CN101186471B - Concrete - Google Patents

Abstract

The invention discloses a concrete. The amount of every material in every cubic meter of t concrete is: 390-450 kg of cement, 695-730 kg of sand, 1035-1050 kg of stones, 190-200 kg of water, 60-70 kg of pulverized fuel ash, 50-60 kg of UEA concrete expansion agent, 6.5-7.35 kg of SP403 pumping agent and 0.6-0.7 kg of gerres fiber. The slump of the invention is 12-16 cm. The concrete not only has the advantages of workability, plasticity and pumpability, but also effectively prevents the concretes of super-length concrete structure from being cracked easily.

Description

A kind of concrete

Technical field

The present invention relates to the concrete that uses in a kind of construction work.

Background technology

In the construction work at present, the crack of concrete structure is comparatively general, concrete shrinks in knot hard process, can expand with heat and contract with cold during temperature variation, after these two kinds of distortion suffer restraints, will produce string stress in inside configuration causes concrete cracking and forms shrinkage crack, along with building to maximizing and multi-functional development, overlength (promptly surpassing the Temperature Joint spacing) high level or large column net building constantly occur, the raising of strength grade of concrete, the application of pump concrete technology in the construction, the temperature shrinkage crack that Overlong Concrete Structure is prone to has the trend that increases gradually, influences durability of structures and globality.The C40 concrete that adopts in general Overlong Concrete Structure proportioning commonly used such as following table:

The above-mentioned concrete that is configured to ftractures easily.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of concrete, can solve the easy rimose problem of concrete in the present Overlong Concrete Structure.

In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of concrete, each material usage in every cubic meter of concrete: cement 390～450kg, sand 695～730kg, stone 1035～1050kg, water 190～200kg, flyash 60～70kg, UEA cement expansive material 50～60kg, SP403 pumping agent 6.5～7.35kg, Gray's Si fiber 0.6～0.7kg.

The present invention is 12～16cm owing to having adopted technique scheme, the slump, concrete workability, but plasticity-and pumping are effective, can effectively prevent the easy rimose problem of concrete in the Overlong Concrete Structure simultaneously.

Embodiment

The admixture that uses in the concrete of the present invention: the UEA cement expansive material can be offset the shrinkage that forms in the course of hardening, thereby reduces desciccation crack, improves concrete cracking resistance and anti-permeability performance; The SP403 pumping agent can make pumpability good to the concrete lubricate; Gray's Si fiber can play the anticracking effect to concrete.The concrete that following examples are configured to, ultimate compression strength meets the demands, the axial tensile strength standard value also can meet the demands, and can effectively prevent the cracking phenomena in the Overlong Concrete Structure, at 48 meters span prestressed concrete crossbeams (cross section 1.1m * 5.5m) in the application cracking phenomena does not take place.

Embodiment one:

Each material usage in every cubic meter of concrete of design strength grade C40: with the AEC expansive cement 420kg of strength grade 42.5MPa, medium sand 728kg, fineness degree 5～25mm rubble 1047kg and the dry mixing of 65kg flyash are even, add UEA cement expansive material 56kg again, SP403 pumping agent 6.9kg, Gray's Si fiber 0.6kg stirs, and adds entry 190kg at last and stirs.

As following table 1 is the compressive strength test record of the embodiment of the invention one:

Table 1

Embodiment two:

Each material usage in every cubic meter of concrete of design strength grade C40: with the AEC expansive cement 390kg of strength grade 42.5MPa, medium sand 721kg, fineness degree 5～25mm rubble 1038kg and the dry mixing of 70kg flyash are even, add UEA cement expansive material 60kg again, SP403 pumping agent 7.14kg, Gray's Si fiber 0.7kg stirs, and adds entry 195kg at last and stirs.

As following table 2 are compressive strength test records of the embodiment of the invention two:

Table 2

Embodiment three:

Each material usage in every cubic meter of concrete of design strength grade C40: with the AEC expansive cement 450kg of strength grade 42.5MPa, medium sand 698kg, fineness degree 5～25mm rubble 1047kg and the dry mixing of 65kg flyash are even, add UEA cement expansive material 60kg again, SP403 pumping agent 7.35kg, Gray's Si fiber 0.6kg stirs, and adds entry 190kg at last and stirs.

As following table 3 are compressive strength test records of the embodiment of the invention three:

Table 3

Claims (1)

1. concrete, each material usage is as follows in every cubic meter of concrete: cement 390～450kg, sand 695～730kg, stone 1035～1050kg, water 190～200kg, flyash 60～70kg, UEA cement expansive material 50～60kg, SP403 pumping agent 6.5～7.35kg, Gray's Si fiber 0.6～0.7kg.