A new model to predict the optimal mix design of self-compacting concrete considering powder properties and superplasticizer type

Zhang, Jingbin; Han, Guoxuan; Shen, Dejian; An, Xuehui; Meye, Serges Mendomo

doi:10.1016/j.jmrt.2022.06.130

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…The behavior of superplasticizers is also a function of the structure and degree of polymerization. Side chains tend to extend from the adsorbed water-reducing admixture into the solution, and these side chains are anti-aggressive, and their steric hindrance significantly improves the fluidity of Portland limestone cement systems [ 44 ]. Increased fluidity decreases the efflux time and thus decreases the SPS values [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Impact of Superplasticizers on the Performance of Low-Grade Limestone-Based Cement Mixes

Muthu,

Kumar,

Ukrainczyk

et al. 2024

Materials

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Low-grade limestone (LGL) is not used to produce cement clinker, but this leftover material in cement quarries increases the water demand when used as a filler in concrete production. In this study, the effect of six commercial superplasticizers on the performance of cement mixes containing 35% LGL and 2% gypsum was investigated. The optimal doses of these superplasticizers were found in a range of different water/binder (w/b) ratios by conducting several Marsh cone and mini-slump tests. The addition of a superplasticizer with a higher active solid content produced a maximum cement flow, regardless of the w/b ratios. The LGL-based mortar samples admixed with this superplasticizer obtained a maximum compressive strength of about 36 MPa at the end of 28 days. SEM and XRD results showed the formation of a new calcium-rich mineral in their microstructure. These findings highlight the impact of the type and properties of superplasticizers on the performance of concrete mixes containing LGL as a supplementary cementitious material.

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Section: Resultsmentioning

confidence: 99%

Impact of Superplasticizers on the Performance of Low-Grade Limestone-Based Cement Mixes

Muthu,

Kumar,

Ukrainczyk

et al. 2024

Materials

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“…The increase of concrete strength occurs in the zone of its contact with the aggregate, due to the reduction of the water-cement ratio and capillary porosity of the contact zone due to a sharp decrease in Ca(OH)2 content [37][38][39] . These material properties are common for the investigated by us ash-cement concrete and fine-grained concretes based on complex additives from superplasticizers and are described in the works of N. M. Morozov et al 33) , L. Lei et al 34) , J. Zhang et al 35) . However, in the variant under study by us the cost of the initial material will be cheaper, the project is economically more profitable, and the problem of disposal of waste of man-made origin is solved.…”

Section: Discussionmentioning

confidence: 99%

Properties of Fine-Grained Concrete Using Ash of Kazakhstan

Zhakypova,

Uderbayev,

Saktaganova

et al. 2023

Evergreen

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The aim of the work is a study of the physical and mechanical properties of finegrained concrete using ash of Kazakhstan (namely: the influence of dispersion of hydro-removal ash and liquid glass additives on the properties of fine-grained concrete). This study aims to address the issue of improving the environmental impact, which ensures the quality of concrete by saving cement. It was established that ash in concrete contributed to the formation of a denser structure of the intergranular space of aggregates and a less defective contact zone of aggregates with cement stone. The analysis of the obtained results showed that ash-cement concretes hardened slowly under natural conditions. In the period of 7-14 days of hardening, as a rule, the strength of samples of fine-grained concrete with the addition of hydroremoval ash is lower than the strength of reference samples without ash. The increase in the strength of the samples in the period of 60 days was 6.6...7.0%, and in the period of 90 days -15.0...15.5% compared to the strength of 28 days. The experiments on ash absorption of CaO hydro removal from lime mortar were carried out. The degree of hydration in the ash-cement stone of the studied composition of the developed binder was determined. Research has shown that with a decrease in the concentration of calcium hydroxide in the liquid phase, the activity of the ash increases. This can be explained by the high content of the glass phase. The balance of hydrate neoplasms in the ash-cement binder was experimentally determined. The research results indicate the possibility of using ash in the production of crushed stone concrete as part of the following building materials: dense wall blocks, curbs, paving slabs, for pouring floors, for sound insulation, as a brick mortar.

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“…A correlation analysis was conducted as a first approximation [62] of the relationship between the compressive strength and the modulus of elasticity in LFS concrete. Three types of correlations were considered, the values of which are listed in Table 7.…”

Section: Analysis Of Correlationsmentioning

confidence: 99%

“…Only the first power of the compressive strength was considered in order to keep the simplicity of the application of the model [27,61]. Models were developed in which the relationship between the two variables was both directly and inversely proportional, encompassing all potential scenarios [12,62]. In addition, two different situations were addressed in this analysis.…”

Section: Non-time-dependent Modelsmentioning

confidence: 99%

Analyzing the Relationship between Compressive Strength and Modulus of Elasticity in Concrete with Ladle Furnace Slag

Revilla-Cuesta,

Serrano-López,

Espinosa

et al. 2023

Buildings

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The addition of Ladle Furnace Slag (LFS) to concrete modifies its compressive strength and modulus of elasticity and consequently impacts their relationship. This research evaluated both properties at 28, 90, and 180 days in concrete mixes produced with 5%, 10%, and 20% of two LFS types, both stabilized and non-stabilized. The relationship between them was then analyzed through these experimental results by adopting a statistical approach. A three-way analysis of variance revealed that both properties were affected by LFS differently. Thus, the effect of each LFS content on both features varied depending on its composition and pre-treatment. Furthermore, the effect of the LFS content on the compressive strength was also influenced by the age of the concrete. These facets implied that when analyzing the relationship between both mechanical properties, the monotonic correlations were stronger than the linear ones, reaching values between 0.90 and 1.00. Therefore, the double reciprocal regression models were the most precise ones for expressing the modulus of elasticity as a function of compressive strength. The model accuracy was further enhanced when discriminating based on the LFS type and introducing concrete age as a predictive variable. With all these considerations, the average deviations between the estimated and experimental values of 1–3% and the maximum deviations of 4–7% were reached, as well as R2 coefficients of up to 97%. These aspects are central to the further development of LFS concrete models.

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A new model to predict the optimal mix design of self-compacting concrete considering powder properties and superplasticizer type

Cited by 10 publications

References 31 publications

Impact of Superplasticizers on the Performance of Low-Grade Limestone-Based Cement Mixes

Impact of Superplasticizers on the Performance of Low-Grade Limestone-Based Cement Mixes

Properties of Fine-Grained Concrete Using Ash of Kazakhstan

Analyzing the Relationship between Compressive Strength and Modulus of Elasticity in Concrete with Ladle Furnace Slag

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