RU2598254C2 - Mortar based on lime-sand mix - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction materials and can be used as solution for masonry works. Mortar includes lime-sand mix, Portland cement, a complex air-entraining additive and water, where the lime-sand mixture consists of 25 % lime-silica Binder and 75 % sand, the lime-silica binder is obtained by grinding a mixture of quartz sand and lime at a ratio of 1:1, the complex contains Murapor Kombi 756 air-entraining Agen and additionally microsilica, with the following component ratio, wt %: Portland cement 9.3-15.2, lime-sand mix 62.6-65.6, air-entraining Murapor Kombi 756 complex additive 0.03-0.07, microsilica 3.0-3.9, water - the rest.

EFFECT: reduced demixing, thermal conductivity coefficient, high viability.

1 cl, 2 tbl

Description

The invention relates to the field of building materials and can be used as a solution for masonry work.

The known composition of the mixed cement-lime mortar, including cement - 1 part, lime - 0.1-0.2 parts and sand - 2.5-3 parts [Chekhov A.P. et al. Concrete and mortar reference. - Kiev: Alarm Clock, 1979, p. 161].

Known mortar has the disadvantage of increased stratification and low water-holding ability of the mortar and has a high coefficient of thermal conductivity.

Known mortar containing cement, sand, water and an additional foam-forming additive "Queen" based on sodium stearate and as sand - molding waste of metallurgical production - mold waste in the following ratio of components, wt. %: cement 24-28; form waste 56-60; Quin foaming agent based on sodium stearate C ₁₇ H ₃₅ COONa 8-10; water 8-6 [RU 2139841 C1, IPC 6 С04В 38/10, publ. 10/20/1999].

Known mortar has the disadvantage of increased consumption of cement and insufficient viability of the mortar mixture.

Known mortar [RU 2283819 C1, IPC 6 C04B 38/00, publ. September 20, 2006], including Portland cement, sand, a foaming additive, water, as a foaming additive, contains a resin-saponin foaming additive and additionally contains a 20% solution of H ₄ SiO ₄ orthosilicon sol with a pH of 3.1-4.0, modified with tartaric acid ( C ₄ O ₆ H ₆ ), C = 0.9 wt. % and the additive "Antifreeze-DS" in the following ratio of components, wt. %:

Portland cement 43.93-47.59 sand 42.05-45.37 tar saponin foaming additive 0.16-0.17 20% solution of orthosilicon sol acid H ₄ SiO ₄ with pH = 3.1-4.0, modified tartaric acid (C ₄ O ₆ H ₆ ) 0.28-0.29 additive "Antifreeze-DS" 0.46-0.48 water 9.46-9.76

Known mortar has the following disadvantage: the complexity of the preparation of the stabilizer of the foaming additive is a resin-saponin foaming additive, a 20% solution of sol of orthosilicic acid H ₄ SiO ₄ with pH = 3.1-4.0, modified with tartaric acid (C ₄ O ₆ H ₆ ).

A known dry mixture for the preparation of mortars used in masonry from wall stones, bricks or concrete blocks, as well as for plastering walls, including Portland cement, quartz sand, a lightweight expanded aggregate and a surfactant, contains expanded perlite fraction as an expanded light aggregate less than 5 mm, as a surfactant - two components - a lignosulfonate plasticizer and an air-entraining additive sulfonol, and additionally - fluff lime, with a trace the ratio of the components, wt. h: Portland cement 1.0-1.2, quartz sand 0.5-2.0, the specified lightweight aggregate 0.1-0.5, the specified plasticizer 0.01-0.025, lime powder 0.1-0, 25, the specified air-entraining additive 0,015-0,04 [RU 2251539 C1, IPC 6 С04В 38/00, publ. 2005]. The technical result is a decrease in average density, an increase in water holding capacity, workability of the mortar mixture, as well as the possibility of obtaining the finished product in the factory.

A disadvantage of the known dry mix is the high consumption of Portland cement and the complexity of the preparation of the solution due to its multicomponent nature.

The objective of the invention is the creation of a new mortar, the use of which will ensure the achievement of a technical result consisting in reducing delamination, increasing water retention and viability of the mortar, reducing the thermal conductivity of the mortar while maintaining strength, while saving Portland cement and ease of preparation, and therefore, reducing solution cost.

