CN1800073A

CN1800073A - Preparation method of adding agent for controlling concrete collapse loss

Info

Publication number: CN1800073A
Application number: CN 200610000802
Authority: CN
Inventors: 冯乃谦; 石云兴
Original assignee: 冯乃谦
Current assignee: Inner Mongolia Xingtai Construction Co., Ltd.
Priority date: 2006-01-13
Filing date: 2006-01-13
Publication date: 2006-07-12
Anticipated expiration: 2026-01-13
Also published as: CN100383076C

Abstract

The invention relates to a method of making additive for controlling concrete collapsing loss, belonging to building material technical field. The composition of said additive is: zeolitic powder, water reducing agent, calcium lignosulfonate and water. Its making method is: mix water reducing agent and calcium lignosulfonate in definite proportions, stir the mixture thoroughly; add natural zeolitic powder to the mixture in proportions and stir it; spray said mixture and add water to it in proportions, stir it at the same time, dry at the room temperature, and crush to get said additive.The additive making method in said invention is characterized by: there is only physical adsorption and desorption process without chemical reaction, therefore, it is friendly to environment without releasing of waste liquid, waste gas, waste slag, etc; it only needs strong mixing at normal temperature during the production process with simple production facilities, and the technique is easy to control. The additive is capable of diminishing and controlling collapsing loss, which could not only control collapsing loss of common concrete, but also control collapsing loss of high-intensity high fluidized form concrete.

Description

A kind of preparation method who controls the admixture of slump loss

Technical field

The present invention relates to a kind of preparation method who controls the admixture of slump loss, belong to building material technical field.

Background technology

It is introduced that China's concrete output has reached 2,000,000,000 m ³/ year.The ready mixed concrete annual production also reaches about 5～600,000,000 m ³/ year.The technical barrier that ready mixed concrete is run in the construction application process is that loss of slump is fast, and particularly the high-strength high-performance concrete is in transportation and construction process, and loss of slump is faster, is difficult to pumping construction.In summer, when commerical ready-mixed concrete was transported to the working-yard by stirring station, because loss of slump is too fast, concrete unloaded to come out, and have to the scene adds water and stirred again and concrete could be poured out.But this concrete does not guarantee quality, becomes waste product.Present some cement water reducing agent manufacturer, in order to control the slump loss, usually mix citric acid, tripoly phosphate sodium STPP and white sugar etc., volume reaches 10%-14%, increased concrete cost, also influenced concrete performance, can not harden for a long time after some concrete placement, too much caused because mix retardant.

Summary of the invention

The objective of the invention is to propose a kind of preparation method who controls the admixture of slump loss, with clinoptilolite or mordenite is the natural zeolite ultrafine powder of essential mineral composition, with high efficiency water reducing agent and calcium lignin sulphonate be raw material, a kind ofly promptly have diminishing, control loss of slump to prepare, again the admixture of certain enhancement arranged.

The manufacture method of the admixture of the control slump loss that the present invention proposes, the weight percent of each composition is:

Natural zeolite powder 20～35

Water reducer 25～35

Calcium lignin sulphonate 5～20

Water 15～20

Its preparation method may further comprise the steps:

(1) water reducer and calcium lignin sulphonate are mixed in proportion, in stirrer, stir, churning time is 5～10 minutes;

(2) drop into natural zeolite powder in proportion in said mixture, stirred 5～15 minutes, rotating speed is 30 rev/mins;

(3) in the mixture of above-mentioned steps (2) in proportion the spraying add water, stirred simultaneously 20～40 minutes, mixing speed is 30 rev/mins:

(4) dry at normal temperatures, crushing obtains admixture.

Natural zeolite powder among the above-mentioned preparation method is mordenite or clinoptilolite, and the zeolite powder median size is less than 10 μ m.

Among the above-mentioned preparation method water reducer be any in naphthalene water reducer, thionamic acid based water reducer or the melamine based water reducer.

The preparation method of the admixture of the control slump loss that the present invention proposes, utilize the enhancement of zeolite ultrafine powder itself to cement concrete, and zeolite powder is to the absorption and the desorption of high efficiency water reducing agent, by slow release water reducer, with the loss of control slump.This preparation method has following characteristics and advantage:

1, no chemical reaction, just therefore physical adsorption and desorption process do not have dischargings such as waste liquid, waste gas, waste residue, environmentally safe.

2, only need powerful mix under the normal temperature in the production process, production unit is simple, and technology is convenient to control.

3, admixture has certain diminishing efficient, has the function of control loss of slump again, and both can control the loss of slump of normal concrete, can control the loss of slump of high strength flowing concrete again.

Concrete aforesaid way

In the natural zeolite powder that uses in the embodiment of the invention, zeolite content has mordenite and clinoptilolite two classes greater than 60%, zeolite powder median size≤10 μ m.High efficiency water reducing agent has naphthalene series high-efficiency water-reducing agent (pulvis and aqua all can, the solid content of aqua water reducer is 35-40%), sulfamic acid high-efficiency water reducer (solid content 35%-40%), and melamine series high-efficiency water-reducing agent (containing amount of solid 35%-40%).

Embodiment 1

At normal temperatures, in the axle horizontal type forced mixer, drop into commercially available naphthalene series high-efficiency water-reducing agent of 4000g (pulvis is produced by Tianjin water reducer factory) and calcium lignin sulphonate 500g, after fully stirring 10 minutes, drop into natural zeolite powder 4000g, fully after the stir about 5 minutes, the water of 150g is slowly added with spray pattern, stir discharging in 30 minutes while spraying, be placed on drying in the sun canopy, crushing obtains the powdery admixture.

