The invention relates to the technical field of building materials, in particular to dry-mixed
mortar with a heat insulation function and a preparation process thereof. The dry-mixed
mortar comprises the following components: expanded and vitrified small balls,
cement and addictive, wherein the proportion ratio of the components is as follows by finished products / m<3>: 100-120kg of expanded and vitrified small balls, 140-160kg of
cement and 10-20kg of addictive. The preparation method comprises the following steps: weighting raw materials; subsequently, mixing in a mixing device by two steps: firstly, mixing the raw materials except the expanded and vitrified small balls, and then adding the expanded and vitrified small balls to continuously mix in a closed material
convective mixing region; and finally, measuring and packaging. The process of the invention is simple and can obtain the dry-mixed
mortar having obvious heat insulation effect, stable structure and
light quality, and the materials are evenly mixed; and the product has small coefficient of heat
conductivity, superior combination property and extremely high economic benefit and society benefit, meets the new development requirements of
building energy conversation, and is suitable for industrial popularization and application.