CN101838129B

CN101838129B - Premixed dry mortar

Info

Publication number: CN101838129B
Application number: CN2010101603563A
Authority: CN
Inventors: 肖雪军; 鞠宇飞; 刘文斌; 徐开胜; 张小鹏
Original assignee: CHANGZHOU ZHONGHUA BUILDING MATERIAL TECHNOLOGY Co Ltd; Changzhou Vocational Institute of Engineering
Current assignee: CHANGZHOU ZHONGHUA BUILDING MATERIAL TECHNOLOGY Co Ltd; Changzhou Vocational Institute of Engineering
Priority date: 2010-04-30
Filing date: 2010-04-30
Publication date: 2012-08-29
Anticipated expiration: 2030-04-30
Also published as: CN101838129A

Abstract

The invention relates to a building material technology, in particular to a concrete premix. A premixed dry mortar is prepared by mainly mixing the components of 12-25 percent of cement, 3-4 percent of pulverized fuel ash, 32-50 percent of yellow sand, 2.7-3.4 percent of mortar thickening powder and 0-0.05 percent of additive. The premixed dry mortar is characterized in that sodium silicate casting used sand is added in the main components. The invention solves the problem of larger consumption of the yellow sand in the traditional premixed dry mortar.

Description

Dry-mix

Technical field

The present invention relates to building material technology, relate in particular to a kind of concrete and use Preblend.

Background technology

Cast used sand can be divided into three kinds of wet type old sand, resin bonded sand and used sodium silicate sands.But with regard to regenerating used, be difficult relatively.The depleted old sand is an alkalescence, and part is toppled over by institute, and not even a blade of grass grows, adds China's high grade quartz sand resource relative shortage, if the old sand comprehensive utilization is not discarded in a large number, is exactly the significant wastage to limited resources, and causes serious environmental to pollute.China is world's foundry industry first big country; China in 2008 foundry goods YO reaches more than 3,000 ten thousand tons, accounts for 40% of worldwide production, and the 1 year depleted old sand amount in the whole nation is more than 3,000 ten thousand tons; Major part is by uncontrollable discharge, and wherein the quantity discharged of water glass cast used sand is also more than 1,000,000 tons.The dehydration high-modulus sodium silicate water glass, yellow soda ash and the sodium hydrogencarbonate that contain in the water glass cast used sand can cause disadvantageous effect to the workability and the mechanical property of dry-mix, so the water glass cast used sand is not always as the raw materials for production of dry-mix.

Dry-mix is meant that fine aggregate and inorganic binder, water-keeping thickening material, mineral admixture and the additive handled through dry screened carry out a kind of particulate state or the powdery that physical mixed forms by a certain percentage; Form with packed or in bulk is transported to the building site, the material that can directly use after adding water and mixing and stirring.Stir mortar with conventional on-site and compare, dry-mix has following advantage: (1) excellent quality; (2) wide in variety; (3) workability is good; (4) easy to use; (5) environmental protection; (6) economy.Wherein the used fine aggregate of dry-mix mainly is natural yellow ground, and yellow ground is the maximum starting material of consumption in the dry-mix.Present yellow ground is Nonrenewable resources, and through market survey, ceiling price once increased to 100 yuan/ton in recent years, and the trend of this rise in price also clearly.Country will inevitably limit the exploitation of natural yellow ground to the protection of natural river course, makes the resource of yellow ground more and more nervous, will inevitably bring restriction to the development of dry-mix.

Summary of the invention

In order to overcome above-mentioned defective, the technical problem that the present invention will solve is: the bigger problem of yellow ground usage quantity in the existing dry-mix provides a kind of yellow ground usage quantity little dry-mix.

In order to overcome the defective that exists in the background technology; The technical solution adopted for the present invention to solve the technical problems is: a kind of dry-mix; Main constituent is that cement, flyash, yellow ground, mortar densification powder and admixture are mixed with and form; In main constituent, add the water glass cast used sand, the quality of constituent is formed as follows:

Cement: 12～25%

Flyash: 3～4%

Yellow ground: 32～50%

Water glass cast used sand: 32～50%

Mortar densification powder: 2.7～3.4%

Admixture: 0～0.002%

Admixture described in the present invention is water reducer, air entrapment agent or redispersable latex powder or above-described more than one mixture.

Described water reducer accounts for 0.1 of dry-mix quality～0.3 ‰ described in the present invention; Described air entrapment agent accounts for 0.06 of dry-mix quality～0.09 ‰; Said redispersable latex powder accounts for 0.1 of dry-mix quality～1 ‰; Above-mentioned used water reducer is a calcium lignin sulphonate, and air entrapment agent is an X 2073, and redispersable latex powder is the EVA rubber powder of Wa Ke company; Wherein calcium lignin sulphonate has delayed coagulation concurrently; Above-mentioned used mortar densification powder is the HZ-P highly effective water-keeping densification powder that Changzhou great positive building materials ltd is sold, and has good water-keeping thickening effect, can significantly improve the workability of dry-mix.

