Supramolecular impactmechanism of polycarboxylate superplasticizers on controlled hardening building nanocomposites

Khalikov, R. M.; Ivanova, Oxana; Korotkova, L.N.; Sinitsin, D.A.

doi:10.15828/2075-8545-2020-12-5-250-255

Cited by 4 publications

(2 citation statements)

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“…The pumpability of foamed gypsum nanocompositions in 3D printing can be enhanced by the addition of 0.8% highly effective superplasticizers based on comb-like polycarboxylate esters, which can significantly increase the consistency retention time [19]. The advantage of 3D printing technology in the construction of buildings using dry foaming agents is: robotization of the construction process, reduction of labor costs for the production of works.…”

Section: Application Of Nanomaterials and Nanotechnologies In Constru...mentioning

confidence: 99%

Effective use of dry foaming agents in the manufacture of foam gypsum thermal insulation nanocompositions

Shigapov¹,

Sinitsin²,

Khalikov³

et al. 2022

Nanobuild

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Introduction. The elaboration of foamed eco-friendly gypsum nanocomposites with low specific gravity, high thermal insulation, operational and technical and economic characteristics remains an urgent task. Controlled hardening of gypsum foam nanoassemblers using dry foaming agents is a promising direction in the technology of production of heat-insulating building materials. Methods and materials. The production of a foam gypsum composition was carried out in an ejector-turbulent mixer by mixing a gypsum nanobinder with functional foaming nanoadditives. Building gypsum G5 BII was used as a binder in the work; porization of gypsum compositions was carried out using an adsorbed foaming agent PBNS. Results. The transformation of liquid-phase foaming agents into solid-phase ones by binding water allows the production of gypsum foam compositions from dry mixtures, which gives high dosing accuracy, a good degree of homogenization of components and stable characteristics of foamed gypsum nanocompositions. In production conditions, a one-storey small-sized pavilion was built using a pilot 3D printer AMT S1160, in which vertical enclosing structures are filled with foamed heat-insulating nanostructured foam gypsum. Monolithic foam gypsum nanomaterial with a density of 300-400 kg/m 3 was used for insulation and sound insulation of attic floors during the overhaul of the historic building of the Veterans Hospital in Ufa. Discussion. The elaboration of technology for obtaining foam gypsum from dry mixtures is based on the advantage of manufacturing and using thermal insulation nanocompositions, which allows for significant punctuality of dosing and stable characteristics of foam gypsum building materials. Surfactants have a significant effect on the kinetics of the structure formation of the foam gypsum nanocomposition and slow down the coalescence of air bubbles. Conclusions. Nanoporous foam gypsum concrete, obtained as a result of controlled hardening, with a density of 400 kg/m 3 has a thermal conductivity of 0.12 W/(m•ºС) and a compressive strength of 1.4 MPa. The compressive strength of foamed foam gypsum using a dry foaming agent on sorbents is 17% higher than the strength of a heat-insulating nanomaterial prepared using traditional technology.

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Section: Application Of Nanomaterials and Nanotechnologies In Constru...mentioning

confidence: 99%

Effective use of dry foaming agents in the manufacture of foam gypsum thermal insulation nanocompositions

Shigapov¹,

Sinitsin²,

Khalikov³

et al. 2022

Nanobuild

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“…One of the effective ways to control the porous structure and strength of the interpore partitions of foam concrete is the introduction of modifying additives into the mixture during mixing, which reduce the water content while maintaining the necessary mobility of the concrete mixture and increase the strength of the cement matrix in the interpore partitions [5,[7][8][9][10]. Developing the composition of foam concrete, it must be taken into account that one part of the water is spent on foam formation, and the other part is used for cement hydration.…”

Section: Introductionmentioning

confidence: 99%

Structural and heat insulating cement based concrete with complex glyoxal based additive

Steshenko¹,

Simakova²,

Inozemtcev³

et al. 2022

Nanobuild

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Introduction. The article presents the results of studies of the effect of complex additive based on glyoxal on the properties of cement-based foam concrete mix and foam concrete of natural hardening. The relevance of the study is determined by the necessity to provide the required process parameters of mixture for transportation and laying the formwork, as well as providing strength and thermal and physical characteristics of wall structures for the development of the northern regions of Russia, including the Arctic zone. It has been proposed to decrease the shrinkage deformations of the concrete mix and increase compressive strength of hardened foam concrete by affecting the cement matrix with complex modifier based on glyoxal. Materials and methods. The effect of modifying additives on the properties of the foam concrete mixture and foam concrete was studied at a W/S mixture ratio of 0.45. Research has been carried out using test methods set out in national standards. The results of the study of the effect of complex modifying additives (CMA) based on an aqueous solution of glyoxal and organic acids on the rheological and strength properties of foam concrete are presented, the regularities of the processes and the mechanism of structure formation of the modified foam concrete are determined. Results. The use of modifying additives leads to increase result in increasing the aggregative stability and reducing the plastic shrinkage of the foam concrete mix by 22-70%. In foam concrete with the complex additive LA 0.5% + Gl 0.55% the compressive strength rises from 1.96 to 2.43 MPa at the age of 28 days while maintaining the average density of D600. The thermal conductivity coefficient of foam concrete modified with various additives decreased by 5-30% compared to references. Conclusions. The obtained results of the study create in the construction industry the basis for the import substitution of modifying additives on the domestic mineral resource base and the production of effective structural and heatinsulating concretes for the development of the northern regions of Russia.

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Changing the Technological Properties and Strength Characteristics of Highly Mobile Concrete by Introducing a Complex Modifier

Ilina,

Berdov,

Vishnyakov

et al. 2024

Construction Materials

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The article considers the effect of a complex modifier consisting of a superplasticizer and cement crystallohydrates on the properties of cement dough, a highly mobile concrete mixture and heavy concrete obtained by hardening the mixture under normal conditions over a different period of time. As an additive of the superplasticizer, Relamix-PK was studied, administered in an amount of 0.6–0.8 wt. % of cement consumption. The authors investigated finely dispersed hydrated cement as additional crystallization centers. With the introduction of this complex modifier, the delamination of a highly mobile concrete mixture decreases (water separation – by 2 times, water separation – by 3.8 times). There is a significant acceleration of hardening in the initial periods of concrete hardening. Thus, in relation to the additive–free composition, the strength of concrete, which hardened for 1 day under normal conditions, increased 3.5 times, 3 days – 2.5 times, 28 days – 2 times. At the same time, it should be noted that when cement crystallohydrates are added, the hardening process is accelerated more in the initial terms of strength gain. The greatest strengthening effect was obtained by adding a complex modifier consisting of 0.8% plasticizer and 2% hydrated cement.

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Supramolecular impactmechanism of polycarboxylate superplasticizers on controlled hardening building nanocomposites

Cited by 4 publications

References 0 publications

Effective use of dry foaming agents in the manufacture of foam gypsum thermal insulation nanocompositions

Effective use of dry foaming agents in the manufacture of foam gypsum thermal insulation nanocompositions

Structural and heat insulating cement based concrete with complex glyoxal based additive

Changing the Technological Properties and Strength Characteristics of Highly Mobile Concrete by Introducing a Complex Modifier

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