利用真空飽水法確定粗集料密度
[Abstract]:At present, the density and water absorption test of coarse aggregate are carried out according to AASHTO T85 and ASTM C-127 standard. This method needs to soak the coarse aggregate sample for 15 h (AASHTO T85) and (24 鹵4) h (ASTM C-127), then dry the aggregate surface with dry water absorbent cloth to make it reach dry (SSD) state. The method is subjective in judging whether coarse aggregate meets SSD condition, and too long test time will bring inconvenience to construction quality control and quality monitoring (QC/QA). In this paper, a new vacuum saturated method is proposed to determine the density and water absorption of coarse aggregate. Under the pressure of 30mm mercury (4kPa), the crude aggregate was saturated in vacuum for 10 ~ 20 and 30 min, instead of the traditional immersion time of (24 鹵4) h. The vacuum saturated method for coarse aggregates is to remove all air entrained in the samples and to make water enter the effective pores of coarse aggregates. In this paper, various kinds of aggregates of different properties, including basalt, limestone and sand, are tested. The steel slag and comminuted concrete block are compared with the results obtained by AASHTO T 85. The results show that the measurement of coarse aggregate density under the condition of vacuum saturation of 10 ~ (20) and 30min can replace AASHTO T _ (85). At the same time, an important discovery has been made that AASHTO T85 has the problem of underestimating the water absorption of aggregates compared with the vacuum saturated water method.
【作者單位】: 長(zhǎng)安大學(xué)交通鋪面材料教育部工程研究中心;陜西中霖建設(shè)工程集團(tuán)有限公司;西安科技大學(xué)建筑與土木工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):52108047,52108048) 中國(guó)博士后科學(xué)基金項(xiàng)目(編號(hào):2013M532005) 河南省交通運(yùn)輸廳科技計(jì)劃項(xiàng)目(編號(hào):2012P35) 河北省交通運(yùn)輸廳科技計(jì)劃項(xiàng)目(編號(hào):Y-2011004,Y-2011005)
【分類(lèi)號(hào)】:U414
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