关键词: 戈壁地区, 混凝土强度, 养护方式, 回弹强度, 试块强度

Abstract: To obtain the variation law of the rebound strength of concrete pier and the strength of test block under different curing methods in Gobi region, we tested and analyzed the properties of the raw materials firstly. In subsequence, we tested the strength of concrete piers and test blocks cured by different methods (standard curing, air curing, geotextile maintenance, and rubber-plastic board maintenance) in Gobi region at different ages (3 d, 5 d, 7 d, 14 d, 28 d, and 56 d). Formula fitting and verification results of rebound strength and test block strength show that: (1) The compressive strength, tensile strength, and ratio of tensile strength to compressive strength increased gradually following the order of air curing, geotextile maintenance, rubber-plastic board maintenance, and standard curing. (2) The rebound strength of concrete pier under different curing conditions in Gobi region is smaller than the strength of test block, with the difference between 3-9 MPa, which reduces along with the increase of age. (3) When the thermal insulation effect of curing method improves, the difference between rebound strength and block strength of concrete in Gobi region shrinks. (4) The calculation formulae of concrete's rebound strength under different curing conditions in Gobi region and the strength of test block are proposed and verified to be of small error, hence could be used as reference for strength calculation.

Key words: Gobi region, concrete strength, curing method, rebound strength, block strength