CN102910851B

CN102910851B - Q-phase aluminate cement expanding agent and preparation method thereof

Info

Publication number: CN102910851B
Application number: CN201210403578.2A
Authority: CN
Inventors: 姜奉华
Original assignee: University of Jinan
Current assignee: University of Jinan
Priority date: 2012-10-22
Filing date: 2012-10-22
Publication date: 2014-04-16
Anticipated expiration: 2032-10-22
Also published as: CN102910851A

Abstract

The invention relates to a Q-phase aluminate cement expanding agent and a preparation method thereof, which belong to the technical field of additives of cement and concrete materials. The Q-phase aluminate cement expanding agent consists of 60-40 percent of Q-phase cement clinker and 40-60 percent of industrial dihydrate gypsum, wherein the Q-phase cement clinker contains 80-99.9 percent of Q-phase aluminate minerals. Compared with concrete prepared by using the conventional expanding agent (a sulfoaluminate expanding agent taking ettringite as an expanding source), concrete prepared by using the Q-phase aluminate cement expanding agent has the advantages that: the free swell ratio at middle and later periods is increased remarkably; in particular, the free swell ratio is much higher than that of the conventional expanding agent 30 days later; and later-period contraction of concrete can be compensated.

Description

A kind of Q phase aluminate cement swelling agent and preparation method thereof

Technical field

The present invention relates to a kind of Q phase aluminate cement swelling agent and preparation method thereof, belong to the admixture technical field of cement and concrete material.

Background technology

Expansive agent for cement slurry is a kind of chemical admixture, is added in cement, and when cement setting hardens, volumetric expansion thereupon, plays compensate for shrinkage and tension reinforcing steel bar and produce prestress and abundant filling concrete gap.At present, though traditional sulplo-aluminate class swelling agent take ettringite as expansion sources has the fast advantage of hydration rate, but its expansion mainly occurs in before 7 d, exists and is difficult to shortcomings such as the contraction of cement-based material middle and later periods compensate.

Summary of the invention

In order to solve the existing sulplo-aluminate class swelling agent take ettringite as expansion sources, the technical problem that cannot shrink the compensation water cement-based material middle and later periods, the invention provides a kind of fast advantage of hydration rate that both possessed, possess the Q phase aluminate cement swelling agent of the advantage of middle and later periods expansion simultaneously.The present invention also provides the preparation method of this Q phase aluminate cement swelling agent.

Technical scheme

A kind of Q phase aluminate cement swelling agent, is comprised of Q phase cement clinker and the 40%-60% industry dihydrate gypsum of 60%-40%;

The Q phase aluminium mineral material that contains 80-99.9% in described Q phase cement clinker;

Described percentage ratio is mass percent.

Q phase aluminium mineral material refers to and consists of 6CaO.4Al ₂o ₃.MgO.SiO ₂mineral; Q phase (The Quaternary Phase) refers to CaO-Al ₂o ₃-MgO-SiO ₂a stable phase in quaternary system.

Above-mentioned Q phase aluminate cement swelling agent, also contains the monocalcium aluminate (being called for short CA) of 0.1-15% and the C 12 A 7 of 0.1-5% and (is called for short C in described Q phase cement clinker ₁₂a ₇), described percentage ratio is mass percent.

Above-mentioned Q phase aluminate cement swelling agent, is preferably comprised of 60% Q phase cement clinker and 40% industrial dihydrate gypsum.

Above-mentioned Q phase aluminate cement swelling agent, described Q phase cement clinker is preferably comprised of 90%Q phase aluminium mineral material, 5% monocalcium aluminate and 5% C 12 A 7.

Above-mentioned Q phase aluminate cement swelling agent, described Q phase cement clinker is preferably broken by 50-54% bauxitic clay, 36-40% Wingdale and 8-10% rhombspar process, grinding, moulding, calcining forms; Described percentage ratio is mass percent.

Above-mentioned Q phase aluminate cement swelling agent, Q phase cement clinker wherein and the granularity control of industrial dihydrate gypsum is for by 200 order square hole sieves, is less than weight percentage and is 6% tail over.

The present invention also provides a kind of preparation method of above-mentioned Q phase aluminate cement swelling agent: by broken respectively to Q phase cement clinker and industrial dihydrate gypsum, then mix; Carry out again grinding, granularity is controlled at by 200 order square hole sieves, be less than 6% tail over; Both obtained product.

