Kinetics of Drying Shrinkage and Creep: An Experimentally Based Code-Type Approach

2017 ◽  
pp. 24-32
Author(s):  
Fernando Acosta ◽  
Harald S. Müller
Keyword(s):  
Drying Shrinkage ◽  
Shrinkage And Creep ◽  
Code Type ◽  
Kinetics Of

scholarly journals Cement-Based Renders Manufactured with Phase-Change Materials: Applications and Feasibility

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Luigi Coppola ◽  
Denny Coffetti ◽  
Sergio Lorenzi
Keyword(s):  
Compressive Strength ◽  
Phase Change ◽  
Phase Change Materials ◽  
Residential Buildings ◽  
Setting Time ◽  
Drying Shrinkage ◽  
Hydration Kinetics ◽  
Mechanical Performances ◽  
Entrapped Air ◽  
Kinetics Of

The paper focuses on the evaluation of the rheological and mechanical performances of cement-based renders manufactured with phase-change materials (PCM) in form of microencapsulated paraffin for innovative and ecofriendly residential buildings. Specifically, cement-based renders were manufactured by incorporating different amount of paraffin microcapsules—ranging from 5% to 20% by weight with respect to binder. Specific mass, entrained or entrapped air, and setting time were evaluated on fresh mortars. Compressive strength was measured over time to evaluate the effect of the PCM addition on the hydration kinetics of cement. Drying shrinkage was also evaluated. Experimental results confirmed that the compressive strength decreases as the amount of PCM increases. Furthermore, the higher the PCM content, the higher the drying shrinkage. The results confirm the possibility of manufacturing cement-based renders containing up to 20% by weight of PCM microcapsules with respect to binder.

Experimental Investigation of Drying Shrinkage and Creep of Concrete Using Fibre-Optic Sensors

2007 ◽  
Vol 10 (3) ◽  
pp. 219-228 ◽  
Author(s):  
Allan C. L. Wong ◽  
Paul A. Childs ◽  
William Terry ◽  
Nadarajah Gowripalan ◽  
Gang-Ding Peng
Keyword(s):  
Experimental Investigation ◽  
Drying Shrinkage ◽  
Fibre Optic ◽  
Shrinkage And Creep

Drying shrinkage and creep properties of prepacked aggregate concrete reinforced with waste polypropylene fibers

2020 ◽  
Vol 32 ◽  
pp. 101522 ◽  
Author(s):  
Fahed Alrshoudi ◽  
Hossein Mohammadhosseini ◽  
Mahmood Md Tahir ◽  
Rayed Alyousef ◽  
Hussam Alghamdi ◽  
...  
Keyword(s):  
Drying Shrinkage ◽  
Polypropylene Fibers ◽  
Creep Properties ◽  
Aggregate Concrete ◽  
Shrinkage And Creep ◽  
Waste Polypropylene

Comparison of prediction provisions for drying shrinkage and creep of normal-strength concretes

2004 ◽  
Vol 31 (5) ◽  
pp. 767-775 ◽  
Author(s):  
N J Gardner
Keyword(s):  
Drying Shrinkage ◽  
Data Bank ◽  
American Concrete Institute ◽  
Strength Development ◽  
Model Code ◽  
Eurocode 2 ◽  
Shrinkage And Creep ◽  
Normal Strength ◽  
Creep Modulus ◽  
Indeterminate Structures

Calculating the response of concrete structures to loads that change with time, strain recovery under removal of load, relaxation of stress under constant strain, and redistribution of internal moments in indeterminate structures requires equations to predict the shrinkage and creep of concrete. Current North American practice would be to use the recommendations of American Concrete Institute ACI 209-82. The 2002 version of Eurocode 2 endorsed the use of the 1999 version of the 1990 Comité Euro-international du Béton (CEB) model code MC1990-99 shrinkage and creep equations. Bažant and Baweja and Gardner and Lockman have proposed prediction methods, known as B3 and GL 2000, respectively, to replace the current ACI 209-82 provisions. The practitioner needs to know what method would be appropriate in what circumstances, what input information is required, and what is the probable uncertainty. This paper compares the shrinkage and creep predictions of ACI 209-82, CEB MC1990-99, B3, and GL 2000 with the experimentally measured results given in the Réunion Internationale des Laboratoires et Experts des Matériaux, Systèmes de Constructions et Ouvrages (RILEM) data bank for normal-strength concretes.Key words: concrete, creep, modulus of elasticity, shrinkage, strength development.

