人民长江
人民長江
인민장강
YANGTZE RIVER
2015年
8期
47-49
,共3页
机制砂%取代率%力学性能%弹性模量%孔隙结构
機製砂%取代率%力學性能%彈性模量%孔隙結構
궤제사%취대솔%역학성능%탄성모량%공극결구
manufactured - sand%replacement ratio%mechanical property%elastic modulus%pore structure
为解决工程建设中天然砂资源日益短缺的难题，研究了相同配合比下，不同机制砂取代率对混凝土的力学特征、静压弹性模量、抗氯离子渗透等性能的影响，并对比分析了最佳机制砂取代率下混凝土和天然砂混凝土的抗冻性、收缩性及孔隙结构。结果表明：随着机制砂取代率的增大，试样的坍落度、氯离子渗透系数呈降低趋势，抗压强度、静压弹性模量呈先上升后降低趋势，并在取代率为40％左右时达到较佳状态；与天然砂混凝土相比，机制砂取代率为40％的混凝土其抗冻性、收缩性能均好于天然砂混凝土，且其内部孔径向着小孔径方向移动，平均孔径及孔隙率均降低，混凝土密实度得以提高。
為解決工程建設中天然砂資源日益短缺的難題，研究瞭相同配閤比下，不同機製砂取代率對混凝土的力學特徵、靜壓彈性模量、抗氯離子滲透等性能的影響，併對比分析瞭最佳機製砂取代率下混凝土和天然砂混凝土的抗凍性、收縮性及孔隙結構。結果錶明：隨著機製砂取代率的增大，試樣的坍落度、氯離子滲透繫數呈降低趨勢，抗壓彊度、靜壓彈性模量呈先上升後降低趨勢，併在取代率為40％左右時達到較佳狀態；與天然砂混凝土相比，機製砂取代率為40％的混凝土其抗凍性、收縮性能均好于天然砂混凝土，且其內部孔徑嚮著小孔徑方嚮移動，平均孔徑及孔隙率均降低，混凝土密實度得以提高。
위해결공정건설중천연사자원일익단결적난제，연구료상동배합비하，불동궤제사취대솔대혼응토적역학특정、정압탄성모량、항록리자삼투등성능적영향，병대비분석료최가궤제사취대솔하혼응토화천연사혼응토적항동성、수축성급공극결구。결과표명：수착궤제사취대솔적증대，시양적담락도、록리자삼투계수정강저추세，항압강도、정압탄성모량정선상승후강저추세，병재취대솔위40％좌우시체도교가상태；여천연사혼응토상비，궤제사취대솔위40％적혼응토기항동성、수축성능균호우천연사혼응토，차기내부공경향착소공경방향이동，평균공경급공극솔균강저，혼응토밀실도득이제고。
In order to solve the shortage of natural sand in engineering construction,the influence of different replacement rati-os of manufactured - sand on mechanical characteristics,static modulus of elasticity and resistance to chloride ion permeation of concrete were explored. Moreover the frost resistance,shrinkage and pore structure of optimal manufactured - sand concrete and normal concrete were compared. The test results show that with the increasing of manufactured - sand replacement ratio,the slump,chloride ion permeation coefficient shows a decreasing trend,and the compressive strength,static modulus of elasticity in-crease first and then decrease;the best replacement ratio is 40% . Compared with the natural - sand concrete,the frost resistance and shrinkage of concrete with a manufactured - sand replacement ratio of 40% is better,and the internal - aperture moves to-ward the small aperture,both the average pore diameter and porosity decrease,and the dense degree of concrete is improved.