In use, the addition of every gram of cement needs is 0.02-0.06g to Q phase aluminate cement swelling agent of the present invention.

Beneficial effect

Use compared with the prepared concrete of this Q phase aluminate cement swelling agent concrete prepared with using conventional expanded agent (adopting the sulplo-aluminate class swelling agent that ettringite is expansion sources), the degree of free swelling in its early stage is basically identical; And the degree of free swelling of middle and later periods is significantly improved; Especially 30 days later degree of free swelling are more much bigger than the rate of expansion of conventional expanded agent.Therefore, Q phase aluminate cement swelling agent of the present invention, possesses take ettringite as expansion sources the feature of early stage its expansion, possesses the feature that the brucite middle and later periods expands simultaneously, has made up the deficiency of conventional expanded agent; Later stage that can compensating concrete shrinks.

Meanwhile, Q phase aluminate cement swelling agent formula of the present invention is simple, and production technique is simple, is of value to production in enormous quantities.

Identical concrete material, adopting respectively ettringite is the sulplo-aluminate class swelling agent (being called for short conventional expanded agent) of expansion sources, Q phase aluminate cement swelling agent (being called for short Q phase swelling agent) prepared by embodiment 1-3, and the ratio that is 6:94 according to the mass ratio of swelling agent and cement is prepared concrete; Then test respectively concrete degree of free swelling (many parts of concrete statistic datas) as following table:

The length of time	Conventional expanded agent	Q phase swelling agent
			Rate of expansion (3 days)	3.63×10 ^-4	3.12- 4.67×10 ^-4
Rate of expansion (7 days)	4.40×10 ^-4	5.32 ^?- 5.80×10 ^-4
			Rate of expansion (28 days)	5.65×10 ^-4	8.60 ^?- 10.45×10 ^-4
Rate of expansion (60 days)	6.32×10 ^-4	10.56 ^?- 14.82×10 ^-4

As seen from the above table, after 7 days, adopt the degree of free swelling of Q phase aluminate cement swelling agent of the present invention more much bigger than adopting the degree of free swelling of the sulplo-aluminate class swelling agent that ettringite is expansion sources.

Embodiment

Percentage ratio described in following embodiment 1-3 is mass percent.

embodiment 1

The preparation of Q phase cement clinker: adopt bauxitic clay 52.57%, 1000 grams of Q phase cement slurries of ratio preparation of Wingdale 38.35% and rhombspar 9.08%; Through jaw crushing crusher machine, then enter planet mill grinding, moulding, then adopt the calcining of globars electric furnace, and normal temperature rise rate (10 ℃/min), firing temperature is controlled at 1250 ~ 1300 ℃, soaking time 30min; Obtain Q phase cement clinker, the content that wherein Q phase aluminium mineral material content is 80%, CA is 15%, C ₁₂a ₇content be 5%;

Contain the preparation of the expansive agent for cement slurry of Q phase aluminate: according to the proportioning of 60%Q phase cement clinker and 40% industrial dihydrate gypsum, prepare 400 grams of raw materials; By broken respectively to Q phase cement clinker and industrial dihydrate gypsum, then mix; Adopt planet mill to carry out grinding, granularity is controlled at by 200 order square hole sieves, 6% tail over; Both obtained product.

Detect and use the concrete degree of free swelling of this product: according to 5000 grams of the expansive agent for cement slurry of Q phase aluminate is 6%, cement is 94% ratio feedings; It is fully mixed; Water cement ratio (W/C) is than being 0.3; Mould is 25 × 25 × 275 3 gang mould moulding; The degree of free swelling that records each length of time is: 3d is 4.67 × 10 ^-4, 7d is 5.80 × 10 ^-4, 28d is 10.45 × 10 ^-4, 60d is 14.82 × 10 ^-4.

embodiment 2

The preparation of Q phase cement clinker: adopt bauxitic clay 50%, 1000 grams of Q phase cement slurries of ratio preparation of Wingdale 40% and rhombspar 10%; Through jaw crushing crusher machine, then enter planet mill grinding, moulding, then adopt the calcining of globars electric furnace, and normal temperature rise rate (10 ℃/min), firing temperature is controlled at 1250 ~ 1300 ℃, soaking time 30min; Obtain Q phase cement clinker, the content that wherein Q phase aluminium mineral material content is 90%, CA is 5%, C ₁₂a ₇content be 5%;

Contain the preparation of the expansive agent for cement slurry of Q phase aluminate: according to the proportioning of 50%Q phase cement clinker and 50% industrial dihydrate gypsum, prepare 400 grams of raw materials; By broken respectively to Q phase cement clinker and industrial dihydrate gypsum, then mix; Adopt planet mill to carry out grinding, granularity is controlled at by 200 order square hole sieves, 6% sieve; Both obtained product.

