Influence of type of modified fillers based on dune sand on properties of cement paste, stone, and on technological and strength properties of concrete

Narov, Rustam; Rashidov, Jasur; Turgunbayev, Urinbek

doi:10.1051/e3sconf/202340101076

E3S Web of Conf.

2023

DOI: 10.1051/e3sconf/202340101076

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Influence of type of modified fillers based on dune sand on properties of cement paste, stone, and on technological and strength properties of concrete

Rustam Narov,

Jasur Rashidov,

Urinbek Turgunbayev

Abstract: Industrial enterprises are being built on a large scale in the desert regions of Uzbekistan. Concrete remains the main material in construction to this day. However, there is an acute shortage of sand of normal size. In this regard, an urgent task is to find effective and affordable technological methods for improving the properties of cement paste, concrete mix, and concrete on dune sand and cement savings. Taking into account our previous studies, the main attention was paid to establishing quantitative depe… Show more

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Cited by 3 publications

References 18 publications

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Development of intensive technology for constructing low-rise building walls from ash-cement mix

Narov

2023

E3S Web of Conf.

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There is a great demand for low-rise construction in Uzbekistan. In this regard, it is necessary to continue research on the intensification of the technology of monolithic low-rise housing construction using primarily local waste from various industries. One of them is fly ash waste from the electric power industry. It is proposed to use fly ash as a filler in a cement-ash composition, and it is considered more affordable. The use of other industrial waste as fillers requires additional special processing such as drying and grinding. It was established that fly ash is more accessible for practical use. From the point of view of the structural theory of composite building materials, fly ash has a plasticizing ability, which in turn helps to reduce water consumption. It was established that it is appropriate to use mineral additives in combination with other additives in the preparation of concrete mixes with high workability and low cement consumption. To determine the strength properties, samples were prepared from an ash-cement mix with a water-cement ratio of 0.32, with a fly ash content of 85% of the total mass of the mix. The hardener additive (soda powder) was used at 1.5% by weight of the binder and activated in the mixers for 2 -4 minutes. The results of the study show that the additive accelerates the hardening process of the ash-cement mix by 80-90% at one day of age, due to activation, the strength increases by 11-22% for the mix with/without the additive, respectively. When the mix is activated, the particles are struck and the inert film is torn off from their surface and free access of water to the ash particles is ensured; this, in turn, leads to an increase in the number of hydrate formations and a deeper occurrence of hydration processes. We studied the effect of the sequence of loading components in a working mixer on strength indices. The strength of the mechanically activated mix with 80% fly ash content and 1.5% addition of soda powder, reached 18.5-19.5 MPa. An ash-cement mix for concreting monolithic low-rise buildings was developed.

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Development of intensive technology for constructing low-rise building walls from ash-cement mix

Narov

2023

E3S Web of Conf.

Self Cite

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Dry mixes in modern construction using local raw materials and polymer additives

Turgunbayev,

Sharipova

2023

E3S Web of Conf.

Self Cite

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The article shows the results of studies of dry building mixes (DBM), their strength properties, classification, components of DBM, also shows the technological scheme for obtaining polymer cement glue using DBM technology and the dependence of the cohesive strength of polymer cement glue on the duration of mixing of DBM with water. The dependence of the cohesive strength of the polymer cement adhesive (PCA) on the specific surface of the sand, the dependence of the cohesive strength of the PCA on the content of the polymer additive and the dependence of the cohesive strength of the PCA on the content of the catalyst are also shown. As a result, the conducted studies have shown that the maximum strength is achieved with a specific surface area of mineral filler (sand) 2000 cm2 / g, polymer additive –5%, and NaOH catalyst -4%. The article also presents the goals of the technology of using dry mixes, trends determining the development of the mineral building materials industry, rational use and creation of new types of building materials more efficient and cheaper than traditional ones. In addition, the use of local raw materials and waste from various industries in the production of building materials is an important area of resource and energy conservation in the technology of construction production. And of course, dry mixes, in comparison with commercial mortar and concrete compositions, have a number of advantages, such as performing a minimum of finishing technological operations to transfer dry mixes to working condition (sealing with water), saving expensive cement (by 10-15%) due to plasticization and water retention of prepared solutions, stability of dry mix compositions in as a result of the precise dosage of components and their effective mixing, the productivity of builders increased by 20-25%, by improving the plastic properties of the prepared solutions and reducing transport costs by 15%.

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Unraveling the Effects of Compound Additives on the Strength of Cast Concrete

Rashidov,

Narov,

Yusupov

et al. 2024

RGSA

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Purpose: The aim of this study is to examine the influence of a complex additive on the fundamental physico-mechanical properties of cast concrete. Methods: The research involves the introduction of a complex additive, comprised of plasti-cizers such as "ACF," "SAFA," and "SOAPSTONE," into the concrete mixture. This leads to structural changes in the cast concrete, impacting its physico-mechanical properties, including strength, uniformity, deformability, durability, and cement utilization coefficient. The significance of each component of the additive is thoroughly examined to identify optimal dosages and meth-ods of introduction for achieving desired results. Results and Conclusion: The conducted analysis reveals insights into the impact of the complex additive on the final characteristics of the concrete. Optimal dosages and incorporation methods are identified, contributing to enhanced performance and durability of cast concrete structures. Research Implications: The practical aspects of utilizing the complex additive in real con-struction conditions are elucidated, with examples provided to optimize construction processes, increase efficiency, and reduce environmental burden. Furthermore, the study underscores the im-portance of further research in developing more effective and sustainable construction materials and technologies. Originality/Value: The research contributes to the advancement of knowledge in the field of construction materials by highlighting the influence of complex additives on the physico-mechanical properties of cast concrete. The obtained results have implications for improving the quality and durability of concrete structures across various construction sectors.

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Influence of type of modified fillers based on dune sand on properties of cement paste, stone, and on technological and strength properties of concrete

Cited by 3 publications

References 18 publications

Development of intensive technology for constructing low-rise building walls from ash-cement mix

Development of intensive technology for constructing low-rise building walls from ash-cement mix

Dry mixes in modern construction using local raw materials and polymer additives

Unraveling the Effects of Compound Additives on the Strength of Cast Concrete

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