Experimental study on mechanism of autogenous shrinkage of concrete

Tazawa, Ei-ichi; Miyazawa, S.

doi:10.1016/0008-8846(95)00159-x

Cited by 137 publications

(48 citation statements)

References 1 publication

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“…The primary reason for the propensity of (RCCHW) used in cultural heritage works concrete to cracking is autogenously shrinkage, which is a phenomenon ingrained in low w/c concrete. Autogenously shrinkage is defined as the external-macroscopically dimensional reduction of the cementitious system, which occurs under sealed isothermal unrestrained conditions due to self-desiccation [2]. This phenomenon is considered in the scientific literature and engineering practice as one the main problems of concrete, because autogenously shrinkage can result in early-age cracking [3].…”

Section: Methodsmentioning

confidence: 99%

LWA as Internal Curing Agent to Control Availability of Internal Curing Water in Concrete

Rendon

Rendon²,

Ramirez

2013

MRS Proc.

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The effectiveness of lightweight aggregate (LWA) as an internal curing agent (ICA) to reduce concrete shrinkage is evaluated for repair concrete used in cultural heritage works (RCCHW) using curing periods of 30 days. Normal weight aggregate is replaced by LWA at volume replacement levels ranging from 10 to 14%. The mixtures contain Portland cement maintaining the paste content at approximately 24.1% of concrete volume. Comparisons are made with mixtures containing low-absorption granite and high-absorption limestone normal weight coarse aggregates. At the replacement levels used in this study, LWA results in a small reduction in concrete density, no appreciable effect on concrete compressive strength, and a decrease in concrete shrinkage for drying periods up to 30 days. With a curing period of 14 days, all mixtures with LWA exhibited less shrinkage than the mixtures with either low-or high-absorption normal weight aggregates.

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Section: Methodsmentioning

confidence: 99%

LWA as Internal Curing Agent to Control Availability of Internal Curing Water in Concrete

Rendon

Rendon²,

Ramirez

2013

MRS Proc.

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“…Many studies have been devoted to this topic (Parrott, 1988;Tazawa and Miyazawa, 1995;Mangat and Limbachiya, 1995;Andrade et al, 1999;Rincón et al, 2008). However, very few quantitative investigations were conducted due to the diffi culties in experimental manipulation.…”

Section: Environmental Conditions and Modal Frequency Of Reinforced Cmentioning

confidence: 95%

Modeling of environmental influence in structural health assessment for reinforced concrete buildings

Yuen

Kuok

2010

Earthq. Eng. Eng. Vib.

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One branch of structural health monitoring (SHM) utilizes dynamic response measurements to assess the structural integrity of civil infrastructures. In particular, modal frequency is a widely adopted indicator for structural damage since its square is proportional to structural stiffness. However, it has been demonstrated in various SHM projects that this indicator is substantially affected by fl uctuating environmental conditions. In order to provide reliable and consistent information on the health status of the monitored structures, it is necessary to develop a method to fi lter this interference. This study attempts to model and quantify the environmental infl uence on the modal frequencies of reinforced concrete buildings. Daily structural response measurements of a twenty-two story reinforced concrete building were collected and analyzed over a one-year period. The Bayesian spectral density approach was utilized to identify the modal frequencies of this building and it was clearly seen that the temperature and humidity fl uctuation induced notable variations. A mathematical model was developed to quantify the environmental effects and model complexity was taken into consideration. Based on a Timoshenko beam model, the full model class was constructed and other reduced-order model class candidates were obtained. Then, the Bayesian modal class selection approach was employed to select the one with the most suitable complexity. The proposed model successfully characterizes the environmental infl uence on the modal frequencies. Furthermore, the estimated uncertainty of the model parameters allows for assessment of the reliability of the prediction. This study not only improves the understanding about the monitored structure, but also establishes a systematic approach for reliable health assessment of reinforced concrete buildings.

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“…Tazawa (1995; had invented a test method with a remarkable advantage that shrinkage of concrete could be measured even without enough intensity. However, it was difficult for the device to insure accurate alignment between the probes embedded in concrete with that installed at different curing time on contractometer.…”

Section: Test Instrumentmentioning

confidence: 99%

Effect of Shrinkage-Reducing on Early-Age Concrete Poured with Controlled Permeability Formwork

Tian¹,

Liu²,

Wu³

2012

Earth and Space 2012

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Experimental study on mechanism of autogenous shrinkage of concrete

Cited by 137 publications

References 1 publication

LWA as Internal Curing Agent to Control Availability of Internal Curing Water in Concrete

LWA as Internal Curing Agent to Control Availability of Internal Curing Water in Concrete

Modeling of environmental influence in structural health assessment for reinforced concrete buildings

Effect of Shrinkage-Reducing on Early-Age Concrete Poured with Controlled Permeability Formwork

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