Detect and use the concrete degree of free swelling of this product: according to 5000 grams of the expansive agent for cement slurry of Q phase aluminate is 6%, cement is 94% ratio feedings; It is fully mixed; Water cement ratio (W/C) is than being 0.3; Mould is 25 × 25 × 275 3 gang mould moulding, and the degree of free swelling that records each length of time is:: 3d is 3.27 × 10 ^-4, 7d is 5.36 × 10 ^-4, 28d is 10.05 × 10 ^-4, 60d is 14.60 × 10 ^-4.

embodiment 3

The preparation of Q phase cement clinker: adopt bauxitic clay 54%, 1000 grams of Q phase cement slurries of ratio preparation of Wingdale 36% and rhombspar 8%; Through jaw crushing crusher machine, then enter planet mill grinding, moulding, then adopt the calcining of globars electric furnace, and normal temperature rise rate (10 ℃/min), firing temperature is controlled at 1250 ~ 1300 ℃, soaking time 30min; Obtain Q phase cement clinker, the content that wherein Q phase aluminium mineral material content is 85%, CA is 10%, C ₁₂a ₇content be 5%;

Contain the preparation of the expansive agent for cement slurry of Q phase aluminate: according to the proportioning of 40%Q phase cement clinker and 60% industrial dihydrate gypsum, prepare 400 grams of raw materials; By broken respectively to Q phase cement clinker and industrial dihydrate gypsum, then mix; Then mix; Adopt planet mill to carry out grinding, granularity is controlled at by 200 order square hole sieves, 6% tail over; Both obtained product.

Detect and use the concrete degree of free swelling of this product: according to 5000 grams of the expansive agent for cement slurry of Q phase aluminate is 6%, cement is 94% ratio feedings; It is fully mixed; Water cement ratio (W/C) is than being 0.3; Mould is 25 × 25 × 275 3 gang mould moulding, and the degree of free swelling that records each length of time is:: 3d is 3.12 × 10 ^-4, 7d is 5.32 × 10 ^-4, 28d is 8.60 × 10 ^-4, 60d is 10.56 × 10 ^-4.

Claims

1. a Q phase aluminate cement swelling agent, is characterized in that, Q phase cement clinker and the 40%-60% industry dihydrate gypsum of 60%-40%, consists of;

The Q phase aluminium mineral material, the monocalcium aluminate of 0.1-15% and the C 12 A 7 of 0.1-5% that in described Q phase cement clinker, contain 80-99.9%; In Q phase cement clinker, each component sum is 100%;

Described Q phase cement clinker, broken by 50-54% bauxitic clay, 36-40% Wingdale and 8-10% rhombspar process, grinding, moulding, calcining forms; Described percentage ratio is mass percent.

2. Q phase aluminate cement swelling agent according to claim 1, is characterized in that, 60%Q phase cement clinker and 40% industrial dihydrate gypsum, consists of;

In described Q phase cement clinker, the content that Q phase aluminium mineral material content is 80%, CA is 15%, C ₁₂a ₇content be 5%; Adopt bauxitic clay 52.57%, the ratio of Wingdale 38.35% and rhombspar 9.08% is prepared from.

3. Q phase aluminate cement swelling agent according to claim 1, is characterized in that, 50%Q phase cement clinker and 50% industrial dihydrate gypsum, consists of;

In described Q phase cement clinker, the content that Q phase aluminium mineral material content is 90%, CA is 5%, C ₁₂a ₇content be 5%; Adopt bauxitic clay 50%, the ratio of Wingdale 40% and rhombspar 10% is prepared from.

4. the preparation method of the Q phase aluminate cement swelling agent described in a claim 1-3: by broken respectively to Q phase cement clinker and industrial dihydrate gypsum, then mix; Carry out again grinding, granularity is controlled at by 200 order square hole sieves, be less than weight percentage and be 6% tail over; Both obtained product.