Curing temperature affects the compressive strength of cement paste systems via pozzolanic reaction. However, different processes, climates, and weather conditions often result in initial curing temperatures. The relationship between is still an underexplored domain. To explore effect on calcium hydroxide (CH)-based fly ash composites, ashes from carbon sources were used to make CH-based strength, reaction rate, CH content, C-S-H generation analyzed. correlation rate content was...

Coal fly ash (CFA) is one of the industrial byproducts burning coal for energy production and has unburned carbon, which negatively affects its full potential use. The flotation technology can be effective in separating carbon from CFA, prestirring time crucial ideal initial conditions during process. To find suitable time, eight times, including 0, 1, 2, 3, 4, 5, 6, 7 min, were selected this paper, followed by CFA after prestirring. Parameters such as loss on ignition (LOI), removal rate...

Biomass fly ash is a sustainable, eco-friendly cement substitute with economic and performance benefits, being renewable compared to coal ash. This study examines using biomass (BFA) as sustainable substitute, comparing it Class F (CFA). With water–binder ratio of 0.5 replacement rates 10%, 15%, 20%, 25%, 30% (by mass), the research highlights BFA’s promising applications. BFA CFA were mixed into paste/mortar analyze their reactivity properties, hydration products CH C-S-H evaluated at 7,...

With the rapid development of urbanization, construction industry consumes a lot cement and produces large amount waste. To overcome this situation, rational use recycled aggregate produced from waste concrete is one solutions. In some countries, building has approved coarse aggregates in concrete, with limits. However, practically all existing standards regulations prohibit fine (RFA) concrete. Therefore, study on improving performance RFA vital. study, effects fly ash GGBS were...

The unburned carbon in fly ash inhibits the performance of concrete. A device using flotation method to remove was developed, and operating condition experimentally examined. According results, able unburnt from by installed micro bubble nozzles a whirl-type pump. removal efficiency improved when prior forced stirring carried out concrete mixer for 3 min, scavenger added into slurry at density about 60 wt%. It has also been confirmed that circulating water is more effective than not water....

The rapid expansion of construction, fueled by industry and economic population growth, has exacerbated the challenge managing construction waste, especially concrete waste. One promising solution lies in utilization recycled fine aggregate (RFA), combination with emerging geopolymer technology, an innovative alternative to traditional cement. This study systematically explores effects incorporating varying qualities quantities RFA into mortars. By using GGBS FA as raw materials replacing...

In this study, we developed the device to remove unburnt carbon from fly ash that applied flotation method, and experimentally examined operating condition of device. After scaled up full scale device, strength properties concrete with removed by it. According results, it was effectively able installed micro bubble nozzles a whirl type pump. The removal efficiency improved when prior forced stirring carried out mixer for 30 minutes, scavenger in slurry about 60 wt% density added to....

N-メチル2-ビニル5-エチルピリジニウム塩とメタクリル酸とを膜状で,均一に共重合させることによって,同一膜中に強塩基性の第4級アンモニウム基と弱酸性のカルボキシル基とを有する均一両性イオン交換膜を合成した。そして,膜中の両性基の共存割合と弱酸性基の解離状態を種々変化させることによって,両性膜の電気化学的性質が,如何に変化するかについて検討した。その結果,両性膜は,(a)弱酸性基がほとんど解離していない場合には,0.1N/0.2N-KCl溶液中では,ほとんど理想に近い陰イオン選択透過性を示すが,(b)弱酸性基が完全に解離した状態では,膜中の弱酸性基の割合が多ぐなるにつれて,両性膜は陰イオン選択透過性から,陽イオン選択透過性へと変化する。その中間の組成の膜では,両性基の相互作用によって,イオン選択透過性は小さく,Donnan吸着量は非常に大きい。ある組成の両性膜では,膜中の弱酸性基の解離状態を変化させることによって,可逆的に,膜のイオン選択透過性を変化させることができる。両性膜の1N-KCl溶液中での比抵抗は,(a),(b)いずれの場合も,ある組成で,著しく大きな値を示すことから,...

In order to use the fly ash reformed by flotation for concrete, system concentrate slurry from 10wt% 65wt% in around 30 minutes is demanded. this paper, we collected experimental data about cake filtration of slurry, and it was confirmed that could be explained Ruth theory. addition, equations estimate optimum when concentrated were led. And a case study design concentrator 10m3 shown.

Environment-conscious life-cycle design (eco-life-cycle-design) is a comprehensive method to reduce the environmental load and improve materials efficiency in total life cycle of closed loop production, service, demolition, recycle/reuse, reproduction building materials, components and/or systems. Special attention paid compatibility long service with harmony (ecobalance performance). This paper proposes discusses this eco-life-cycle-design for new external thermal insulation systems using...

砕砂全量使用時におけるフレッシュ性状の改善を目的とし、JISで定めた範囲内で砕砂の粒度分布を調整した時のモルタルの流動性把握および細骨材の物性値、粒子形状などの指標を用いて粒度構成、異なるペースト性状におけるモルタルの流動性について検討を行った。砕砂の粒度調整に伴い変化するモルタルの流動性の評価として細骨材の実積率、吸水率、微粒分量および粒子形状を用いるのは困難であり、最も関係しているのは粒度構成であることが明らかになった。しかし、細骨材によって粒度構成が流動性に影響を及ぼす度合いが異なり、また、同一粗粒率においても粒度分布は複数存在するため、モルタルのフレッシュ性状の評価および予測は困難であり、今後の検討課題となる。

Currently, various studies are being conducted on recycled aggregates. Use cases of aggregates have been increasing in recent years. However, since there still many problems with aggregate, some need to be improved for further dissemination. For example, creep characteristics. There few previous the phenomenon concrete using

In this paper, we presented the experimental discussion of samples recycled aggregate concrete with replacement natural fine by aggregate. Three mix kinds were produced and, for each these three kinds, two levels water to blinder ratio used 0%, 10% and 20% FA. The result tests drying shrinkage compressive strength comparison mercury intrusion porosimetry (MIP), in which cumulative pore volume different intervals studied at ages 28 91 days. Correlation graph might be predicted given W/B, days...

In this study, the logic of brick and plate layout to draw a working drawing was examined. The application design automatically in that greatly reduced labor time developed. developed CAD system operated, made as case study. conclusions are follows. plan have done it able complete about four days. It became clear shorten decrease construction cost considerably.

It is necessary to examine the foundation, T type wall, corner brick beam, and connection of floor interior materials actually construct it by SRB-DUP method. In this .study, was examined that construction technique detail house it. The conclusions are as follows. clarified method an original management set up anchor bolt in placed self leveling, managed vertical accuracy wall using leveling string at position etc. necessary.