INVESTIGATION INTO THE EFFECTS OF TEMPERATURE ON STRENGTH CHARACTERISTICS OF CONCRETE PRODUCED IN ANAMBRA STATE

C B Bert-Okonkwor, K C Okoli, M I Okongwu, Oluchukwu Precious-Favour Nzeneri

Abstract


The study investigated the effects of temperature on strength of concrete produced in Anambra State, Nigeria. The study is an experimental research. Concrete were produced at different temperature within the study area. Cement, aggregates (fine and coarse) and water were used in mixing concrete. Dangote Cement was used for all the concrete produced. The fine aggregates used was obtained from River Sand (Onitsha), coarse aggregate is crushed stones from Nkwelle Ezunaka and water used for the concrete mixing is fit for drinking. These concrete produced were tested in the laboratory (Anambra State Material Testing Laboratory) for workability and compressive strength and the result obtained were presented in simple tables and graphs. The study found out that there is great variation in strength of concrete produced at different temperatures. The average compressive strength at 27.60C is 14.83N/mm2. At temperatures above 300C, the strength of concrete tends to diminish/reduce. Compressive strength of concrete at 33.850C and 35.10C was 11.6N/mm2 and 11.1N/mm2 respectively. Also, the result of the slump value ranges from 48.4mm – 103.5mm (indicating that all the concrete mix is workable). The graph in Figure 3 indicates that concrete produced in early hours of the day yielded the highest compressive strength (28th day) while as temperature increases, the compressive strength of concrete diminishes. The study was concluded by recommending that the best time for concrete production is in the morning when atmospheric temperature is still below 300C within the study area. From the results of the study, it can be clearly noticed that with increase in temperature, there is there is significant increase slump of concrete mix as well as decrease in crushing load and compressive strength of concrete.


Keywords: Concrete, Cement, Temperature, Compressive Strength.


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