Pervious concrete for sponge city pavement and preparation method

Abstract

The invention relates to the technical field of building materials, and provides pervious concrete for a sponge city pavement and a preparation method. The pervious concrete is prepared by mixing heatshrinkable particles, cement, coarse aggregate, fly ash, a water reducing agent, a tackifier and water, wherein the heat shrinkable particles are prepared by coating a heat-shrinkable polymer with acoupling agent. When the pervious concrete is used as the sponge city pavement, the pervious concrete has high strength in winter with low requirements on pervious capacity, and has high strength andhigh water permeability in summer with high requirements on pervious capacity.

Description

technical field

[0001] The invention belongs to the technical field of building materials, and provides a permeable concrete for sponge city pavement and a preparation method thereof. Background technique

[0002] With the development of urban construction, more and more sites and roads are covered by concrete. Due to the compactness of concrete, the circulation and circulation of air, water, and moisture between the ground and the soil are blocked. When it rains, it is difficult for rainwater to seep into the soil. Once there is a heavy rainstorm, urban waterlogging will occur. During drought, the amount of precipitation is small, and the water in the soil cannot evaporate into the air, resulting in low air humidity and high temperature, causing the urban heat island effect. Therefore, it is necessary to vigorously develop sponge cities, and permeable concrete has become a sponge city pavement material with great development potential due to its good water permeability an...

Examples

Embodiment 1

[0026] Coarse aggregate is crushed stone with a particle size of 5-10mm; the water reducer is calcium lignosulfonate; the tackifier is carboxymethyl cellulose; the heat shrinkable polymer is cross-linked heat shrinkable polyethylene, and its Tg after testing is 20°C; the coupling agent is silane coupling agent kh550; the cement is ordinary Portland cement 42.5;

[0027] The mass ratio of heat-shrinkable particles, cement, coarse aggregate, fly ash, water reducer, tackifier, and water is 15:26:100:11:1.3:0.7:33;

[0028] The mass ratio of the coupling agent in the heat-shrinkable particles to the heat-shrinkable polymer is 4:100;

[0029] Preparation steps:

[0030] (1) Crush the heat-shrinkable polymer in a plastic crusher until the particle size is not greater than 3mm, then add it to a high-speed mixer, add a coupling agent, heat to 80°C, stir and mix at a speed of 500r / min for 20min, stop Stir and cool naturally to room temperature to obtain heat-shrinkable particles;

...

Embodiment 2

[0033] The coarse aggregate is pebbles with a particle size of 5~10mm; the water reducer is sodium lignosulfonate; the tackifier is hydroxypropyl methylcellulose; the heat shrinkable polymer is heat shrinkable polyurethane, and its Tg is 22°C after testing ; The coupling agent is silane coupling agent kh570; the cement is ordinary Portland cement 42.5;

[0034] The mass ratio of heat shrinkable particles, cement, coarse aggregate, fly ash, water reducing agent, tackifier, and water is 20:28:100:13:1:0.8:30;

[0035] The mass ratio of the coupling agent in the heat-shrinkable particles to the heat-shrinkable polymer is 3:100;

[0036] Preparation steps:

[0037] (1) Crush the heat-shrinkable polymer in a plastic crusher until the particle size is not greater than 3mm, then add it to a high-speed mixer, add a coupling agent, heat to 90°C, stir and mix at a speed of 300r / min for 20min, stop Stir and cool naturally to room temperature to obtain heat-shrinkable particles;

[003...

Embodiment 3

[0040] The coarse aggregate is pebbles with a particle size of 5~10mm; the water reducing agent is magnesium lignosulfonate; the tackifier is hydroxypropyl methylcellulose; Its Tg is 24°C; the coupling agent is silane coupling agent kh570; the cement is ordinary Portland cement 42.5;

[0041] The mass ratio of heat-shrinkable particles, cement, coarse aggregate, fly ash, water reducer, tackifier, and water is 16:30:100:10:1.2:0.7:35;

[0042] The mass ratio of the coupling agent in the heat-shrinkable particles to the heat-shrinkable polymer is 3:100;

[0043] Preparation steps:

