標題: 含貝殼海砂混凝土工程性質研究
The Effects of Sea-Shell in Concrete Aggregate
作者: 陳盛旺
Sheng-Wang Chen
郭一羽
Yi-Yu Kuo
土木工程學系
關鍵字: 扁平貝殼,圓形貝殼,貝殼含量;Flat Shell,Cycloid Shell,Shell Content
公開日期: 1994
摘要: 為探討海砂做為混凝土細骨材使用之可行性,本研究將含有貝殼之海砂做
為研究對象,探討台灣西海岸及澎湖地區海砂骨材中,含有不同數量及形
狀的貝殼,對混凝土工程性質的影響。研究中海砂骨材採取五種貝殼含量
、兩種貝殼形狀,配比設計採兩種坍度、四種水灰比的條件下,探討各種
含貝殼海砂混凝土的工程性質,其中包括工作度、抗壓強度、抗拉強度、
耐久性、透水性、凝結、乾縮等。並依試驗結果來評估海砂中貝殼形狀及
貝殼含量,是否會對混凝土工程性質造成不良的影響。研究結果顯示海砂
中貝殼含量增加會提高海砂細度模數,且降低海砂混凝土乾縮量,對抗壓
強度沒有不良影響,但是對混凝土耐久性會有不良影響。以貝殼形狀而言
,扁平貝殼對海砂混凝土之工作性與擴散係數均會產生不良影響;圓形貝
殼對提昇海砂混凝土之工作性與抗壓強度均有幫助。扁平貝殼用水量及乾
縮量較圓形為大,但其抗拉強度較圓形貝殼高。評估結果認為海砂中圓形
貝殼含量越多,配比設計較具經濟性。 而海砂混凝土與河砂混凝土比較
, 海砂中含圓形貝殼60﹪以上,配比用水量比河砂少,但海砂之抗拉強
度及耐久性較河砂差。
In order to conform the usability of offshore sand for
concrete aggregate , the effects of sea-shells in marine
aggregate will be studied . Five different shell contains
amount and two different shapes of sea-shells will be
discussed . Under the conditions of two slump and four
water-cement ratio , some fresh and hardened concrete
properties will be investigated . The properties include
workability , settling , compressive strength , shrinkage ,
durability etc . Based on the test results , we expect that
the permissible amount and shape or size of sea-shells in
fine aggregate can be determined . Form the studies , it shows
that increasing contents of shell will increase fineness
modulus , improve compressive strength and dry shrinkage of
concrete , but have loss of durability . For shell shape
, flat shell reduce the workability and increas cofficient
of diffusion , but have the advantage of splitting tensile
strength . Cycloid shell will be advantage of workability ,
compressive strength and reduce cofficient of diffusion of
offshore sand concrete . Flat shell need more water and have
more dry shrinkage than cycloid shell . That of using more
cycloid shell will get an economic concrete mixing
proportioning .
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT830015061
http://hdl.handle.net/11536/58755
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