Models for Strength Prediction of High‐Porosity Cast‐In‐Situ Foamed Concrete

Zhao, Wenhui; Huang, Junjie; Su, Qian; Liu, Ting

doi:10.1155/2018/3897348

Cited by 13 publications

(7 citation statements)

References 27 publications

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“…The values of theoretical porosity (obtained by helium porosimetry) were much higher in all samples (Table 3). This result was also obtained by Zhao et al [26] and explained due to the smaller molecule size of helium allowing this gas to reach previously inaccessible pores. As the theoretical porosity increases, the mortar is more homogeneous because the interparticle porosity is very low.…”

Section: Porosimetrysupporting

confidence: 81%

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Jerónimo

Soares

Aguiar

et al. 2020

Construction and Building Materials

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Section: Porosimetrysupporting

confidence: 81%

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Jerónimo

Soares

Aguiar

et al. 2020

Construction and Building Materials

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“…The foamed concrete mix design is commonly determined based on a trial and error approach [ 38 , 39 , 40 , 41 , 42 , 43 , 44 ]. The design of the experiment based on empirical or computational modelling [ 45 , 46 , 47 , 48 ] and statistical methods approaches have been implemented to analyze multifactor experiments and the model used in the prediction of compressive strength of foamed concrete with minimal mean square errors and standard deviation. In addition, the analysis of variance (ANOVA) is used to ascertain the influence of different factors on the various properties to get the optimal conditions for the target value, and the multiple regression approach is used to develop empirical relationships that are used for the mix design [ 49 , 50 , 51 ].…”

Section: Introductionmentioning

confidence: 99%

Relation between Density and Compressive Strength of Foamed Concrete

et al. 2021

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This study aims to obtain the relationship between density and compressive strength of foamed concrete. Foamed concrete is a preferred building material due to the low density of its concrete. In foamed concrete, the compressive strength reduces with decreasing density. Generally, a denser foamed concrete produces higher compressive strength and lower volume of voids. In the present study, the tests were carried out in stages in order to investigate the effect of sand–cement ratio, water to cement ratio, foam dosage, and dilution ratio on workability, density, and compressive strength of the control foamed concrete specimen. Next, the test obtained the optimum content of processed spent bleaching earth (PSBE) as partial cement replacement in the foamed concrete. Based on the experimental results, the use of 1:1.5 cement to sand ratio for the mortar mix specified the best performance for density, workability, and 28-day compressive strength. Increasing the sand to cement ratio increased the density and compressive strength of the mortar specimen. In addition, in the production of control foamed concrete, increasing the foam dosage reduced the density and compressive strength of the control specimen. Similarly with the dilution ratio, the compressive strength of the control foamed concrete decreased with an increasing dilution ratio. The employment of PSBE significantly influenced the density and compressive strength of the foamed concrete. An increase in the percentage of PSBE reduced the density of the foamed concrete. The compressive strength of the foamed concrete that incorporated PSBE increased with increasing PSBE content up to 30% PSBE. In conclusion, the compressive strength of foamed concrete depends on its density. It was revealed that the use of 30% PSBE as a replacement for cement meets the desired density of 1600 kg/m3, with stability and consistency in workability, and it increases the compressive strength dramatically from 10 to 23 MPa as compared to the control specimen. Thus, it demonstrated that the positive effect of incorporation of PSBE in foamed concrete is linked to the pozzolanic effect whereby more calcium silicate hydrate (CSH) produces denser foamed concrete, which leads to higher strength, and it is less pore connected. In addition, the regression analysis shows strong correlation between density and compressive strength of the foamed concrete due to the R2 being closer to one. Thus, production of foamed concrete incorporating 30% PSBE might have potential for sustainable building materials.

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“…A prefoaming method was used to produce the foamed concrete. First, bubbles with a density of 35 ± 5 kg/m 3 were prepared [24]. Second, the cement and water were weighed and mixed to produce the cement slurry.…”

Section: Methodsmentioning

confidence: 99%

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

Zhao

Han

et al. 2020

Advances in Materials Science and Engineering

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is study aims to investigate the relationship between the heat of hydration and the strength development of cast-in-situ foamed concrete. First, indoor model tests are conducted to determine the effects of the casting density and the fly ash content on the hydration heat of foamed concrete in semiadiabatic conditions. Second, compression tests are carried out to evaluate the development of the compressive strength with the curing time under standard curing conditions and temperature matched curing conditions. ird, the hydration heat development of the foamed concrete is tested in four projects. e results showed that the peak temperature, the maximum temperature change rate, and the maximum temperature difference increased with the increase in the casting density at different positions in the foamed concrete. For the same casting density of the foamed concrete, the peak temperature, the maximum temperature change rate, and the maximum temperature difference decreased with the increase in the fly ash content. For the foamed concrete without the admixture, the early strength was significantly higher under temperature matched curing conditions than under standard curing conditions, but the temperature matched curing conditions had a clear inhibitory effect on the strength of the foamed concrete. e strengths during the early stage and the later stage were both improved under temperature matched curing conditions after adding the fly ash, and the greater the fly ash content, the larger the effect. e maximum temperature increments were higher in the indoor model test than in the field tests for the same casting density. Reasonable cooling measures and the addition of fly ash decreased the maximum temperature increments and increased the corresponding casting times.

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Models for Strength Prediction of High‐Porosity Cast‐In‐Situ Foamed Concrete

Cited by 13 publications

References 27 publications

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Hydraulic lime mortars incorporating micro cork granules with antifungal properties

Relation between Density and Compressive Strength of Foamed Concrete

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

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