Long-term drying shrinkage of self-compacting concrete: Experimental and analytical investigations

Abdalhmid, Jamila M. A.; Ashour, Ashraf; Sheehan, Therese

doi:10.1016/j.conbuildmat.2018.12.152

Cited by 69 publications

(21 citation statements)

References 21 publications

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“…Several factors can contribute to this phenomenon. The reasons may be the curing at low humidity [1,3]. Microfine cements are known to provide higher shrinkage compared to coarser ordinary Portland cement since microfine cement hydrates much faster due to a fine pore structure, which will retain more water at a given RH due to osmotic suction effects [26][27][28].…”

Section: Resultsmentioning

confidence: 99%

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Long-term mechanical and shrinkage properties of cementitious grouts for structural repair

Shamsuddoha¹,

Hüsken

Schmidt

et al. 2019

RILEM Tech Lett

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Grouts have numerous applications in construction industry such as joint sealing, structural repair, and connections in precast elements. They are particularly favoured in rehabilitation of structures due to penetrability and convenience of application. Grouts for repair applications typically require high-performance properties such as rapid strength development and superior shrinkage characteristics. Sometimes industrial by-products referred as supplementary cementitious materials (SCM) are used with neat cement due to their capabilities to provide binding properties at delayed stage. Micro silica, fly ash and metakaolin are such SCMs, those can modify and improve properties of cement products. This study aims at investigating long-term mass loss and linear shrinkage along with long-term compressive and flexural strength for grouts produced from ultrafine cement and SCMs. A series of mixtures were formulated to observe the effect of SCMs on these grout properties. Properties were determined after 365 days of curing at 23oC and 55% relative humidity. The effect of SCMs on the properties are characterised by statistical models. Response surfaces were constructed to quantify these properties in relation to SCMs replacement. The results suggested that shrinkage was reduced by metakaolin, while micro silica and fly ash had positive effects on compressive and flexural strength, respectively.

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Section: Resultsmentioning

confidence: 99%

“…Typical in-situ curing conditions for grouts in field application usually have much lower relative humidity. It is well known that lower relative humidity results in higher shrinkage [2][3][4]. This may increase shrinkage cracks and mechanical properties in the long run.…”

Section: Introductionmentioning

confidence: 99%

Long-term mechanical and shrinkage properties of cementitious grouts for structural repair

Shamsuddoha¹,

Hüsken

Schmidt

et al. 2019

RILEM Tech Lett

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“…The density of recycled aggregate is low, and old mortar and microcracks are commonly adhered to the surface [ 2 , 3 ]. The limited shrinkage and wear resistance of recycled concrete limit its application in practical engineering [ 4 , 5 , 6 ]. Studies exploring the mechanical properties of some recycled coarse concrete and fine concrete have obtained different conclusions and failed to achieve a unified standard [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Characteristics and Damage Mechanisms Investigation of Basalt Fiber Concrete with Recycled Aggregate

Zhang

Zhao

et al. 2020

Materials

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This paper presents the compression failure process of basalt fiber concrete with recycled aggregate and analyzes the main factors of basalt fiber and recycled aggregate affecting the compressive strength of recycled concrete. The damage mechanism of recycled aggregate concrete is analyzed by the acoustic emission technique. With the method of acoustic emission (AE) b-value analysis, the evolution and failure process of recycled concrete from the initial defect microcrack formation to the macroscopic crack is studied. Based on the AE clustering analysis method, the damage state of recycled concrete under load grade is investigated. Finally, the failure mode of recycled concrete is explored according to the RA-AF correlation method. The results show that when the concrete reaches the curing age, the strength grade of basalt fiber regenerated coarse aggregate concrete is the highest. The basalt fiber increases the strength of regenerated fine concrete by 4.5% and the strength of coarse concrete by 5%, and reduces the strength of fully recycled aggregate concrete by 6.7%. The b-value divides concrete into three stages: initial damage, stable development of internal damage, and internal damage. The variation of AE energy, count, and event number is related to AE activity and crack growth rate. Matrix cracking is the main damage state of concrete, which is greatly affected by the strength of cement mortar. The load grade of fiber cracking in fully recycled aggregate, recycled fine aggregate, and recycled coarse aggregate concrete is 65, 90, and 85%, respectively. Basalt fiber increases the tensile failure event point of recycled concrete and delays the cracking of recycled concrete under compression. When the load grades of fully recycled fiber, recycled fine aggregate fiber, and recycled coarse aggregate fiber concrete are 65–95, 90–100, and 85–100%, respectively, the tensile failure activity increases.

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“…In recent years, Fly Ash (FA) has been widely used as supplementary cement material in replacement of part of PC in concrete construction. In addition, the mixtures employing FA require low water content in order to achieve good workability (Abdalhmid, Ashour, and Sheehan, 2019;Duran-Herrera, De-León-Esquivel, Bentz, and Valdez-Tamez, 2019;Kristiawan and Aditya, 2015;Matos, Foiato, and Prudêncio, 2019). Dinakar et al (Dinakar, Kartik Reddy, and Sharma, 2013) described that about 30% -50% of FA content was ideal for the production of self-compacting concrete (SCC).…”

Section: Introductionmentioning

confidence: 99%

Effect of Supplementary Cementitious Material and Fine Recycled Aggregates on Shrinkage Properties of Self-Compacting Microconcrete

Larrañaga¹,

Tippareddygari²

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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An increase in the population has led to the progressive construction of infrastructures and buildings. This causes severe environmental problems, firstly high emissions of CO2 are caused in cement production; secondly, a high volume of construction and demolition waste is landfilled and thirdly, it is necessary to look for new, no natural resources for the production of construction materials. The objective of this work is to analyse the influence of fine recycled aggregates and high volumes of fly ash in the properties of high-performance self-compacting (SC) microconcrete. The experimental work presented in this paper was carried out in two phases. In phase 1, SC-microconcrete were produced with 100% of Portland cement, and natural sand was replaced by both mixed and ceramics recycled aggregates in 30% and 50%. In phase 2, SC-microconcretes were produced with the replacement of 50% of Portland cement by fly ash, and natural sand was replaced by both mixed and ceramics recycled aggregates in 30% and 50%. In each phase, the drying and autogenous shrinkage of all mortars was measured via their storage in a climate chamber after 24 hours of casting and the determining of properties during 90 days. In order to assess the influence of the shrinkage effect on the mechanical properties, the prismatic samples were also stored in a climatic chamber, and the compressive strength at several ages was determined in all of the SC mixtures. The results showed that the microconcretes produced employing mixed and ceramic fine aggregates achieved higher compressive strength and lower autogenous shrinkage. Although the C-N achieved the lowest drying shrinkage, the mixtures with 30% of CRA and MRA were found to have similar values. The employment of the CRA aggregates improved the drying shrinkage and compressive strength of the C-FAN mixture.

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Long-term drying shrinkage of self-compacting concrete: Experimental and analytical investigations

Abstract: Long-term drying shrinkage of self-compacting concrete: experimental and analytical investigations. Construction and Building Materials. 202: 825-837. Rights

Cited by 69 publications

References 21 publications

Long-term mechanical and shrinkage properties of cementitious grouts for structural repair

Long-term mechanical and shrinkage properties of cementitious grouts for structural repair

Acoustic Emission Characteristics and Damage Mechanisms Investigation of Basalt Fiber Concrete with Recycled Aggregate

Effect of Supplementary Cementitious Material and Fine Recycled Aggregates on Shrinkage Properties of Self-Compacting Microconcrete

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