Result of variations such as the table 1 of flowing degree of net paste of cement behind the admixture that adds present embodiment, the variation such as the table 2 of slump.

Table 1

The kind of admixture and volume (%)	Cement type and consumption (g)	Water cement ratio (w/c) (%)	Degree of mobilization through the time change (cm)
			Degree of mobilization through the time change (cm)				Initially	30min	60min	90min
			Tianjin naphthalene series high-efficiency water-reducing agent 1.0%	Good new 425,300g	0.29	18	Initially	30min	60min	90min	No
Tianjin naphthalene series high-efficiency water-reducing agent 1.1%	Arrow is new 425,300g	0.29		Good new 425,300g	0.29	18	19	No			No
	Arrow is new 425,300g	0.29	Present embodiment admixture 1.4%	Good new 425,300g	0.29	19	19	No			19	19	19
Present embodiment admixture 1.4%	Arrow is new 425,300g	0.29	Present embodiment admixture 1.4%	Good new 425,300g	0.29	19	20	20	19	19	19	19	19

Table 2

The kind of admixture and volume (%)	Slump through the time change (cm)			Water cement ratio (w/b) (%)	Folk prescription concrete material consumption (kg/m ³)
	Slump through the time change (cm)				Folk prescription concrete material consumption (kg/m ³)					Initially	1 hour	2 hours	Water	Cement	Flyash	Sand	Rubble
	Tianjin naphthalene series high-efficiency (pulvis) 1.2	20	12		2	0.45	170	300	80	Initially	1 hour	2 hours	Water	Cement	Flyash	Sand	Rubble	750	1100
Present embodiment admixture 1.4	Tianjin naphthalene series high-efficiency (pulvis) 1.2	20	12	18	2	0.45	170	300	80	18	18	0.45	170	300	80	750	1100	750	1100

Cement type in the table 2 is general silicon 42.5.

Embodiment 2

Under the normal temperature, in the axle horizontal type forced mixer, with the commercially available amido sulfoacid series high-efficiency water reducer of 3000g (aqua, solid content 44%, building admixture factory by the Shandong perseverance produces) drop in the stirrer, slowly drop into natural zeolite powder 5000g while stirring, the powerful stirring 20 minutes becomes the dough shape, airing under field conditions (factors), fragmentation is rolled into the fine sand shape, obtains admixture of the present invention.

Result of variations such as the table 3 of flowing degree of net paste of cement behind the admixture that adds present embodiment, the variation such as the table 4 of slump:

Table 3

The kind of admixture and volume (%)	Cement consumption (g)	Water cement ratio (w/b) (%)	Degree of mobilization through the time change (cm)
			Degree of mobilization through the time change (cm)			Initially	60min	90min
			Tianjin naphthalene series high-efficiency (pulvis) 1.5	300g	30	Initially	60min	90min	220	160	No
Present embodiment admixture 1.5	300g	30	Tianjin naphthalene series high-efficiency (pulvis) 1.5	300g	30	235	235	230	220	160	No

Cement type in the table 3 is mountain aluminium 42.5.

Table 4

The kind of admixture and volume (%)	Cement type	Water ash (w/b)	Slump through the time change (mm)			Folk prescription concrete material consumption (kg/m ³)
			Slump through the time change (mm)			Folk prescription concrete material consumption (kg/m ³)					Initially	1 hour	1.5 hour	Water	Cement	Flyash	Sand	Rubble
			Amido sulfoacid series aqua (solid content 32%) 25	Mountain aluminium 42.5R	42	235	220	145	177	300	Initially	1 hour	1.5 hour	Water	Cement	Flyash	Sand	Rubble	120	750	1000
Present embodiment admixture 2.0	Mountain aluminium 42.5R	42	Amido sulfoacid series aqua (solid content 32%) 25	Mountain aluminium 42.5R	42	235	220	145	177	300	210	210	205	177	300	120	750	1000	120	750	1000

Embodiment 3

Under the normal temperature, in the axle horizontal type forced mixer, with the commercially available melamine based water reducer of 4500g (aqua, solid content is 35～40%, is produced by Nangyuan District, Beijing admixture factory) drop in the stirrer, drop into the 4000g natural zeolite powder again, stirred 15 minutes, be placed on drying in the sun canopy, crushing obtains the powdery admixture.

Result of variations such as the table 5 of slump behind the admixture that adds present embodiment:

Table 5

The kind of admixture and volume (%)	Cement type	Water cement ratio (w/b)	Slump through the time change (mm)					Folk prescription concrete material consumption (kg/m ³)
			Slump through the time change (mm)					Folk prescription concrete material consumption (kg/m ³)			Initially	30 minutes	60 minutes	90 minutes	120 minutes	Water	Cement	Powder	Sand	Stone
			Melamine based water reducer (aqua) 3	General silicon 42.5	30	240	180	120	165	275	Initially	30 minutes	60 minutes	90 minutes	120 minutes	Water	Cement	Powder	Sand	Stone	275	630	1100
Present embodiment admixture 2.5	General silicon 42.5	30	Melamine based water reducer (aqua) 3	General silicon 42.5	30	240	180	120	165	275	230	230	235	235	230	165	275	275	630	1100	275	630	1100

Claims

1, a kind of manufacture method of controlling the admixture of slump loss is characterized in that the weight percent of each composition in this admixture is: