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- “自密实混凝土”已经发展并接近完成。迈向混凝土技术新时代
XK星空 “自密实混凝土”已经发展并接近完成。迈向混凝土技术新时代
自填充混凝土不需要压实，因为它仅利用重力作用填充到带有钢筋的模板中。它是世界公认的源自日本的原创技术，主要用于需要高强度的大型结构。但由于所用水泥品种的限制和用量较大，成本较高，阻碍了其在一般结构中的广泛使用。
Professor Masahiro Ouchi has developed a technology that reduces the amount of cement while maintaining the same self-filling properties as conventional concrete by making the air bubbles contained in concrete finer and reducing the friction that occurs between mortar and aggregate我们已经完成了“气泡润滑自密实混凝土”，可以降低成本。
2015年，我们开始与高知混凝土服务有限公司（高知市）联合研究，以确保实际使用的质量和稳定供应。 2018年，随着新型稠化剂的加入，质量进一步提高，可用于一般结构的经济型自密实混凝土的商业化已日益临近。
气泡润滑的自填充混凝土，可保持自填充性能并降低成本
混凝土通过用钢筋牢固地压实在模板内而达到设计的性能。压实需要技巧和经验，如果压实不足，不仅强度而且耐久性都有可能受损。为了解决这个问题，开发了“自密实混凝土”，它仅利用自身重量流入模板的每个角落，放置钢筋。 20世纪80年代初，随着混凝土过早老化成为社会问题，大内教授的导师冈村一教授（我校第二任校长）提出了该系统，并于1988年完成了原型机。迄今为止，该系统已用于明石海峡大桥等大型结构以及钢筋密集的长桥，有助于缩短施工时间并提高耐久性。但为了提供自填充性能，需要使用大量水泥，且水泥必须是低热值的特种水泥，且单价约为普通混凝土的两倍，因此在日本的渗透率仍保持在1%以下。
Since Professor Ouchi came across self-compacting concrete as an undergraduate, he has consistently developed technology to popularize it not only in large structures but also in general structures在开发一种即使减少水泥用量也能实现自填充的技术时，我们遇到了一个问题。这是因为减少水泥用量会增加材料之间的摩擦并损害流动性。 Therefore, they came up with the idea of ``instead of cement, we could increase the amount of fine air and use it like a cushion to reduce friction'' In 2013, by improving the mixing procedure, the air bubbles were made finer and the amount of air increased, giving the air bubbles a bearing effect that increases the fluidity of concrete and succeeded in suppressing friction between theこれにより、従来と同等の自己充填性を保持しながら、セメント量の低减かつ普通セメントの使用を可能とした、低コストで高信頼なコンクリートを完成させ、「気泡潤滑型自己充填コンクリート」と名付けた。
In 2015, we were selected for the Kochi Prefecture Industrial Promotion Center regional research results commercialization subsidy, and in collaboration with Kochi Concrete Service Ltd, we started developing manufacturing technology for practical use “我能想到的唯一一家进行联合研究的公司是 Kochi Concrete Service，”大内教授说道。他表示，他对该公司非常信任，该公司过去曾与他在产学合作项目上进行过合作。
“我们告诉他们我们设计的混凝土配合比，并让他们实际制作原型。Kochi Concrete Service 对材料具有出色的质量控制，并且始终按照设计完成混凝土。他们的技术能力是压倒性的。”
One of the reasons we trust them is that they don't just focus on immediate profits, but also have a greedy attitude toward developing new technologies
“他有一种投资未来的态度，相信技术发展中失败是不可避免的，他正在以创造好的产品为首要任务。”
The existence of partners who not only have high technical capabilities but also have a sincere attitude toward technological development is a strong driving force in research and development
利用粘合强度的“NATTO技术”大幅提高质量
A bubble-lubricated self-filling concrete that reduces the amount of cement while maintaining self-filling properties by increasing the number of fine air bubbles However, it has been found that when the ratio of water to cement exceeds a certain level, the adhesion between the mortar and aggregate decreases, causing peeling, making it impossible to obtain the required self-filling properties
"Considering the quality fluctuations in materials that occur during actual construction, we realized that it was necessary to further improve the quality of the air bubbles and reduce the amount of air to the same level as the standard amount of conventional concrete"
大内教授找到了解决这个问题的方法，通过添加“新型增稠剂”来提高砂浆的粘合强度。 Experiments revealed that by adding a new thickener, mortar adheres to the surface of the aggregate, suppressing peeling, reducing friction, and allowing mortar and aggregate to flow while maintaining uniformity
"We found that increasing adhesion through the addition of a new thickener improved the quality of the air bubbles and maintained their fineness over time This dramatically improved the self-filling properties and stability of bubble-lubricated self-filling concrete"
将这种高粘合强度与纳豆的粘性进行比较，该公司将其称为“从NATTO（流过障碍物的新粘合技术）技术发展而来的自密实混凝土”，并热衷于“推广NATTO技术”。
目前，我们距离普通结构经济型自密实混凝土的实际应用仅一步之遥。如果这成为现实，它不仅可以节省施工过程中的劳动力，而且还能够可靠地用密集的钢筋填充区域，从而提高其抗震强度。
Thirty years after the completion of the prototype, the technology that will accelerate the spread of self-compacting concrete has finally been realized可以说，这是混凝土技术新时代的开始。
- 来自合作伙伴公司的评论 Kochi Concrete Service Ltd 高知市鸭部上町 2-13
代表董事石原登I strongly sympathize with Professor Ouchi's desire to ``want to widely spread self-compacting concrete as ordinary concrete,'' and we have proceeded with our joint research to this point In recent years, the labor shortage has become increasingly serious in the civil engineering and construction industries, and the number of skilled workers responsible for concrete compaction work is decreasing If economical self-compacting concrete can be put into practical use, it will solve these problems and greatly expand the possibilities of concrete联合研究还提高了内部工程师的技术技能，并提高了整个公司的士气。
Yoshio Tanaka，董事兼工厂经理大约 30 年前，我们公司的董事长在一次讲座中从 Hajime Okamura 教授那里听说了自密实混凝土。他对此产生了兴趣并决定尝试一下，因此我们开始在内部考虑。当我正在反复思考“我想尝试进入预拌混凝土行业”时，2002年，大内先生找到了我，我们自己的自密实混凝土第一次被用于JR高知站附近的高架桥。作为制造商，我们常常直观地判断质量，但通过共同研究，要求我们进行详细的分析和量化，这是一个不断学习和发现的过程。
