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A kind of modified coffee grounds, its preparation method and a kind of pervious concrete using the same

A technology of permeable concrete and coffee grounds, applied in the field of building materials, can solve the problems of high cost, achieve low cost, reduce the risk of heavy metal pollution, and have good adsorption performance

Active Publication Date: 2022-08-02
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN110128076A A kind of C20 permeable concrete with high efficiency for air purification and its preparation method, by adding an adsorbent composed of nano-titanium dioxide, activated carbon carbon fiber, modified diatomaceous earth, moss powder and TPU resin to the permeable concrete, mainly for automobile exhaust Adsorption and purification, and the cost is relatively high

Method used

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  • A kind of modified coffee grounds, its preparation method and a kind of pervious concrete using the same
  • A kind of modified coffee grounds, its preparation method and a kind of pervious concrete using the same
  • A kind of modified coffee grounds, its preparation method and a kind of pervious concrete using the same

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preparation example Construction

[0028] (1) Preparation of modified coffee grounds:

[0029] 50 g of coffee grounds were pretreated with 0.01 mol / L KOH alkaline solution for 60 min, and then washed with deionized water until neutral. Then, it was added to 1L of a mixed solution of 200g / L NaOH and 30g / L cetyltrimethylammonium bromide for reaction, and the reaction was carried out at 250rpm in a magnetic stirrer for 2h to increase the adsorption sites on the surface of coffee grounds. The drained solids were washed with deionized water until neutral, dried and passed through a 40 mesh screen.

[0030] Infrared spectroscopy analysis of untreated coffee grounds and modified coffee grounds yielded the following results: figure 1 shown. Compared with the untreated coffee grounds, the modified coffee grounds have the following groups: -OH (3424.03 cm -1 ), carboxyl group, ester group or aldehyde group C=O (1773.88cm -1 and 1638.45cm -1 ), C-O of ester group (1020.69cm-1), C-H of aromatic ring (901.34cm-1, 834.2...

Embodiment 1

[0033] Using the jarring standard vibrating screen machine developed by the Building Materials Institute of China Academy of Building Research, model: ZBSX 92A, vibration frequency: 221min, swing stroke: 25mm, jarring frequency: 147min, motor power: 0.37Kw. According to the sieve size (mm)>20 (22.2%), 16-20 (28.8%), 10 (40%), <5 (9%) coarse aggregate gradation standard, screen 980g of crushed stone.

[0034] Wet the contact equipment such as mixers and tools with water, and then mix the modified coffee grounds (17.5g), ordinary Portland cement (332.5g) with a label of P.O42.5, polyvinyl acetate (52.5g) and polycarboxylate Pour the acid-based superplasticizer (17.5g) into the mixer and stir evenly, then add water (105g), stir for 3-5 minutes, then add crushed stone (980g) and industrial sand (420g) to the mixer, and continue to stir until uniform.

[0035] The obtained mixed slurry was poured into a 100mm×100mm×100mm mold, and pressurized by a press to a molding pressure of 3M...

Embodiment 2

[0037] Using the jarring standard vibrating screen machine developed by the Building Materials Institute of China Academy of Building Research, model: ZBSX 92A, vibration frequency: 221min, swing stroke: 25mm, jarring frequency: 147min, motor power: 0.37Kw. According to the sieve size (mm)>20 (22.2%), 16-20 (28.8%), 10 (40%), <5 (9%) coarse aggregate gradation standard, screen 980g of crushed stone.

[0038] Wet the contact equipment such as mixers and tools with water, and then mix modified coffee grounds (35g), slag Portland cement (315g) with the label P.S 42.5, polyoxyethylene (52.5g) and sulfonic acid-based water reducing agent (17.5g) g) Pour it into the mixer and stir evenly, then add water (105g), stir for 3-5 minutes, then add crushed stone (980g) and industrial sand (420g) into the mixer, and continue to stir until uniform.

[0039] The obtained mixed slurry was poured into a 100mm×100mm×100mm mold, and pressurized by a press to a molding pressure of 3MPa. Steam cur...

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Abstract

The invention discloses modified coffee grounds, a preparation method thereof and a permeable concrete using the same. In the present invention, the modified coffee grounds are obtained by pretreating the coffee grounds with an alkaline solution to neutrality, adding a mixed aqueous solution of NaOH and cetyltrimethylammonium bromide to react, and then draining the modified coffee grounds. A permeable concrete is prepared by mixing with cement, water, coarse aggregate, fine aggregate, gelling agent and water reducing agent. The invention can reduce the risk of heavy metal pollution by using the modified coffee grounds to improve the heavy metal adsorption capacity of the permeable concrete. The invention uses the modified coffee grounds to prepare the permeable concrete with low cost, easy acquisition, good adsorption performance, and little influence on the strength of the permeable concrete. In addition, the present invention can efficiently utilize solid waste, which can improve economic benefit and reduce pollution.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a modified coffee grounds, a preparation method thereof and a permeable concrete using the same. Background technique [0002] Pervious concrete is a porous lightweight concrete made of coarse aggregate, cement and water. When the permeable concrete floor is used, the surface water can flow into the ground, effectively protect the groundwater, alleviate the urban heat island effect, and promote the circulation of surface water. However, due to the burning of a large amount of automobile fuel, oil leakage, random disposal of electronic waste, and pollution from factories and garbage dumps in the city, when the surface water is discharged into the sewage pipeline network through the ground structure, there are still many heavy metal pollutants enriched, which are harmful to the surrounding cities. The soil causes certain heavy metal pollution, which in turn causes environmental d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/24C04B28/04C04B28/08C04B38/08C04B111/40
CPCY02W30/91
Inventor 梁云超储洪强徐宁何泓航曾有旭秦昭巧蒋林华
Owner HOHAI UNIV
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