【摘要】：為模擬濕態(tài)混凝土所處的短期水環(huán)境工作狀態(tài),將100 mm×100 mm×100 mm立方體混凝土試件浸于水中,通過浸水時(shí)間長短得到不同含水率后,進(jìn)行試件軸心抗壓試驗(yàn)。試驗(yàn)以不同配合比、含水率、養(yǎng)護(hù)時(shí)間為自變量,采用正交試驗(yàn)設(shè)計(jì)方法,重點(diǎn)研究了C30混凝土在不同齡期、不同含水率下的抗壓性能。結(jié)果表明:含水率隨浸水時(shí)間延長而增大,并趨于穩(wěn)定;相同配合比及浸水時(shí)間下,隨著養(yǎng)護(hù)時(shí)間的增長,混凝土的吸水量逐漸減少�；炷翗O限抗壓強(qiáng)度與含水率的變化規(guī)律因齡期的不同而存在差異。早期混凝土強(qiáng)度隨含水率增長而增加;但含水率對28 d齡期強(qiáng)度影響不大,略有增加;40 d齡期時(shí),含水率對極限強(qiáng)度呈現(xiàn)一定的"削弱"作用。
[Abstract]:In order to simulate the short term water environment of wet concrete, the specimens of 100 mm 脳 100 mm cubic concrete were immersed in water. The axial compression tests of the specimens were carried out after the different moisture content was obtained by immersion time. With different mix ratio, moisture content and curing time as independent variables, the compressive performance of C30 concrete under different age and moisture content was studied by orthogonal design method. The results show that the moisture content increases with the increase of soaking time and tends to be stable, and the water absorption of concrete decreases with the increase of curing time at the same mixing ratio and soaking time. The variation of ultimate compressive strength and moisture content of concrete varies with age. The strength of early concrete increases with the increase of moisture content, but the water content has little effect on the strength of 28 days old, and the water content has a certain "weakening" effect on the ultimate strength of concrete at 40 days of age.
【作者單位】： 湖北工業(yè)大學(xué)土木工程與建筑學(xué)院;武漢理工大學(xué)理學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51378182)
【分類號】：TU528

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