RU2794834C1 - Modified cement ground for road construction - Google Patents

Abstract

FIELD: road building materials.

SUBSTANCE: invention can be used in the construction of roads as a structural layer of the base of the pavement or an additional layer of pavement. The modified cement soil for road construction contains, wt.%: Portland cement PC, grade CEM I 32.5 H 8-10, soil 88-90.4, zeolite-containing rock activated in the vortex layer apparatus 18-22% of PC, polycarboxylate superplasticizer 0.5-1.0% of the PC, water 12-19 (depending on the optimum humidity).

EFFECT: increasing the frost resistance and strength characteristics of the cement soil while reducing the consumption of Portland cement.

1 cl,

Description

The invention relates to the field of road construction materials and can be used in the construction of roads as a structural layer of the base of the pavement or an additional layer of pavement.

The composition of the reinforced soil of the fortified soil is known, including clay soil, a lime-containing binder and a mixing agent, as a clay soil it contains clay or loam, as a lime-containing binder dolomite lime and lime-containing waste - Ca (OH) 2, as a mixing agent - calcium bicarbonate - Ca (HCO3) 2 and additionally a surfactant - surfactant polycarboxylate, in the following ratios, wt. %: specified clay soil - 39-42; dolomitic lime (in terms of CaO + MgO) - 10-18; lime-containing waste (CaOH) ₂ - 31-40; calcium bicarbonate Ca (HCO ₃ ) ₂ - 6-9; polycarboxylate by weight of the soil in the amount of 0.21-0.28 for loam, 2.2-2.9 for clay [1]. The disadvantages of this invention are the presence of a large number of components of the composition, which reduces manufacturability and increased consumption of components increases its cost.

Known composition, which includes man-made clay soil, mineral filler - lime waste, water and polycarboxylate plasticizer. The mass ratio of the components is as follows, %: clay - 46-78; lime waste - 7-30; plasticizer P-16 - 0.3-1.5; water - 14.7-22.5 [2]. The disadvantage of this material is the high content of waste lime to achieve high technical performance of the material.

A known composition for the device of functional layers of subgrade, including soil in the form of loam with a plasticity number of not more than 12, a binder in the form of a complex binder, obtained by joint grinding of Portland cement clinker, gypsum, an anionic oligomer such as additive Melment F10, wollastonite, active silica with a specific surface area 450 m2/kg with material ratio 17:1:0.2:1.7:0.1; at the following ratio of the components of the composition, wt. %: loam 72-76, complex binder 8-10, water the rest. [3]. The disadvantages of this invention is the introduced restrictions on the number of plasticity of the original soil, the technological complexity and energy consumption of joint grinding of clinker and modifying components.

The closest solution to the proposed invention is a reinforced soil for the construction of pavement bases for roads and railways. The reinforced soil for the construction of pavement bases for roads and railways contains, wt.%: technogenic soil - overburden with a content of clay particles of at least 16% 60- 70, mechanically activated dry fly ash 10-20, mineral binder - fast-hardening Portland cement with mineral additives - strength class 32.5 6-8, water 12-14, polymer composite in the form of a colloidal solution of high-molecular surfactants: poly (1- carbamoylethylene) and hydrolysis products of polyvinyl acetate 0.5-0.8 over 100% [4]. The disadvantages of this invention are the restrictions on the use of technogenic soil, the high content of mechanically activated fly ash, which reduces the manufacturability of the composition, as well as the content of the polymer composite with low dosages makes it difficult to introduce components according to the approved recipe.

The objective of the invention is to increase the frost resistance and strength characteristics of cement soil while reducing the consumption of Portland cement.

The specified technical result is achieved by the fact that the modified cement soil for road construction contains the mineral binder Portland cement - PC, activated in the apparatus of the vortex layer - ABC filler - zeolite-containing rock - DSP together with a polycarboxylate superplasticizer - PCS and water in the following ratio of components, wt. %:

- Portland cement CEM I 32.5 H 8-10%

- soil 88 - 90.4%

- zeolite-containing rock activated in ABC - 18-22% of PC

- PKS - 0.5 - 1.0% of PC

- water - 12-19% (depending on the optimum humidity)

An example of the use of modified soil. 10 kg of dried light silty loam was taken, dried to a constant weight, then a soil sample was prepared, grinding to a fineness of aggregates less than 5 mm. Next, the zeolite-containing rock was activated in ABC together with PKS, with a weight of 200 g. - DSP and 5 gr. - PKS. Activation time - 4 minutes. Then, in a dry state, soil, activated filler and Portland cement were mixed in an amount of 1 kg. Next, the mixture was moistened to the optimum humidity - 1.9 kg of water. Further, by the method of static compaction, cylindrical samples were made to determine the strength characteristics. The grade for the strength of the samples of the given composition corresponds to M 40, for frost resistance F 25 in accordance with GOST 23558.

Information sources

1. Patent, RU 2 774 461, E02D 3/12 (2021.08); C04B 28/30(2021.08); C04B 28/10(2021.08); C04B 18/04(2021.08); C04B 2111/20 (2021.08), Composition of fixed clay soil, Orekhov P.A., Zakrevskaya L.V., Nikolaeva K.A., Gandelsman A.I. Alexander Grigorievich and Nikolai Grigorievich Stoletovs "(VlGU)". , bid. 06/11/2021, publ. 06/21/2022, bul. No. 18.

2. Patent, RU 2 736 254, E01C 3/00 (2020.08); E01C3/003(2020.08); C04B 18/04 (2020.08); C04B 18/0427 (2020.08), Universal soil-concrete mix composition, Andreeva K.A., Zakrevskaya L.V., Kapush I.R., Yudin I.I., Patent holder Federal State Budgetary Educational Institution of Higher Education "Vladimir State University Alexander Grigorievich and Nikolai Grigorievich Stoletovs "(VlGU)". , bid. 06/17/2020, publ. 11/12/2020, bul. No. 32.

3. Patent, RU 2 750 536, E01C 7/10 (2021.02); C04B 28/18 (2021.02), composition for the arrangement of functional layers of subgrade, Bondarenko S.N., Logvinenko A.A., Serebrenikova M.V., Bodyakov A.N., patentee Federal State Budgetary Educational Institution of Higher Education "Belgorodsky State Technological University. V.G. Shukhov. , bid. 08.12.2020, publ. 06/29/2021, bul. No. 19.

4. Patent, RU 2 771 804, E01C 3/04 (2022.02); E02D 3/12(2022.02); C04B 28/04(2022.02); C04B 2111/20 (2022.02), Reinforced soil for the construction of pavement bases for roads and railways, N. A. Konovalova, D. V. Bespilotov, P. P. Pankov, E. A. Rush, N. D. Avseenko, Patent holder Federal State Budgetary Educational Institution of Higher Education "Irkutsk State Transport University". , bid. 06/30/2021, publ. 05/12/2022, bul. No. 14.

Claims (3)

Modified cement soil for road construction, characterized in that it contains a filler activated in the vortex layer apparatus - ABC - zeolite-containing rock - CSP together with a polycarboxylate superplasticizer - PKS, as well as a mineral binder Portland cement - PC, soil with the following ratio of dry components, wt. %: Portland cement CEM I 32.5 H 8-10 priming 88-90.4 ABC-activated zeolite-containing breed 18-22% of PC PCS 0.5-1.0% of PC, and additionally contains water - 12-19% to the optimum humidity.