: 3# crushed stone: 2# crushed stone: 1# crushed stone is 3.8%: 26.6%: 6.4%: 15.2%: 18.6%: 25.1%. Mix these raw material components evenly and heat To 175°C, a mixed material was obtained.

[0041] In order to verify the road performance of the prepared oyster shell powder desalinated sea sand AC-20 asphalt mixture, the optimal asphalt ratio was determined by Marshall compaction test, and the prepared oyster shell powder desalinated sea sand AC-20 was added to the mixture prepared above. -20 asphalt mixture with 4.3% mass and 50#A grade road asphalt at a temperature of 165°C was mixed to prepare oyster shell powder desalinated sea sand AC-20 asphalt mixture, and the road performance ...

Embodiment 3

[0043] The performance of each raw material used in embodiment 3 is consistent with that described in embodiment 1, and the difference between embodiment 3 and embodiment 1 is: the present embodiment according to the mass percentage ratio: oyster shell powder: desalinated sea sand: 4# Crushed stone: 3# crushed stone: 2# crushed stone: 1# crushed stone is 3.0%: 23.8%: 6.4%: 15.2%: 19.5%: 28.4%. Mix these raw material components evenly and heat To 175°C, a mixed material was obtained.

[0044] In order to verify the road performance of the prepared oyster shell powder desalinated sea sand AC-20 asphalt mixture, the optimal asphalt content (3.7%) determined by the Marshall compaction test, the prepared oyster shell was added to the above prepared mixture Oyster shell powder desalinated sea sand AC-20 asphalt mixture was mixed with 50#A grade road asphalt with a mass of 3.7% and a temperature of 165°C to obtain an AC-20 asphalt mixture desalinated with oyster shell powder, and the...

Images