Time-Dependent Properties of Lightweight Concrete Using Sedimentary Lightweight Aggregate

2010 ◽  
Vol 168-170 ◽  
pp. 2235-2240
Author(s):  
How Ji Chen ◽  
Wen Po Tsai ◽  
Ming Der Yang
Keyword(s):  
Lightweight Concrete ◽  
Drying Shrinkage ◽  
Lightweight Aggregate ◽  
Normal Weight ◽  
Time Dependent ◽  
Test Results ◽  
Fine Sediments ◽  
Normal Weight Concrete ◽  
Shrinkage And Creep ◽  
Shihmen Reservoir

A kind of lightweight aggregate (LWA) has been successfully developed in Taiwan, which was made by expanding under heat fine sediments dredged from the Shihmen Reservoir. In this study the performances of concrete made from the aforementioned LWA were tested and compared with those of the companion normal weight concrete (NC). The test results show that the so produced lightweight concrete (LWAC) exhibited a comparable time-dependent properties (i.e., compressive strength, elastic modulus, drying shrinkage, and creep) as compared with those of the companion NC. Based on the results, it can be concluded that the use of prewetted LWAs and the incorporation of pozzolan materials can effectively control the drying shrinkage of LWAC. The specific creep of the LC mixture was obviously higher than that of the NC mixture at the same curing time.

scholarly journals Strategies for improving dimensional stability of concrete

2016 ◽  
Vol 43 (10) ◽  
pp. 875-885
Author(s):  
P.L. Ng ◽  
Albert K.H. Kwan
Keyword(s):  
Dimensional Stability ◽  
Cement Content ◽  
Drying Shrinkage ◽  
Sustained Load ◽  
Early Age ◽  
Test Results ◽  
Dimensional Changes ◽  
Shrinkage And Creep ◽  
Concrete Mix

Changes in dimension of concrete due to early-age heat generation, long-term drying shrinkage, and creep under sustained load could lead to significant movements of the concrete structure and lock-up stresses if the movements are restrained. The lock-up stresses are often large enough to cause cracking and water leakage, thereby adversely affecting the serviceability and durability of the structure. Whilst the dimensional changes are quite variable because of their dependence on the environmental conditions and applied loads, they are all related to the concrete mix proportions. Generally, the dimensional stability of concrete can be improved by reducing its cement content and paste volume. Moreover, since the aggregate also shrinks, the dimensional stability can be improved by suppressing the shrinkage of aggregate as well. In this paper, strategies for improving the dimensional stability of concrete are formulated based on experimental research. Test results are presented to demonstrate their effectiveness and applicability.

Study on Strength, Shrinkage and Creep of Concrete Containing Ultrafine Fly Ash Composites

2012 ◽  
Vol 450-451 ◽  
pp. 162-167
Author(s):  
Bao Ju Liu ◽  
You Jun Xie
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
Experimental Results ◽  
Steam Curing ◽  
Curing Conditions ◽  
Shrinkage And Creep

At steam curing and moist curing conditions, the mechanical properties of concrete with different fineness and different proportions ultrafine fly ash-slag composite were studied. The experimental results indicated that the addition of ultrafine fly ash-slag composite had improved the long term mechanical properties of steam-cured concrete. The concrete with ultrafine fly ash-slag composite has lower drying shrinkage and creep compared to that of control concrete.

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