Addition for concrete of road for enhacing anti-bending strength

A concrete admixture and flexural strength technology, which is applied in the field of building materials, can solve the problems of high compressive strength margin, difficulty in achieving flexural strength, and increasing the amount of cement, so as to improve the gel phase structure of cement stone and reduce the amount of cement Dosage, the effect of improving early strength

Inactive Publication Date: 2005-01-05
TONGJI UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the inherent characteristics of cement concrete materials when preparing pavement concrete, that is, when the compressive strength meets the requirements, the flexural strength is difficult to reach 4.5MPa. In order to meet the requirements of flexural strength, designers and builders have to increase The amount of cement is used, which brings new problems such as too much compressive strength (up to 20MPa or more), increased cost, large shrinkage rate, and serious shrinkage and cracking, which restricts the enthusiasm of design units to use cement concrete in pavement design.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, improve flexural strength type road concrete admixture by naphthalenesulfonic acid formaldehyde condensate 18.4% (mass percentage, the same below), calcium lignosulfonate 6.4%, sugar calcium 1.5%, sodium sulfate 36.8%, sulfurous acid It is formulated with 7.5% iron, 14.7% calcium nitrite and 14.7% fly ash. Adding 2.0% of the admixture to the concrete, which accounts for 2.0% of the weight of the cement, can be used in 42.5 grade ordinary Portland cement with a dosage of 330kg / m 3 In the case of a slump of 3-5cm, the concrete with a flexural strength of more than 5.0MPa and a compressive strength of about 43MPa is prepared. When using the traditional method (that is, without the admixture), it is necessary to make the flexural strength When the strength reaches 4.5MPa, the amount of cement is generally 420kg / m 3 above, and the drying shrinkage rate is as high as 540×10 -6 .

Embodiment 2

[0026] Embodiment 2, improve flexural strength type road concrete admixture by naphthalene sulfonic acid formaldehyde condensate 14.9%, calcium lignosulfonate 3.7%, sugar calcium 2.2%, calcium sulfate 41.8%, ferrous sulfate 7.6%, calcium nitrite 14.9% and fly ash 14.9% formulated. Adding this admixture in concrete, which accounts for 2.5% of the weight of cement, can make the dosage of 32.5 ordinary Portland cement only 360kg / m 3 In the case of a slump of 3-5cm, the concrete with a flexural strength of more than 5.5MPa and a compressive strength of about 45MPa is prepared. When using the traditional method (that is, without the admixture), it is necessary to make the flexural strength When the strength reaches 4.5MPa, the amount of cement is generally 450kg / m 3 above.

Embodiment 3

[0027] Embodiment 3, improve flexural strength type road concrete admixture by naphthalenesulfonic acid formaldehyde condensate 20.2%, calcium lignosulfonate 1.6%, sugar calcium 1.0%, calcium sulfate 32%, ferrous sulfate 2.2%, calcium nitrite 20% and fly ash 23% prepared. Adding this admixture in concrete, which accounts for 4.5% of the weight of cement, can use only 350kg / m of 32.5 ordinary Portland cement 3 In the case of a slump of 3-5cm, the concrete with a flexural strength of more than 5.5MPa and a compressive strength of about 46MPa is prepared. When using the traditional method (that is, without the admixture), the flexural strength must be made When the strength reaches 4.5MPa, the amount of cement is generally 450kg / m 3 above.

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Abstract

The invention relates to a road concrete additive of improving folding strength, prepared of benzene solfonic acid formaldehyde condensation compound, lignin calcium sulfonate, sugar calcium, sodium calcium sulphate, ferrous sulphate, calcium nitrite and powder coal ashes. It can reduce the water dosage of concrete by above 18%, enhances the early strength of concrete by a large margin and increase the 28 d pressive strength, obviously enhance the folding strength of concrete, thus on condition of less dosage of cement, able to make the folding strength of concrete up to the requirements for above secondary roads (folding strength above 4.5 MPa), and simultaneously able to improve the durability of concrete. It can be widely applied to road concrete and simultaneously applied to the constructions (structures) of reinforced concrete, precast concrete, steam cured concrete, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a road concrete admixture for improving flexural strength. Background technique [0002] At present, my country's municipal construction and the construction of various infrastructures are in full swing, and my country's pavement materials mainly use asphalt concrete and cement concrete. Cement concrete pavement is generally recognized due to its advantages of high strength, excellent durability, good overall stability, and color that is conducive to traffic at night. However, due to the inherent characteristics of cement concrete materials when preparing pavement concrete, that is, when the compressive strength meets the requirements, the flexural strength is difficult to reach 4.5MPa. In order to meet the requirements of flexural strength, designers and builders have to increase The amount of cement is used, which brings new problems such as too much compressive str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B22/08C04B22/14C04B24/18C04B24/22C04B24/38
CPCY02W30/91
Inventor 孙振平蒋正武张冠伦王玉吉
Owner TONGJI UNIV
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