Method for producing C40 concrete

A production method and technology for concrete, applied in the field of concrete, can solve the problems of reducing the control and durability of concrete cracks, difficult to ensure the performance requirements of self-consolidating concrete workability, increasing shrinkage value, etc., to reduce insufficient hydration, Improved crack control and durability, improved workability

Inactive Publication Date: 2020-02-14
海南华盛混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation process of C40 self-compacting concrete with higher strength, it is easy to increase the shrinkage value due to the high amount of cementitious material required, which reduces the crack control and durability of concrete; although existing Choose to add admixtures to compensate for shrinkage, but it is difficult to ensure the performance requirements of workability of self-consolidating concrete

Method used

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  • Method for producing C40 concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1-a kind of production method of C40 concrete, comprises the steps:

[0035] (1) Raw material formula

[0036] By weight, the preparation of concrete per cubic meter includes the following weight raw materials: 230Kg of cement, 95g of fly ash, 160kg of water, 830kg of sand, 935kg of bluestone, 120kg of mineral powder, 8kg of composite water reducing agent and 12kg of mixed fiber;

[0037] The composite water reducer, by mass percentage, includes: polycarboxylate water reducer 13%, aliphatic water reducer 5%, reinforcing agent 1%, expansion agent 0.5%, anti-settling agent 0.3%, defoamer 0.02% and the balance is water; the mixed fiber is a mixture of alumina fine powder, short carbon fiber, polyethylene long fiber and coconut shell fiber, and the weight ratio is 1:1:1:2; short carbon fiber is 5-8mm, polyethylene The long fiber is 25-30mm, the coconut shell fiber is 10-15mm; the particle size of the alumina fine powder is 0.25-0.55mm; %6mm~10mm, 35%11mm~15mm, ...

Embodiment 2

[0043] Example 2 - a production method of C40 concrete, the difference from Example 1 is that the raw material formula is: cement 240Kg, fly ash 105g, water 170kg, sand 840kg, bluestone 955kg, mineral powder 130kg, composite water reducer 10kg and mixed fiber 18kg;

[0044]The composite water reducer includes, by mass percentage: 13-15% polycarboxylate water reducer, 6% aliphatic water reducer, 5% reinforcing agent, 1.0% expansion agent, 0.5% anti-settling agent, defoamer 0.04% and the balance is water; the mixed fiber is a mixture of alumina fine powder, short carbon fiber, polyethylene long fiber and coconut shell fiber, and the weight ratio is 1:2:2:2; the short carbon fiber is 5-8mm, The polyethylene long fiber is 25-30mm, the coconut shell fiber is 10-15mm; the particle size of the alumina fine powder is 0.25-0.55mm; the bluestone is crushed until the particle size gradation is: 5% 3-5mm , 35% 6mm ~ 10mm, 35% 11mm ~ 15mm, 15% 16mm ~ 20mm, 10% 21 ~ 25mm;

[0045] The ant...

Embodiment 3

[0047] Embodiment 3-a production method of C40 concrete, the difference from Example 1 is that the raw material formula is: cement 235Kg, fly ash 100g, water 165kg, sand 835kg, bluestone 940kg, mineral powder 125kg, composite water reducer 9.5 kg and mixed fiber 15.5kg;

[0048] The composite water reducer, by mass percentage, includes: polycarboxylate water reducer 14%, aliphatic water reducer 5.5%, reinforcing agent 3%, expansion agent 0.65%, anti-settling agent 0.4%, defoamer 0.03% and the balance is water; the mixed fiber is a mixture of alumina fine powder, short carbon fiber, polyethylene long fiber and coconut shell fiber, and the weight ratio is 1:3:3:2; short carbon fiber is 5-8mm, polyethylene The long fiber is 25-30mm, the coconut shell fiber is 10-15mm; the particle size of the alumina fine powder is 0.25-0.55mm; %6mm~10mm, 35%11mm~15mm, 15%16mm~20mm, 10%21~25mm;

[0049] The anti-sedimentation agent is cellulose ether CMC; the label of the cement is 425#; the fl...

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Abstract

The invention provides a method for producing C40 concrete. The method comprises the following steps: (1) preparing the following raw materials in parts by weight for each cubic meter of concrete: 230-240Kg of cement, 95-105g of coal ash, 160-170kg of water, 830-840kg of sand, 935-955kg of bluestone, 120-130kg of mineral powder, 8-10kg of a composite water reducing agent and 12-18kg of a mixed fiber, wherein the composite water reducing agent comprises a polycarboxylate superplasticizer, an aliphatic water reducing agent, a reinforcing agent, an expanding agent, an anti-sinking agent, a defoaming agent and water; the mixed fiber is a mixture of aluminum oxide fine powder, short carbon fiber, polyethylene long fiber and coconut shell fiber, and the bluestone is crushed for certain size grading; (2) preparing the composite water reducing agent; and (3) adding the coal ash and the mineral powder into an upright stirrer, performing stirring, adding bluestone, sand and cement, performing stirring at a speed of 90-105r / min, adding the mixed fiber, performing stirring at a speed of 230-260r / min, adding the composite water reducing agent and water, performing stirring at a speed of 130-150r / min firstly, and further performing stirring at a speed of 160-180r / min, so as to obtain the C40 concrete. The C40 self-compacted concrete produced by using the production method which is provided by the invention and is used for producing the C40 concrete takes both good compensation shrinkage and peaceability into account.

Description

technical field [0001] The invention relates to concrete technology, in particular to a production method of C40 concrete. Background technique [0002] Self-compacting concrete is a kind of concrete that can flow and compact under its own gravity without external force, and can evenly fill the entire model without additional vibration. Therefore, in the casting process, it needs to meet the requirements of greater fluidity, better stability and excellent filling properties. [0003] The powder material used in existing self-compacting concrete to fill the gaps formed when aggregates are piled up is usually a cementitious material slurry formed by cement and fly ash. However, in the preparation process of C40 self-compacting concrete with higher strength, it is easy to increase the shrinkage value due to the high amount of cementitious material required, which reduces the crack control and durability of concrete; although existing The addition of admixtures is chosen to co...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50C04B18/08C04B14/06C04B14/043C04B18/12C04B2103/302C04B2103/0068C04B2103/50C04B14/303C04B14/386C04B16/0625C04B18/265C04B12/04C04B22/148
Inventor 刘兴刘兴平周飞
Owner 海南华盛混凝土有限公司
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