SU1595823A1 - Initial composition for making lightweight concrete - Google Patents

Abstract

The invention relates to building materials, namely lightweight concrete mixtures on porous slag aggregates, and can be used in industrial, civil and residential construction. The aim of the invention is to reduce cement consumption and increase the resistance of lightweight concrete to liquid aggressive media. Raw mix for the manufacture of lightweight concrete contains, wt%: slag Portland cement 5.9-10.5, fine ground slag additive 2.1-1.1, slag pumice stone 5-20 mm 40.9-41.8, slag pumice fraction ≥5 times 28.7-32.4, air entraining additive 0.5-0.6, bauxite sludge 1.6-5.9, water - the rest. The introduction of sludge reduces the required cement consumption to 115–200 kg / m 3 for concrete M 50 and increases its resistance in corrosive environments. 2 tab.

Description

The invention relates to construction materials, namely, light concrete mixes on porous slag aggregates, and can be used in industrial, civil and residential construction.

The purpose of the invention is to reduce the consumption of cement and increase the resistance of lightweight concrete to liquid aggressive media.

BOXIT Sludge is used as an active mineral additive and is a waste product of alumina production by hydrochemical method. It is represented mainly by / 2 CaO

. SiO-j, hematite, calcium and sodium aluminate hydrogranates and relatively high content (up to 3-4%) of alkali oxides.

The average chemical composition of bauxite head is given in Table. I.

The introduction of bauxite sludge into a light concrete mixture provides for the formation of low-base hydrosilicates of the tobermorite group, silicic acid, alkali and alkaline-mineral hydroaluminosilicates and calcite by the interaction of the alkaline components of the sludge with the slag component be-.

SL

x ate

eo

to

tones. At the same time, the sludge makes it possible to compact the structure of the mortar part by creating an uninterrupted granulometry, increasing the volume concentration of the dispersed component and thereby reducing the permeability of concrete. The basicity of the hydration products of psh-alkaline components, whose solubility is 20-50 times lower than that of cement hydration products, is low, the predominance of the gel, its pores and microcapillaries in the pore structure, as well as the clogging of kc by hydration products, determine

high physicomechanical properties of concrete and its corrosion resistance.

High solubility of alkaline oxides compared with clinker minerals and the ability to create an alkaline medium with sufficiently high pH values in aqueous solutions ensures hydration of low-basic silicate and aluminate phases of cement, increasing the rate of hydrate formation by the clinker part, and guarantee reliable passivation of the reinforcement

in concrete.

The increased hydraulic activity of the sludge itself is due to hydration / i-C, fSc with the formation of low-base compounds.

The presence of two types of directional structure formation determines the high hydraulic activity of the idle agent, which allows it to significantly reduce the consumption of its clinker

parts.

The air entraining additive is a mixture of resin of a neutralized air entraining fit-drazkzhevoy brew in the form of ..% s - solutions, taken in a ratio of

masoch. 5: 1. -

Raw mix for making lightweight concrete, including slag Portland cement, fine ground slag additive, slag pumice from 5-20 mm fraction, slag pumice from an "5 mm air entraining additive and WATER, characterized in that, in order to reduce cement consumption and increase durability of concrete to corrosive media, it contains additions of alumina. As coarse and fine porous slag aggregates, spraying pumice of 5-20 mm fractions and pshikopemzovy sand of the Novolipetsk metallurgical combine with 5 eduyuschih characteristics:. ° (p4i- ressivnym Wednesdays, about 0/5 1050 kg / cubic "s at v-term" tionary boksitovsh

squeezing in cylinder R.; . production at the next correlation by mass for 1 i Bft 19% (FR. 5 - 20 mm).

FOOT ABOUT IlyuI DE C - iJj f--

wearing components, wt.% 1

95823

d 15

jO; 25

,

- x

Slag Portland cement 300 of the Lipetsk Cement Plant, meeting the requirements of GOST 101 78-85, was used as a binder.

From the indicated raw materials, light concrete mixtures of the proposed compositions and the prototype were prepared.

Each mixture was prepared separately in a forced mixer using the following technology. Coarse and fine porous slag aggregates, finely ground slag admixture, bauxite sludge (except the composition of the prototype), cement, mixing water and air entraining solution were successively introduced into the mixer, the mixture was stirred for 3.5 min and standard samples were made 15 15 I 5 cm and 7.07 7, 07 cm. Compaction of mixtures was carried out on a standard vibro-platform with an oscillation frequency of 3000 rpm and an amplitude of 0.5 mm.

The samples were subjected to heat treatment in a steaming chamber according to the 4 + 3 + 8 + 2 h mode at t „S 90-95 C.

The compositions of the mixtures and the results of testing samples of concrete are given in

tabLo 2.

As can be seen from the data table. 2, with the introduction of bauxite sludge into the mixture, an improvement in the physicomechanical parameters and an increase in the resistance of lightweight concrete to aggressive ones are observed.

Wednesdays.

The introduction of bauxite sludge in an amount of 15–1000% by weight of cement makes it possible to reduce the consumption per hectare to 2000–115 kg (13–50%) per I m of concrete in a continuous porous structure while maintaining its strength.

40

Claims (1)

Invention Formula Raw mix for making lightweight concrete, including slag Portland cement, fine ground slag additive, slag pumice from 5-20 mm fraction, slag pumice from an "5 mm air entraining additive and WATER, characterized in that, in order to reduce cement consumption and increase durability concrete to corrosive media, it contains additional alumina-pressing mediums, especially bauxite  production at the next corresponding production at the next FOOT ABOUT IlyuI DE C - iJj f-- wearing components, wt.% 1 ment aco tailcoat dress coat 15958236 5,9-10,5 Air is enticing 2.1-5.1 ( five 40.9-41.8 28.7-32.4 additive Bauxite slime of clay-ground production Water additive Bauxite slime alumina production Water 0.5-0.6 1.6-5.9 Else Components Content,% SiO I AljOj I FejOj CaO j Ti I p.pt. It is grinding the addition of blast furnace slag 37.5 6.7 0.4 44.2 6.7 2.1 The rest Bauxite slurry 22.5 7.2 20.8 39.3 3.5 0.4 Else table 2 ------. ,, i PerformanceDesign Offered -t --- g- Prototype .Ljj ... LL ... material consumption on M concrete slag portland cement tokomolota slag additive bauxite slime slag pumice fraction 10 - 20 mm slag pumice fraction 5 - 10 mm  slag pumice fraction O - 5 mm 115 579 100 sTi 115 579 450 237Г 350 T777 560 2877 Table 1 2000 Go, 5 40 30 GB 450 2377 350 T87G 620 327b 230 T27T 40,271 450 2378 350 G875 620 3278 Indicator air entraining additive (START + RRT, 5% solution) mixing water Concrete density in dry condition (), kg / m Concrete strength at compression for 28 days after TVO, MPa The strength of concrete when szha with long-term (3 carried) effects: distilled water MgS04-HjO solution (one%) solution (5%) CaSO solution (0.2%) In the numerator, the consumption of Kg / l, in the denominator - wt.%. Compiled by 0. Motorina Editor N. Kishtulints. Tehred D.Oliynyk Proofreader S. Shevkun Order 2885 Circulation 568 Subscription VNIIPI State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR 1130.35, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Continuation of table.2 Composition Proposed ilJ. Prototype 1 ± 2 0.5 235 T272 1495 0.6 210 TT7o 1490 0.1 200 Go7b 1510 6.3 6.9 5.9 7.2 6.2 6.3 6.1 4.8 2.2 4.3 5.2