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首页> 外文会议>High performance and optimum design of structures and materials >Reduction in permeability of concrete, mortar and plasters by a chemical which retards water percolation and salt transfer
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Reduction in permeability of concrete, mortar and plasters by a chemical which retards water percolation and salt transfer

机译：通过阻止水渗透和盐分转移的化学物质降低混凝土，砂浆和灰泥的渗透性

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摘要

Capillary rise, chloride and other salt penetration are the major causes of damage to the structure and are closely related to permeability in concrete and mortar. In fresh concrete, the space between the particles is completely filled up with water. The excess water in pores evaporates after the concrete hardens. The loss of moisture causes the volume of the paste to contract which in turn leads to shrinkage stress and shrinkage cracking. Moisture vapor transmission is also a function of relative humidity gradient between surfaces and permeability of concrete. These result in salt efflorescence, corrosion in metals, alkali aggregate reactions, sulphate attack through formation of gypsum and ettringite, freeze and thaw disintegration, erosion, carbonation, etc. They have a serious destructive effect on the structure as a whole. Heritage and old buildings which are devoid of damp proof courses and anti-termite treatments are highly permeable to all these natural damaging agents and need serious attention. This paper intends to discuss the action of an indigenous chemical when applied in fresh concrete and injected in mortars between brick layers for old and heritage houses. This chemical has been able to reduce the permeability to a substantial extent and many of the problems discussed above were, by and large, eliminated.
机译：毛细管上升，氯化物和其他盐的渗透是破坏结构的主要原因，并且与混凝土和砂浆的渗透性密切相关。在新鲜混凝土中，颗粒之间的空间完全充满了水。混凝土硬化后，孔中多余的水分蒸发。水分的损失导致糊剂的体积收缩，从而导致收缩应力和收缩裂纹。湿气透过率也是表面之间的相对湿度梯度和混凝土渗透性的函数。这些会导致盐泛酸，金属腐蚀，碱聚集反应，通过形成石膏和钙矾石而发生硫酸盐侵蚀，冻融解体，侵蚀，碳化等。它们对整个结构具有严重的破坏作用。没有防潮层和防白蚁处理的传统建筑和老建筑对所有这些自然破坏剂具有很高的渗透性，因此需要引起高度重视。本文旨在讨论将本地化学物质应用于新鲜混凝土并注入灰泥中的灰泥中的作用，以用于旧房和文物房屋。该化学品已经能够在很大程度上降低渗透率，并且基本上消除了上面讨论的许多问题。

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