Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Szlachetka, Olga; Witkowska-Dobrev, Joanna; Dohojda, Marek; Cała, Anna

doi:10.1177/16878140211024434

Cited by 11 publications

(15 citation statements)

References 42 publications

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“…This implies that, given a specific PZT mechanical impedance ( Z a ), the change in the equivalent stiffness of bonging layers ( K b ) with the replacement ratio is very small. The changes in CR2 with the FA replacement ratio, mainly reflecting the changes in the boundary constraints on the PZT sensors, are closely related to the shrinkage of the hardened concrete [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

A PCA-Based Approach for Very Early-Age Hydration Monitoring of Self-Compacting Concrete Using Embedded PZT Sensors

Liu

et al. 2023

Sensors

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This work proposed a novel approach based on principal component analyses (PCAs) to monitor the very early-age hydration of self-compacting concrete (SCC) with varying replacement ratios of fly ash (FA) to cement at 0%, 15%, 30%, 45%, and 60%, respectively. Based on the conductance signatures obtained from electromechanical impedance (EMI) tests, the effect of the FA content on the very early-age hydration of SCCs was indicated by the predominant resonance shifts, the statistical metrics, and the contribution ratios of principal components, quantitatively. Among the three, the PCA-based approach not only provided robust indices to predict the setting times with physical implications but also captured the liquid-solid transition elongation (1.5 h) during the hydration of SCC specimens with increasing FA replacement ratios from 0% to 45%. The results demonstrated that the PCA-based approach was more accurate and robust for quantitative hydration monitoring than the conventional penetration resistance test and the other two counterpart indices based on EMI tests.

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Section: Resultsmentioning

confidence: 99%

A PCA-Based Approach for Very Early-Age Hydration Monitoring of Self-Compacting Concrete Using Embedded PZT Sensors

Liu

et al. 2023

Sensors

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“…As the dosage of CS increases to 1% of binder weight, its negative effect on drying shrinkage increases. This observation makes sense because CS, in general, reduces compressive strength and modulus of elasticity and it is generally accepted that an inverse relationship does exist between drying shrinkage and modulus of elasticity 24,32,35 …”

Section: Resultsmentioning

confidence: 99%

Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

Chari¹,

Naseroleslami

Ahmadi³

2023

Structural Concrete

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Calcium stearate (CS) is effective to reduce permeability of different building materials under nonhydrostatic pressure but more actions need to be taken to shed light on its main and side effects on properties of cement‐based materials. This research project investigates the effect of CS on properties of these materials. Compressive strength analysis shows that the addition of CS at the dosage of 1% of cement weight reduces this parameter by approximately 20% but reducing water‐to‐binder ratio, and replacing 7.5% of cement weight with silica fume (SF) compensate for the strength loss caused by CS. Results of drying shrinkage test show that the addition of CS slightly increases drying shrinkage but replacing 7.5% of cement weight with SF can compensate for the negative effects of CS on drying shrinkage. Permeability analysis shows that CS is not as effective as SF and natural zeolite (NZ) to improve impermeability under hydrostatic pressure but it is more effective than SF and NZ to improve impermeability under nonhydrostatic pressure because the addition of CS at the dosage of 1% of cement weight reduces capillary water absorption by roughly 60%. Therefore, the simultaneous use of CS and these supplementary cementitious materials improves not only impermeability under hydrostatic pressure but also impermeability under nonhydrostatic pressure.

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“…Shrinkage in concrete is influenced by several factors such as temperature, humidity, time, mix design, material characteristics, curing processes, and specimen geometry (Dey et al, 2021;Pecker, 2020). Wet curing also allows a total elimination of the shrinkage in the first 28 days (Szlachetka et al, 2021). Moisture migration causes dryingshrinkage is a major concern in cementitious materials and can lead to a high probability of cracking, resulting in a deterioration in long-term performance and serviceability (Tran et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Short-term Deformation Model based on Surrounding Relative Humidity of Concrete Plate under Humid Tropical Weather

2023

CER

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This paper presents the deformation model based on surrounding relative humidity on one full scale concrete plate with compressive strength of 60MPa in which the concrete plate was placed on several pedestals. This research was conducted in Indonesia, a country with humid tropical weather with dry-wet conditions. A plate specimen measuring 3.00m × 1.60m × 0.15m was used for the experiment. The load was applied at the age of 14 days. The concrete plate behaviour was obtained by using four embedded vibrating wire strain gauges. The specimen was observed between 7 to 97 days of period. As a result, deformation model is similar to surrounding relative humidity reflection model. The result of Omar et al., 2008 research in Malaysia also shows a resemblance to the reflection of surrounding relative humidity (SRH) model. The deformation or shrinkage model for high performance concrete plate is εt= -SRHt.10 -5 + SRHinitial.10 -5 . f + C. "f" is a factor of initial surrounding relative humidity, C is the factor related to the position, and surface area. Meanwhile, the average error in maximum deformation position is about 26.8%. A large difference indicates that the level of difficulty for humidity enter the pore network.

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Influence of compressive strength and maturity conditions on shrinkage of ordinary concrete

Cited by 11 publications

References 42 publications

A PCA-Based Approach for Very Early-Age Hydration Monitoring of Self-Compacting Concrete Using Embedded PZT Sensors

A PCA-Based Approach for Very Early-Age Hydration Monitoring of Self-Compacting Concrete Using Embedded PZT Sensors

Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

Short-term Deformation Model based on Surrounding Relative Humidity of Concrete Plate under Humid Tropical Weather

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