ผลของแร่ดินเบาหรือไดอะตอมไมต์ในปูนฉาบ

Abstract

Diatomite mineral is a type of sedimentary rock which, in terms of structure, is lighter and more brittle than general rock originated from sedimentation and deposition of single cell seaweed, namely the Diatom. The objective of this research is to study the effect of diatomite mineral in insulating masonry cement. The source of diatomite used from Mae-Tha district in Lampang province, which was blended in the proportions of cement : diatomite : masonry sand : limestone powder of 20:5:75:0, 20:8:72:0, 20:10:70:0, 20:5:0:75, 20:8:0:72, 20:10:0:70, 20:0:80:0, and 20:0:0:80 percent by weight. The basic properties of diatomite and physical properties, mechanical properties of diatomite masonry cement including compressive strength, tensile strength, and bonding strength, durability properties i.e. drying shrinkage and soundness, and thermal properties as thermal conductivity, thermal diffusivity, and specific heat were investigated.       

          From the test results, it was found that the percentages of diatomite replacement increased, flowability decreased, when compressive strength, tensile strength, and bonding strength reduced in comparison with the conventional masonry. Besides, the drying shrinkage of diatomite-masonry cement increased according to the increment of the diatomite replacements. Furthermore, the use of diatomite blended with limestone powder tends to reduce the thermal properties of diatomite-masonry cement comparing with those of the conventional masonry cement.