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Cement for cast-in-place piles and preparation method thereof

A cast-in-place pile and cement technology, applied in the field of cement, can solve the problems of low density, poor sulfate corrosion resistance, large hydration heat, etc., and achieve the effects of delaying setting time, enhancing compressive effect, and simple and easy preparation method.

Inactive Publication Date: 2020-08-11
山东永正水泥有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used is general-purpose Portland cement. The disadvantages of general-purpose Portland cement are as follows: large heat of hydration, poor resistance to sulfate corrosion, poor impermeability, and low compactness.

Method used

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  • Cement for cast-in-place piles and preparation method thereof
  • Cement for cast-in-place piles and preparation method thereof
  • Cement for cast-in-place piles and preparation method thereof

Examples

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preparation example Construction

[0067] Preferably, the preparation method of the ultra-fine ash comprises: mixing and grinding the ash, fly ash and by-product sodium sulfate;

[0068] Preferably, the grinding time is 10 to 20 minutes;

[0069] Preferably, the specific surface area of ​​the ultrafine ash is 480-520m 2 / kg.

[0070] The method has simple process, is suitable for mass production, and has low production cost.

[0071] Crushing equipment includes vertical mills. The vertical mill is an equipment integrating crushing, drying, grinding and grading conveying, with high production efficiency and low drying cost.

[0072] The invention controls the water content of the ash and slag raw materials and the fly ash raw material, and cooperates with the by-product Yuanming powder to ensure the water content at 10% to 15%, further reducing subsequent drying costs and saving energy.

[0073] The water demand ratio of the superfine ash is 95-96%, and the loss on ignition is 3%-4%.

[0074] Preferably, th...

Embodiment 1

[0086] A cement for cast-in-situ piles, comprising the following components in parts by weight:

[0087] 48 parts of cement clinker, 4.5 parts of desulfurized gypsum, 15 parts of superfine ash and 30 parts of composite slag powder;

[0088] The composite slag micropowder includes the following components in mass percentage: 80% slag, 19.1% ceramic waste and 0.9% by-product Yuanming powder;

[0089] The ultra-fine ash is mainly prepared from the following raw materials in mass percentage: 73% of ash, 26% of fly ash and 1% of by-product sodium sulfate;

[0090] The ash comprises the following components in mass percentage: SiO 2 50.5%, Al 2 o 3 336.55%, Fe 2 o 3 5.57%, CaO 4.19%, MgO 1%, SO 3 0.02%; loss on ignition is 2.80%, moisture content is 9.2%;

[0091] Described fly ash comprises the component of following mass percent: SiO 2 55.89%, Al 2 o 3 27.68%, Fe 2 o 3 5.35%, CaO 3.51%, MgO 0.85%, SO 3 0.31%; loss on ignition is 2.50%, water content is 2.7%;

...

Embodiment 2

[0096] A cement for cast-in-situ piles, comprising the following components in parts by weight:

[0097] 50 parts of cement clinker, 4 parts of desulfurized gypsum, 16 parts of superfine ash and 27 parts of composite slag powder;

[0098] The composite slag micropowder includes the following components in mass percentage: 78% of slag, 21% of ceramic waste and 1% of by-product slag powder;

[0099] The ultra-fine ash is mainly prepared from the following raw materials in mass percentage: 70% of ash, 29% of fly ash and 1% of by-product sodium sulfate.

[0100] Described superfine ash raw material component is with embodiment 1;

[0101] The preparation method of the cement for the cast-in-place pile comprises the following steps:

[0102] Mix and grind cement clinker, desulfurized gypsum and superfine ash until the specific surface area of ​​the powder is 340-400m 2 / kg, then add the composite slag powder and mix evenly, and the time of the grinding is 15min.

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Abstract

The invention relates to the technical field of cement, in particular to cement for cast-in-place piles and a preparation method of the cement. The cement for the cast-in-place pile comprises the following components in parts by weight: 40-60 parts of cement clinker, 3-6 parts of desulfurized gypsum, 12-18 parts of superfine ash and 25-35 parts of composite slag micro powder, wherein the compositeslag micro powder comprises the following components in percentage by mass; 75%-85% of slag, 13.5%-24.5% of ceramic waste and 0.5%-1.5% of byproduct anhydrous sodium sulphate; the superfine ash is mainly prepared from the following raw materials in percentage by mass: 65%-80% of ash residues, 18.8%-34.2% of fly ash and 0.8%-1.2% of byproduct anhydrous sodium sulphate. The cement for the cast-in-place piles has excellent breaking strength and compressive strength, and is good in anti-permeability effect and excellent in chemical corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to cement for pouring piles and a preparation method thereof. Background technique [0002] Cast-in-place pile is a kind of pile made by forming holes in place and pouring concrete or reinforced concrete. Cast-in-situ piles can be divided into bored piles, sinking-pipe piles, manual-dug piles, and explosive-expanded piles according to their different hole-forming methods. The current cast-in-situ pile project has higher requirements on the strength, chemical corrosion resistance, impermeability and corrosion resistance of the cementitious material. At present, the most widely used is general-purpose Portland cement. The disadvantages of general-purpose Portland cement are as follows: large heat of hydration, poor resistance to sulfate corrosion, poor impermeability, and low compactness. [0003] In view of this, the present invention is proposed. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/28C04B7/28C04B7/26C04B7/24C04B7/147
CPCC04B7/147C04B7/24C04B7/26C04B7/28C04B11/28Y02P40/10
Inventor 窦霆张青青
Owner 山东永正水泥有限公司
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