在水泥胶砂中掺入适当配比的煤矸石可以增加水泥砂浆的强度,尤其是早期强度.与不添加煤矸石的基准砂浆相比,煤矸石的掺量为9%时,砂浆3 d抗压强度提高1.0 MPa,28 d抗压强度提高2.0 MPa.XRD、TGA-DTA和SEM分析证实:加入煤矸石促进了水泥砂浆7 d早期水化反应,生成水化产物钙矾石、C-S-H凝胶、AFm和氢氧化钙,且水化产物的数量亦不同,各产物的晶型结构也不相同,改性后水化产物增多,水化速率加快,因而影响砂浆的宏观力学强度.
The addition of suitable amount of coal gangue to cement mortar may increase cement mortar strength. When the content of coal gangue is 9%, the compressive strengths at 3 and 28 d increased 1.0 MPa and 2.0 MPa, respectively. The analysis by XRD, TGA-DTA and SEM showed that the addition of coal gangue prompted the hydration reaction at early stage of 7 days. The hydration products are AFt, C-S-H, AFm and Ca(OH)_2. These hydration products and crystal structures are different. After modification, hydration products increased and the hydration speed was quickened. As a result, the cement mortar strength increased.
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