The behaviour of concrete in hot climates

Berhane, Zawde

doi:10.1007/bf02472429

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…In arid and semi-arid regions, of which Algeria is a part, the unfavorable combination of these factors is often encountered and can lead to rapid evaporation of moisture at first from the surface layers which results in uneven shrinkage and hence the creation of severe thermal stresses in the mortar. The influence of the main climatic factors on the evaporation rate of the water from the surface of the mortar is well demonstrated in previous research work [2][3][4].…”

Section: Introductionmentioning

confidence: 62%

“…It could be pointed out that systematic studies of the properties of concrete cast and continuously exposed to either hot-humid or hot-dry climates remain to be done [9][10][11][12][13]. These effects can adversely affect the quality of the mortar and implicitly that of the concrete, especially during hardening where the hydration phenomenon is considerably affected and the mortar being relatively weak, cannot consequently withstand the generated stresses [4,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Effect of Curing Mode on Concreting in Hot Weather

Bakir¹

2021

RCMA

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Most developing countries have hot climate, ordinary jobsites characterized by reduced of human resources, equipment and infrastructures. The objective of this article is to make an experimental study of the influence of the hot climate such as that of Algeria, on the different properties of concrete in the fresh state, such as excessive water evaporation from the concrete surface, increased demand for water, increased slump loss corresponding to additional water on job-site, higher plastic shrinkage cracking and difficulty in controlling air content. At the hardened state, we could mention a reduction of strength at 28 days, decreased durability resulting from cracking at long-term period. To show the problems linked to concreting under these conditions and to present the appropriate solutions concrete or mortar can withstand the conditions in which it is implemented. Thus, negative effects caused principally by hot weather concreting motivated the choice of the such study. The research experimental work conditions in which the cementitious matrix was kept concerned two different environments, namely hot and dry climate conditions (t = 40°, h = 0%) alike the climate of the region of M'sila., and that of a medium with a hot and humid environment (t = 40°, h = 100%). The output of the investigation demonstrated the crucial role of the cure method in hot regions. The comparison of results for a reference concrete kept in air without any curing measures with two curing types simulating hot weather environment of the region M’sila was undertaken. These obtained outcome results were discussed based on the influence of climatic conditions to conclude procedures for hot weather concreting and suitable cure methods.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of Curing Mode on Concreting in Hot Weather

Bakir¹

2021

RCMA

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“…For this reason the applications of HPLWAC has been widely increased, and is become used in buildings and constructions. The researches in the range of present investigation were very rear , most of them were studied the effect of hot weather on the properties of normal strength concrete [5,6,[8][9][10][11][12][13][14][15][16],several investigations have been made about the effect of hot weather conditions on the properties of the lightweight concrete [17][18][19] and high strength concrete [20][21]. Most of them were studied the influence of air temperature and relative humidity only (experiments in still air) that carried out in laboratory in an environmental chamber to simulated hot weather conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Impact Hot- Dry Weather Conditions on the Properties of High Performance Lightweight Concrete

Ahmed

Khalil

Jumaa

2018

ETJ

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The aim of this investigation is to produce high performance lightweight aggregate concrete in actual hot-dry weather conditions, and then study the combined effect of hot-dry weather conditions on the fresh properties of high performance lightweight aggregate concrete such as workability, initial and final setting time, measuring concrete temperature, and hardened concrete properties (compressive strength, splitting tensile strength and flexural strength, modulus of elasticity). The experimental program including the use of fixed mix proportions and was carried out in a typical Iraqi summer days (under actual conditions) of different times during the day, where the mean maximum temperature in shadow in July and August usually is more than 44° C and relative humidity of about 24 %, the results were compared with the specimens prepared and casted in laboratory and others in shadow site. The results indicate that as temperature rises, and relative humidity falls, the initial and final setting time were reduced, beside that actual drop in slump. The results also show that rising placing temperatures more than allowable concrete temperature that recommended in ACI 305 does not, as a rule, lead to lower strengths. The strength performance of concrete can remain unaffected by higher placing temperatures, or it can even improve over that at lower temperatures. Using pre-soaked lightweight aggregates (pumice) as internal water reservoirs for producing this type of concrete under actual hot-dry weather condition played positive role in improvement of concrete properties by compensate the evaporation of water due to the rising temperature and decreasing relative humidity, and provide additional moisture in concrete for a more effective hydration of the cement.

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“…Hot dry weather conditions normally cause problems in mixing, placing and curing of concrete such that its properties and serviceability can be impaired [4]. For instance, in fresh concrete high temperatures increase the rate of slump loss and reduce the time of set, thus making it necessary to place, compact, and finish the concrete in a shorter time.…”

Section: Introductionmentioning

confidence: 99%

Moisture distribution in drying ordinary and high performance concrete cured in a simulated hot dry climate

et al. 2004

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Adequate moisture is very important during early age of portland cement concrete. The Single Point Magnetic Resonance Imaging technique was used to study the effects of various lengths of moist curing, and the use of curing compound, on the amount and distribution of evaporable water during drying of ordinary and high performance concrete. The specimens subjected to six different curing regimes, were cast in triplicate for a total of 72. After moist curing at 38~ the specimens were subjected to uniaxial drying in an environmental chamber at 38~ and 40% relative humidity that simulated hot dry climate conditions. As the specimens were drying, Magnetic Resonance Imaging was used to study the evaporable water distribution, non-destructively and with millimetric resolution. The Magnetic Resonance Imaging profiles indicated a reduced moisture loss with increasing length of moist curing. Extended moist curing was especially beneficial for the two self-compacting concrete mixtures, particularly for the cover concrete. In all mixtures the use of curing compound was only marginally better than one day moist curing, but was significantly better than air curing, particularly for the cover concrete. The moisture diffusivity was evaluated from the transient moisture distribution profiles using the Boltzmann transformation method. The results indicated a strong dependence of the moisture diffusivity on the moisture content when above 80% saturation, whereas below this value it remains almost constant. The moisture diffusivity is significantly reduced with increased moist curing period.

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The behaviour of concrete in hot climates

Cited by 15 publications

References 9 publications

Experimental Study of the Effect of Curing Mode on Concreting in Hot Weather

Experimental Study of the Effect of Curing Mode on Concreting in Hot Weather

Effect of Impact Hot- Dry Weather Conditions on the Properties of High Performance Lightweight Concrete

Moisture distribution in drying ordinary and high performance concrete cured in a simulated hot dry climate

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