延长混凝土工程寿命的简易途径

摘要

古代混凝土工程之所以耐久，除了它的化学组成和现代混凝土有所不同外，古代混凝土强度低、施工进度慢也是成就耐久的原因之一。现代混凝土工程短命的主要原因是施工进度过快。由于赶工期使许多工序被简化，使混凝土体内原始互不相通的微裂缝和微空隙数量增加、提前连通并延伸到混凝土表面，使大气中的冷热、干湿循环进入混凝土体内和钢筋表面，从而加速混凝土的劣化。为延长混凝土的承载服役寿命，在选择原材料及施工工艺正常的前提下应延长混凝土的龄期（从28d延长到60d），减慢施工进度。使混凝土承载能力成熟、原始微裂缝和微空隙稳定后再开始承载服役。%Ancient concrete strength is low, slow progress is the achievement of durable construction of one of the reasons. Rapidprogress of modern concrete construction, makes the body of concrete micro-- cracks and micro voids the initial increase in the number. Advanced connectivity and extended to the concrete surface. In the atmosphere of hot and Cold, wet and dry cycles into the body of concrete and steel surfaces. Accelerate the deterioration process of concrete. To extend the service life of concrete bearing, in the choice of Yuan materials and construction technology should be extended under the premise of the normal age of concrete, slow down the construction schedule, carrying capacity of the concrete maturity. The original micro--cracks and micro voids stable in service.