Experimental research on drying control condition with minimal effect on concrete strength

Zhang, Guohui; Li, Zongli; Zhang, Linfei; Shang, Yujuan; Wang, Hang

doi:10.1016/j.conbuildmat.2016.12.141

Cited by 31 publications

(14 citation statements)

References 23 publications

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“…It is evident from Figure 3 that the water-losing rate of cement paste reached the maximum value rapidly and then gradually decreased, while that of mortar and concrete showed a trend of rising first and then falling, which is similar to the observation of Zhang et al [25]. This isothermal drying process can be divided into three stages: rising-rate drying stage, falling-rate drying stage, and slow drying stage.…”

Section: Isothermal Drying Processsupporting

confidence: 81%

Isothermal Drying Process and its Effect on Compressive Strength of Concrete in Multiscale

Tong

et al. 2019

Applied Sciences

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Drying could change the microstructure of cement-based materials and inevitably affect their mechanical properties. The isothermal drying process of concrete at three scales and its effect on compressive behavior and microstructure were investigated. The deformations of cement paste, mortar, and concrete in the drying process all exhibit the characteristics of expansion first and then shrinkage. The porosity and average pore diameter increase after drying, which is mainly attributed to the increase of pores less than 100 nm diameter for paste and to the pores within 100~1000 nm for mortar. Drying makes paste denser, while the bonding between paste and aggregate is weakened. Microstructural studies indicate that the increase in compressive strength of concrete caused by isothermal drying is the competition result between the strengthening effect and the weakening effect, and is related to the paste content.

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Section: Isothermal Drying Processsupporting

confidence: 81%

Isothermal Drying Process and its Effect on Compressive Strength of Concrete in Multiscale

Tong

et al. 2019

Applied Sciences

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“…In order to assess the high-temperature behavior of the AA-paste, TGA-DTA analysis were performed up to 1500 °C, and compared to those of raw powders. determined up to 1500°C (5.40% up to 350 °C), showing a very high thermal stability compared to cementitious materials [58]. The first endothermic peak, centered at 102 °C, can be attributed to physically adsorbed water evaporation; the shoulder, at approx.…”

Section: Thermal Propertiesmentioning

confidence: 96%

“…Cement-based materials display a very high mass loss when heated, due to hydrated compounds decomposition [58]. In order to assess the high-temperature behavior of the AA-paste, TGA-DTA analysis were performed up to 1500 °C, and compared to those of raw powders.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Alkali-activated refractory wastes exposed to high temperatures: development and characterization

Coppola

Tardivat

Richaud

et al. 2020

Journal of the European Ceramic Society

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The feasibility to prepare alkali-activated materials starting from refractory wastes and their properties after exposure to high temperatures (800, 1000, 1200 and 1400 °C) were investigated. Two different aluminosilicate wastes were used: chamotte (CH, mainly composed of corundum, mullite and andalusite) and alumina-zirconia-silica (AZS, composed by baddeleyite, corundum and amorphous silica). Very high mechanical properties were achieved in both cases (28-days compressive strength of approx. 70 and 60 MPa for CH-and AZS-based pastes, respectively). Then, alkali-activated pastes were exposed to high temperatures. For both kinds of samples, a sharp increase of mechanical properties was obtained after exposure to 800 and 1000 °C thanks to the matrix densification. Above 1000 °C viscous sintering occurs leading to a further increase of mechanical properties. AZS-based materials were able to withstand high temperatures up to 1400 °C while CH-based pastes mechanical properties decrease at 1400 °C due to andalusite decomposition.

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“…In the second temperature interval (200-600 °C) endothermic peaks are observed at 373, 460, and 573 °C. The peaks at 373 °C and 460 °C originate due to the decomposition of the calcium-hydroxide [34], while the existence of the endothermic peak at 573 °C confirms the presence of quartz The cementing matrix is a heterogeneous mixture of crystal phases that correspond to minerals in cement or other components in mortar. In a micrograph taken at a magnification of 1.02 k×, ball-shaped, well-defined recesses are visible which are derived from water molecules that have been ejected from the surface by the preparation and hitting of the sample prior to analysis.…”

Section: Thermal Analysis Of the Hardened Mortar Samplesmentioning

confidence: 99%

Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

et al. 2021

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The presented study is a continuation of the research with the aim of finding a useful value of hazardous waste slag generated by the combustion of lignite in heating plants and its application in the construction industry. The different amounts of cement (10, 15, 20 and 25%) were replaced with waste slag and silica fumes in mortars and concrete production. Detailed physical–mechanical characterization was performed on the mortar and concrete samples according to standard procedures. Test results indicated that the replacement of cement with slag and silica fumes reduces the physical and mechanical properties of mortar and concrete, but cement composites retained the required structural properties. If 15–20% is considered an acceptable level of compressive strength decrease, then it can be concluded that waste slag can be implemented in practice and be used as a construction material, with cement replacement in the maximal amount of 20% (17.8% of slag and 2.2% of silica fumes). On hardened mortar samples with maximal possible cement replacement (20%), physical–chemical characterizations were performed and included X-ray and infrared spectrophotometry, scanning electron microscopy, and thermal analysis. Results showed the absence of new phases and the presence of only those which were characteristic for starting samples, predominantly portlandite, quartz, calcite and calcium silicate-oxide.

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Experimental research on drying control condition with minimal effect on concrete strength

Cited by 31 publications

References 23 publications

Isothermal Drying Process and its Effect on Compressive Strength of Concrete in Multiscale

Isothermal Drying Process and its Effect on Compressive Strength of Concrete in Multiscale

Alkali-activated refractory wastes exposed to high temperatures: development and characterization

Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

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