碱激发矿渣陶粒混凝土砌块高温后力学性能

Mechanical properties of alkali-activated slag ceramsite concrete block after exposure to high temperature

为研究碱激发矿渣陶粒混凝土砌块高温后力学性能,完成了MU10和MU20两个强度等级常温下及历经400、600、700、800、900、1 000、1 100℃高温后各24个碱激发矿渣陶粒混凝土砌块抗压试验.发现MU10和MU20砌块高温后抗压强度在20～1 100℃间随历经温度的升高而线性降低.基于试验结果,建立了高温后碱激发矿渣陶粒混凝土砌块抗压强度随历经温度而变化的计算公式.

To investigate the mechanical properties of alkali-activated slag ceramsite concrete blocks after exposure to high temperature, compression tests were conducted on 48 alkali-activated slag ceramsite concrete blocks with two strength grades, MU10 and MU20, and all the specimens were exposed to normal temperature and a temperature history of 400 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1 000 ℃, and 1 100 ℃. The results show that the compressive strengths of MU10 and MU20 ceramsite concrete blocks exhibited a linear decrease with the increase of the heating temperature from 20 ℃ to 1 100 ℃. Based on the test results, the formulas were constructed to calculate the compressive strengths of the alkali-activated slag ceramsite concrete blocks after exposure to high temperature in term of the heating temperatures.