The specified technical result is achieved by the fact that in a known mortar, including Portland cement grade M500, a sand-lime mixture, a complex air-entraining additive, the feature is that the sand-lime mixture consists of 25% lime-silica cement and 75% sand with a particle size modulus 1.1-1.3, wherein the lime-siliceous binder has an activity of 35-40%, a specific surface area of 5000-6000 cm ² / g and is prepared by co-milling a mixture of quartz sand and lime with an activity of 70-80% with a in a ratio of 1: 1, Murapor Kombi 756 is used as a complex air-entraining additive, consisting of surface-active substances (aqueous solution of alkyl acryl sulfonates) - 40% and an aqueous solution of polysaccharides and polyphosphates - 60%, and additionally the solution contains silica fume, in the following ratio of components, wt. %: Portland cement M500 - 9.3-15.2; lime-sand mixture - 62.6-65.6; silica fume - 3.0-3.9; Murapor Kombi 756 complex air-entraining additive - 0.03-0.07, water - the rest.

The causal relationship between the essential features of the claimed mortar and the specified technical result is as follows. The lime-sand mixture included in the solution contains a lime-silica binder (IQB), which is a 1: 1 mixture of finely ground sand and lime, which increase the water retention capacity of the mortar mixture, provide fine co-grinding of lime with sand, and increase the reactivity of quartz sand , which ensures the hydration activity of ICV.

Silica fume in the composition of the solution increases strength due to its interaction with lime in the ICV with the formation of calcium hydrosilicates, due to its high specific surface area it reduces delamination, increases the water-holding ability of the mortar mixture, and helps to reduce the density of the solution and, consequently, the thermal conductivity coefficient.

The complex air-entraining and retardation retardation additive due to the involvement of the smallest air bubbles in the mortar mixture reduces delamination, increases the water-holding ability of the mortar mixture, reduces the density of the solution, and hence the thermal conductivity coefficient, due to the presence of a moderator, increases the viability of the mixture.

The specified component composition of the mortar and the claimed ratio of the components allows to obtain a mortar mixture with low delamination, high water-holding ability and viability, to reduce the density and, consequently, the thermal conductivity of the mortar, while maintaining strength, while saving Portland cement, and therefore, reducing the cost of the mortar .

The lime-sand mixture is a semi-finished product in the production of silicate brick and consists of 25% lime-siliceous binder (IQB) and 75% sand. ICV is a mixture of quartz sand and lime obtained by joint grinding in a ratio of 1: 1.

As a complex air-entraining additive, Murapor Kombi 756 manufactured by MC-Bauchemie is used. The additive is a dark brown liquid with a density of 1.14-1.16 g / cm ³ .

A mortar based on a sand-sand mixture is prepared as follows.

From the hopper of inert materials, the lime-sand mixture (IPS) is dosed and fed into the concrete mixer. Portland cement and silica fume (MK) are stored separately in silos, from where they are fed to the concrete mixer at the same time as the lime-sand mixture. After mixing for 20-30 seconds, the required amount of water and a Murapor Kombi 756 complex air-entraining additive (Additive) are fed into the concrete mixer, after which the solution is mixed for another 1 min.

Table 1 shows the possible composition of the mortar.

Table 2 shows the characteristics of the inventive mortar.

With a decrease in the content of Portland cement, the claimed technical result is not achieved, i.e. the required strength of the solution is not achieved, and the increase is not economically viable.

With a decrease in the content of MK, the claimed technical result is not achieved, i.e. increase in water holding capacity and saving of Portland cement, and with an increase in the content, the connectivity of the solution increases significantly, the solution adheres to the tool.

Claims (1)

A mortar comprising a lime-sand mixture, Portland cement, a complex air-entraining additive and water, characterized in that the lime-sand mixture consists of 25% lime-silica binder and 75% sand, while the lime-silica binder is a mixture obtained by co-grinding quartz sand and lime in a ratio of 1: 1, as a complex air-entraining additive contains Murapor Kombi 756 and additionally contains silica fume, in the following ratio of components, wt. %:
Portland cement 9.3-15.2 sand-sand mixture 62.6-65.6 Murapor complex air-entraining additive 0.03-0.07 Kombi 756 silica fume 3.0-3.9 water rest