Expansion fiber anti-crack waterproof concrete and preparation method thereof

Abstract

The invention relates to expansive fiber anti-crack waterproof concrete, which is prepared from the following components in parts by mass: 880 to 950 parts of sand, 970 to 1020 parts of gravel, 45 to 55 parts of fly ash, 280 to 320 parts of cement, 150 to 170 parts of water, 30 to 40 parts of stone powder, 35 to 50 parts of expansive fiber and 6.6 to 7.8 parts of additives. The preparation method comprises the following steps: pouring 970-1020 parts of broken stone, 880-950 parts of sand, 45-55 parts of fly ash and 280-320 parts of cement into a concrete mixer, uniformly mixing, adding 30-40 parts of stone powder and 35-50 parts of expansion fiber, continuously uniformly mixing, uniformly mixing 6.6-7.8 parts of admixture and 150-170 parts of water, adding into the mixer, and continuously uniformly mixing to obtain the concrete mixture. The concrete is good in impermeability and early-stage crack resistance, and is suitable for underground engineering, large-scale pools and other concrete engineering with high waterproof requirements.

Description

technical field

[0001] The invention relates to the technical field of building material engineering, in particular to a crack-resistant waterproof concrete with expanded fibers and a preparation method thereof. Background technique

[0002] Concrete is the most widely used building material in civil engineering. In most cases, the concrete is restricted by the formwork, steel bars or adjacent parts, and is in a restrained state. The shrinkage of the concrete will cause tensile stress due to the restraint. When the tensile strength and tensile deformation of the concrete are insufficient, cracks will occur, affecting the concrete. Excellent waterproof and anti-seepage performance, especially underground projects, large pools, various building basement projects, etc., are constantly infiltrated by groundwater. If the waterproof and anti-seepage performance of concrete is not good, groundwater will invade underground projects and cause leakage, seriously affecting Normal use ...

Examples

Embodiment 1

[0017] Raw materials: 880 parts of sand, 970 parts of crushed stone, 45 parts of fly ash, 280 parts of cement, 150 parts of water, 30 parts of stone powder, 35 parts of expanded fiber, and 6.6 parts of admixture.

[0018] The expansion fiber in the above raw materials is HF-QF expansion fiber anti-cracking waterproofing agent, which is composed of sulfoaluminate, calcium oxide, calcium carbonate, gypsum, and polypropylene fiber; the sand is machine-made sand with a fineness modulus of 2.8; crushed stone 5mm ~ 26.5mm continuous collection and distribution of crushed stone; the admixture is LZ-J2 polycarboxylate high-performance water reducing agent, the water reducing rate is 25%-27%; the cement is PO42.5 ordinary portland cement; fly ash It is 200 mesh secondary fly ash; the stone powder is limestone powder, the main component is calcium carbonate.

[0019] Process:

[0020] (1) Pour gravel, sand, fly ash, and cement into the concrete mixer in turn, dry mix for 30s~60s and mi...

Embodiment 2

[0027] Raw materials: 950 parts of sand, 1020 parts of crushed stone, 55 parts of fly ash, 320 parts of cement, 170 parts of water, 40 parts of stone powder, 50 parts of expanded fiber, and 7.8 parts of admixture. The composition of every kind of raw material is identical with embodiment 1.

[0028] Technology: with embodiment 1.

[0029] The measured compressive strength of the expanded fiber cracking-resistant waterproof concrete is 40.43MPa, the splitting tensile strength is 3.117MPa, and the impermeability grade is P9.

Embodiment 3

[0031] Raw materials: 915 parts of sand, 991 parts of gravel, 50 parts of fly ash, 297 parts of cement, 34 parts of stone powder, 166 parts of water, 7.2 parts of admixture, and 46 parts of expanded fiber. The composition of every kind of raw material is identical with embodiment 1.

[0032] Technology: with embodiment 1.

[0033] The measured compressive strength of the expanded fiber cracking-resistant waterproof concrete is 39.448MPa, the splitting tensile strength is 3.049MPa, and the impermeability grade is P11.

technical field

[0001] The invention relates to the technical field of building material engineering, in particular to a crack-resistant waterproof concrete with expanded fibers and a preparation method thereof. Background technique

[0002] Concrete is the most widely used building material in civil engineering. In most cases, the concrete is restricted by the formwork, steel bars or adjacent parts, and is in a restrained state. The shrinkage of the concrete will cause tensile stress due to the restraint. When the tensile strength and tensile deformation of the concrete are insufficient, cracks will occur, affecting the concrete. Excellent waterproof and anti-seepage performance, especially underground projects, large pools, various building basement projects, etc., are constantly infiltrated by groundwater. If the waterproof and anti-seepage performance of concrete is not good, groundwater will invade underground projects and cause leakage, seriously affecting Normal use ...

Examples

Embodiment 1

[0017] Raw materials: 880 parts of sand, 970 parts of crushed stone, 45 parts of fly ash, 280 parts of cement, 150 parts of water, 30 parts of stone powder, 35 parts of expanded fiber, and 6.6 parts of admixture.

[0018] The expansion fiber in the above raw materials is HF-QF expansion fiber anti-cracking waterproofing agent, which is composed of sulfoaluminate, calcium oxide, calcium carbonate, gypsum, and polypropylene fiber; the sand is machine-made sand with a fineness modulus of 2.8; crushed stone 5mm ~ 26.5mm continuous collection and distribution of crushed stone; the admixture is LZ-J2 polycarboxylate high-performance water reducing agent, the water reducing rate is 25%-27%; the cement is PO42.5 ordinary portland cement; fly ash It is 200 mesh secondary fly ash; the stone powder is limestone powder, the main component is calcium carbonate.

[0019] Process:

[0020] (1) Pour gravel, sand, fly ash, and cement into the concrete mixer in turn, dry mix for 30s~60s and mi...

Embodiment 2

[0027] Raw materials: 950 parts of sand, 1020 parts of crushed stone, 55 parts of fly ash, 320 parts of cement, 170 parts of water, 40 parts of stone powder, 50 parts of expanded fiber, and 7.8 parts of admixture. The composition of every kind of raw material is identical with embodiment 1.

[0028] Technology: with embodiment 1.

[0029] The measured compressive strength of the expanded fiber cracking-resistant waterproof concrete is 40.43MPa, the splitting tensile strength is 3.117MPa, and the impermeability grade is P9.

Embodiment 3

[0031] Raw materials: 915 parts of sand, 991 parts of gravel, 50 parts of fly ash, 297 parts of cement, 34 parts of stone powder, 166 parts of water, 7.2 parts of admixture, and 46 parts of expanded fiber. The composition of every kind of raw material is identical with embodiment 1.

[0032] Technology: with embodiment 1.

[0033] The measured compressive strength of the expanded fiber cracking-resistant waterproof concrete is 39.448MPa, the splitting tensile strength is 3.049MPa, and the impermeability grade is P11.