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Related Concept Videos

Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

280
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
280
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

142
In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...
142
Curing of Concrete01:20

Curing of Concrete

181
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
181
Hot Weather Concreting01:20

Hot Weather Concreting

130
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
130
Testing Water Quality01:14

Testing Water Quality

198
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
198
Curing Methods01:26

Curing Methods

126
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
126

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Accelerated Curing for Glass-Based Mortars Using Water at 80 °C.

Taohua Ye1, Jianxin Lu2, Zhenhua Duan1,3

  • 1Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China.

Materials (Basel, Switzerland)
|March 25, 2022
PubMed
Summary
This summary is machine-generated.

Accelerated water curing at 80°C significantly enhances glass aggregate (GA) mortar strength, making 1-day curing comparable to 28 days at room temperature. Glass powder addition also mitigates alkali-silica reaction (ASR) expansion.

Keywords:
accelerated curingcompressive strengthglass aggregate mortarglass powder sizevolume stability

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Sustainable Construction

Background:

  • Waste glass recycling is crucial for sustainable construction.
  • Traditional curing methods for glass-based mortars are time-consuming and yield low early-age strength.
  • Alkali-silica reaction (ASR) can negatively impact the durability of glass aggregate (GA) mortars.

Purpose of the Study:

  • To investigate the effect of accelerated water curing at 80 °C on GA mortars.
  • To evaluate the influence of glass powder (GP) size on mortar properties and ASR mitigation.
  • To propose an efficient curing method for GA mortars.

Main Methods:

  • Mortars were prepared using glass aggregate (GA) and glass powder (GP) as cement replacement.
  • Accelerated water curing at 80 °C was applied for 1 day.
  • Standard water curing at 20 °C for 28 days was used as a control.
  • Compressive strength and volume change (ASR expansion) were measured.

Main Results:

  • Water curing at 80 °C showed a negligible effect on volume change compared to ASR expansion.
  • 1-day water curing at 80 °C yielded compressive strength comparable to 28-day curing at 20 °C.
  • Glass powder (GP) addition, particularly with a mean size of 47.9 μm, effectively mitigated ASR expansion.
  • GA mortars with 47.9 μm GP achieved higher compressive strength than those with 28.3 μm GP, even surpassing fly ash mortars under accelerated curing.

Conclusions:

  • 1-day water curing at 80 °C is a viable accelerated curing method for GA mortars, significantly improving early-age strength.
  • The use of GP, especially coarser particles (47.9 μm), effectively controls ASR expansion and enhances mechanical properties.
  • This study presents a promising approach for utilizing waste glass in high-performance mortars with reduced curing times.