Employed cement is 32.5 or 42.5 ordinary Portland cements among the present invention, and the flyash that is adopted is II level ash, and it has better economic property when satisfying the technical feature requirement; The yellow ground of being selected for use among the present invention is a natural river sand, and its silt content is 0.9%, and fineness modulus is 2.3, and apparent density is 2640kg/m ³

Its composition of water glass cast used sand described in the present invention has SiO ₂, dehydration high-modulus sodium silicate water glass, yellow soda ash and sodium hydrogencarbonate, also have a spot of red stone simultaneously, wherein SiO ₂Content is more than 90%, and fineness modulus is 1.9, is mainly silica sand, and silt content is 4.0%, and fineness modulus is 1.9, and apparent density is 2610kg/m ³Wherein " mud " in the water glass cast used sand is different from " mud " in the natural yellow ground, mainly is tiny silica powder, can be used as the flour filler in the dry-mix, and is less to the properties of dry-mixed mortar influence.Experimental study shows that under the same intensity grade, the water glass cast used sand less than 60% o'clock, does not have negative interaction to dry-mix workability and mechanical property for sand coarse aggregate ratio.This external water glass cast used sand and yellow ground can be through changing the dry-mix that cement-sand ratio prepares different intensity grades under the situation of mixing.

Beneficial effect: under the prerequisite that guarantees identical properties of dry-mixed mortar, utilize water glass cast used sand instead of part yellow ground, can solve the stacking problem of old sand like this, can reduce the cost of dry-mix again as gathering materials the preparation dry-mix.The destruction that simultaneously can avoid the water glass cast used sand that environment is caused.

Embodiment

The present invention is described further through following instance.

Instance 1～6 takes by weighing different material according to the quality mixture ratio in the table 1 and mixes, and the water of adding 17～22% stirs.Testing used cement is 32.5 ordinary Portland cements, and the yellow ground fineness modulus is 2.3, and water glass cast used sand fineness modulus is 1.9, and flyash is II level ash.

Can find out that by table 1 test-results along with the increase of water glass cast used sand volume, dry-mix intensity is on a declining curve.The water glass cast used sand for sand coarse aggregate ratio below 60%, very little to the influence of intensity, also very little to the mortar working Effect on Performance.

Instance 7～12 takes by weighing different material according to the quality mixture ratio in the table 2 and mixes, and the water of adding 16～22% stirs.Testing used cement is 42.5 ordinary Portland cements, and the yellow ground fineness modulus is 2.3, and water glass cast used sand fineness modulus is 1.9, and flyash is II level ash.

Can know by instance 7～10 data, water glass cast used sand and yellow ground to the situation of mixing under, can prepare the dry powder motar of four strength grades commonly used through the adjustment wc, be respectively DPM5.0, DPM7.5, DPM10 and DPM15.Through the quality mixture ratio that instance 7～10 is embodied, can suitably reduce slurry consistency through the adjustment water requirement, can prepare the dry-mixed masonry mortar of four strength grades such as DMM5.0, DMM7.5, DMM10 and DMM15 of corresponding label.

Instance 11,12 shows, water glass cast used sand and yellow ground to the situation of mixing under, can prepare the dry powder ground mortar of DSM15 and two labels commonly used of DSM20, test-results shows workability and good mechanical properties.

Under the table 1 same intensity grade, the cast used sand volume is to the influence of dry-mix serviceability

Table 2 yellow ground, water glass cast used sand be under the situation of mixing, the preparation of different intensity grades dry-mix

Sequence number	Instance 7	Instance 8	Instance 9	Instance 10	Instance 11	Instance 12
							Strength grade	DPM5.0	DPM7.5	DPM10	DPM15	DSM15	DSM20
42.5 cement/Kg	196.3	226.3	256.3	286.3	271.5	351.9
							Flyash/Kg	50.2	50.2	50.2	50.2	66.6	66.6
Densification powder/Kg	50.2	40.2	40.2	40.2	54	54
							Air entrapment agent/Kg	0.0251	0.0201	0.0201	0.0201	0.027	0.027
Wood calcium/Kg	0.1506	0.1206	0.1206	0.1206	0.162	0.162
							Yellow ground/Kg	736.6	586.6	571.6	556.6	704.1	663.9
Water glass cast used sand/Kg	736.6	586.6	571.6	556.6	704.1	663.9
							Denseness/mm	109	86	106	100	41	60
28d intensity/MPa	6.6	11.6	13.7	15.8	17.99	20.48

Claims

1. dry-mix, main constituent are that cement, flyash, yellow ground, mortar densification powder and admixture are mixed with and form, and it is characterized in that: in main constituent, add the water glass cast used sand, the quality of constituent is formed as follows:

Cement: 12～25%

Flyash: 3～4%

Yellow ground: 32～50%

Water glass cast used sand: 32～50%

Mortar densification powder: 2.7～3.4%

Admixture: 0～0.05%

Said admixture is water reducer, air entrapment agent or redispersable latex powder or above-described more than one mixture.

2. dry-mix as claimed in claim 1 is characterized in that: described water reducer account for water glass cast used sand preparation the dry-mix quality 0.1～0.3 ‰; Described air entrapment agent accounts for 0.06 of dry-mix quality～0.09 ‰; Said redispersable latex powder accounts for 0.1 of dry-mix quality～1 ‰.

3. dry-mix as claimed in claim 1 is characterized in that: described its composition of water glass cast used sand has SiO ₂, sodium silicate water glass, yellow soda ash and sodium hydrogencarbonate contain red stone, wherein SiO simultaneously ₂Content is more than 90%, and fineness modulus is 1.9.