Special mortar for micro pile pouring, and preparation method and application thereof

A micro-pile and special technology, applied in the field of micro-pile reinforcement, can solve the problems of the difference in the strength of the upper and lower parts of the pile body and the sinking of sand and gravel, and achieve the effects of small shrinkage, easy pumping, and easy large-scale production.

Inactive Publication Date: 2020-01-03
SHANDONG PROVINCIAL ACAD OF BUILDING RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that the above specification requirements are broad and there are no specific technical standards and technical indicators. In order to increase fluidity, the water-to-cement ratio in specific construction is about 0.6 or even higher, which is likely to cause sand and gravel to sink to the bottom, and the difference in strength between the upper and lower parts of the pile body is serious.

Method used

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preparation example Construction

[0031] In yet another specific embodiment of the present invention, a method for preparing special mortar for pouring micro piles is provided, including:

[0032] Mix the measured ordinary Portland cement, quartz sand, mineral powder or fly ash admixtures and admixtures into a uniform powder;

[0033] Gradually add the above-mentioned uniform powder into the measured water for mechanical stirring.

[0034] In yet another specific embodiment of the present invention, the water-binder ratio is 0.25-0.45, more preferably 0.29-0.41; further including 0.3, 0.35 or 0.4.

[0035] In yet another specific embodiment of the present invention, in mechanical stirring, the linear velocity of the impeller is 0.5-1m / s, and the mortar powder is gradually added, and the feeding time should be controlled at 1.0-1.5min. After the feeding, the linear velocity of the impeller is adjusted to 10m / s. s, start timing, and stir for 5 minutes.

[0036] In yet another specific embodiment of the present...

Embodiment 1

[0041] (1) Preparation of raw materials

[0042] Ordinary Portland cement 100g, mineral powder (S95) 35g, primary fly ash mineral viscosity reducer 20g, polycarboxylate superplasticizer 0.8g, early strength agent 2g, cellulose ether viscosifier 0.6g, plastic expansion Agent 0.15g, defoamer 0.5g, quartz sand 200g.

[0043] (2) According to the above formula, mix it into a powder, and gradually add the above-mentioned uniform powder into the measured water for mechanical stirring. During mechanical stirring, the linear speed of the impeller is 1m / s, and the feeding time is controlled within 1.5min. After the feeding is completed, adjust the linear speed of the stirring impeller to 10m / s, start timing, and stir for 5 minutes.

[0044] The water-binder ratio is 0.30±0.01, the fluidity of the mortar is good, the slurry is stable, it has vertical expansion, the vertical expansion rate is greater than 0.2%, and the 28d strength is greater than 60Mpa.

Embodiment 2

[0046] (1) Preparation of raw materials

[0047] Ordinary Portland cement 100g, mineral powder (S95) 40g, primary fly ash mineral viscosity reducer 25g, polycarboxylate superplasticizer 0.7g, early strength agent 2g, cellulose ether viscosifier 0.6g, plastic expansion Agent 0.2g, defoamer 0.5g, quartz sand (iron tailings) 250g.

[0048] (2) According to the above formula, mix it into a powder, and gradually add the above-mentioned uniform powder into the measured water for mechanical stirring. During mechanical stirring, the linear speed of the impeller is 1m / s, and the feeding time is controlled within 1.5min. After the feeding is completed, adjust the linear speed of the stirring impeller to 10m / s, start timing, and stir for 5 minutes.

[0049] The water-binder ratio is 0.36±0.01, the fluidity of the mortar is good, the slurry is stable, it has vertical expansion, the vertical expansion rate is greater than 0.2%, and the 28d strength is greater than 50Mpa.

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Abstract

The invention relates to special mortar for micro pile pouring, and a preparation method and an application thereof. The special mortar material for micro pile pouring is a mixed powder of ordinary Portland cement, quartz sands, a mineral powder or fly ash admixture and additives, the additives comprise a polycarboxylate superplasticizer, an expanding agent, a plastic expanding agent, a defoamingagent and a tackifier, and the tackifier is one or a combination of more of cellulose ether, polysaccharide, polyacrylamide and flaky silicate. The special mortar has the advantages of stability in the pouring process without layering or bleeding, low viscosity after being mixed, good fluidity, easiness in pumping, low air content, guaranteed strength, small shrinkage amount after being cured, suitableness for pouring micro piles, realization of one-time grouting without mortar supplementation, and guaranteeing of the integrity of the pile body. The mortar is not only suitable for the micro pile pouring, but also suitable for grouting construction of large-slenderness-ratio components such as anchor rods and soil nails and structural reinforcement of damaged concrete components, so the mortar has good practical application values.

Description

technical field [0001] The invention belongs to the technical field of micro-pile reinforcement for foundations, and in particular relates to a special mortar for pouring micro-pile and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Micro piles generally refer to cast-in-situ piles with a pile diameter of less than 300mm and a slenderness ratio of more than 30, which adopt drilling, strong reinforcement and pressure grouting construction techniques. They originated in Italy in the 1950s, and the purpose is to solve the problem of piles under difficult conditions. proposed for construction. In the strengthening of existing house fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/70
CPCC04B28/04C04B2111/00146C04B2111/70C04B2201/50C04B18/141C04B18/08C04B24/383C04B2103/302C04B14/06C04B2103/10C04B2103/50C04B2103/0068
Inventor 陈树林朱俊勋王锦明
Owner SHANDONG PROVINCIAL ACAD OF BUILDING RES
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