[0044] (1) Crush the heat-shrinkable polymer in a plastic crusher until the particle size is not greater than 3mm, then add it to a high-speed mixer, add a coupling agent, heat to 85°C, stir and mix at a speed of 400r / min for 30min, stop Stir and cool naturally to room temperature to obtain heat-shrinkable particles;

[0045](2) First add heat-shrinkable particles, coarse aggregate, and half of wa...

technical field

[0001] The invention belongs to the technical field of building materials, and provides a permeable concrete for sponge city pavement and a preparation method thereof. Background technique

[0002] With the development of urban construction, more and more sites and roads are covered by concrete. Due to the compactness of concrete, the circulation and circulation of air, water, and moisture between the ground and the soil are blocked. When it rains, it is difficult for rainwater to seep into the soil. Once there is a heavy rainstorm, urban waterlogging will occur. During drought, the amount of precipitation is small, and the water in the soil cannot evaporate into the air, resulting in low air humidity and high temperature, causing the urban heat island effect. Therefore, it is necessary to vigorously develop sponge cities, and permeable concrete has become a sponge city pavement material with great development potential due to its good water permeability an...

Examples

Embodiment 1

[0026] Coarse aggregate is crushed stone with a particle size of 5-10mm; the water reducer is calcium lignosulfonate; the tackifier is carboxymethyl cellulose; the heat shrinkable polymer is cross-linked heat shrinkable polyethylene, and its Tg after testing is 20°C; the coupling agent is silane coupling agent kh550; the cement is ordinary Portland cement 42.5;

[0027] The mass ratio of heat-shrinkable particles, cement, coarse aggregate, fly ash, water reducer, tackifier, and water is 15:26:100:11:1.3:0.7:33;

[0028] The mass ratio of the coupling agent in the heat-shrinkable particles to the heat-shrinkable polymer is 4:100;

[0029] Preparation steps:

[0030] (1) Crush the heat-shrinkable polymer in a plastic crusher until the particle size is not greater than 3mm, then add it to a high-speed mixer, add a coupling agent, heat to 80°C, stir and mix at a speed of 500r / min for 20min, stop Stir and cool naturally to room temperature to obtain heat-shrinkable particles;

...

Embodiment 2

[0033] The coarse aggregate is pebbles with a particle size of 5~10mm; the water reducer is sodium lignosulfonate; the tackifier is hydroxypropyl methylcellulose; the heat shrinkable polymer is heat shrinkable polyurethane, and its Tg is 22°C after testing ; The coupling agent is silane coupling agent kh570; the cement is ordinary Portland cement 42.5;

[0034] The mass ratio of heat shrinkable particles, cement, coarse aggregate, fly ash, water reducing agent, tackifier, and water is 20:28:100:13:1:0.8:30;

[0035] The mass ratio of the coupling agent in the heat-shrinkable particles to the heat-shrinkable polymer is 3:100;

[0036] Preparation steps:

[0037] (1) Crush the heat-shrinkable polymer in a plastic crusher until the particle size is not greater than 3mm, then add it to a high-speed mixer, add a coupling agent, heat to 90°C, stir and mix at a speed of 300r / min for 20min, stop Stir and cool naturally to room temperature to obtain heat-shrinkable particles;

[003...

Embodiment 3

[0040] The coarse aggregate is pebbles with a particle size of 5~10mm; the water reducing agent is magnesium lignosulfonate; the tackifier is hydroxypropyl methylcellulose; Its Tg is 24°C; the coupling agent is silane coupling agent kh570; the cement is ordinary Portland cement 42.5;

[0041] The mass ratio of heat-shrinkable particles, cement, coarse aggregate, fly ash, water reducer, tackifier, and water is 16:30:100:10:1.2:0.7:35;

[0042] The mass ratio of the coupling agent in the heat-shrinkable particles to the heat-shrinkable polymer is 3:100;

[0043] Preparation steps:

[0044] (1) Crush the heat-shrinkable polymer in a plastic crusher until the particle size is not greater than 3mm, then add it to a high-speed mixer, add a coupling agent, heat to 85°C, stir and mix at a speed of 400r / min for 30min, stop Stir and cool naturally to room temperature to obtain heat-shrinkable particles;

[0045](2) First add heat-shrinkable particles, coarse aggregate, and half of wa...

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