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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

121
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
121
Frost Resistant Concrete01:29

Frost Resistant Concrete

135
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
135
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

127
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
127
Cold Weather Concreting01:27

Cold Weather Concreting

111
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
111
Frost Action on Concrete01:27

Frost Action on Concrete

149
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
149
Accelerators01:17

Accelerators

110
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
110

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コールドパッチアスファルト混合物の充填剤組成の最適化と性能評価に関する研究

Congwei Bi1, Xueqi Wang2, Jikai Fu1

  • 1Shandong Hi-Speed Infrastructure Construction Co., Ltd., Jinan 250098, China.

Materials (Basel, Switzerland)
|August 28, 2025
PubMed
まとめ

コールドパッチアスファルト (CPA) 混合物の充填剤の組成を最適化すると,性能が向上します. ベントニットとセメントの比率と鉱物粉末の置換により,強度と安定性が著しく向上します.

キーワード:
コールドパッチされたアスファルトスラージフィルラー比混合比率の最適化溶媒を基に冷凍パッチしたアスファルト混合物

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科学分野:

  • 材料科学
  • 土木工学
  • 道路建設

背景:

  • 充填剤の性質は,冷凍パッチアスファルト (CPA) のスラージのレオロギーと機械的特性に重大な影響を及ぼします.
  • コールドパッチアスファルト混合物 (CPAM) の性能は,充填剤の組成によって直接影響されます.

研究 の 目的:

  • コールドパッチアスファルト混合物 (CPAM) の充填剤組成比を最適化する.
  • 鉱物粉末を部分的に代用する際に,ベントニットとセメントの理想的な比率を決定する.

主な方法:

  • 充填剤の組成を体系的に変化させるために,正交の試験設計が採用された.
  • 性能検証テストは最適化されたCPAMで行われました.
  • スキャニング電子顕微鏡 (SEM) を用いて,充填剤の分散と反応メカニズムを分析した.

主要な成果:

  • 充填剤の最適成分は,総用量の4. 3%,鉱物粉末の代用量の50%と,ベントニットとセメントの比率は0. 2:1であった.
  • 形成強度は7.37%,残留安定性は20.95%,凍結解凍分裂強度は17.13%増加した.
  • 水の安定性が著しく向上し,セメントとベントニットの分散と水分反応が確認されました.

結論:

  • 充填料の最適化比は,冷凍パッチアスファルト混合物の機械的特性と耐久性を大幅に改善します.
  • この研究は,フィラー最適化による性能向上の背後にあるマイクロメカニズムを明らかにしています.