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砂浆中掺用微沫剂可以节约白灰;当水泥标号较高,砂浆强度等级较低,而又无条件掺用混合材时,为满足和易性要求,掺用微沫剂还可达到节约水泥的目的。 掺用微沫剂,既有利于改善砂浆和易性,便于施工操作,又宜于保证砌筑质量。为获得较好的经济和质量稳定可靠的微沫剂,许多单位都自行配制。由于忽视基本原理,有些单位配制时采用固定配方,是十分有害的。大家知道,配制微沫剂需用的NaOH(即烧碱)或Na_2CO_3(即纯碱)的量,与松香皂化值的大小有关。将配方固定,势必造成NaOH或Na_2CO_3非多既少的弊端,影响砂浆和易性、凝结时间和强度,有损砌
The use of micro-foam in mortar can save white ash; when the cement number is higher, the mortar strength level is lower, and when the mixture is unconditionally mixed, in order to meet the workability requirements, the use of micro-foam can also save cement. purpose. The use of micro-foams will not only help improve the ease of mortar, facilitate construction operations, but also ensure the quality of masonry. In order to obtain a stable and reliable micro-foam agent with good economical and quality, many units prepare themselves. Due to the ignorance of the basic principles, some units adopt a fixed formula when they are formulated, which is very harmful. As we all know, the amount of NaOH (ie, caustic soda) or Na2CO3 (ie, soda ash) required for the preparation of the microfoam is related to the saponification value of the rosin. Fixing the formula will inevitably cause the disadvantages of NaOH or Na_2CO_3, which will affect the mortar workability, setting time and strength, and damage